/* * MPEG-1/2 decoder * Copyright (c) 2000, 2001 Fabrice Bellard * Copyright (c) 2002-2004 Michael Niedermayer * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * MPEG-1/2 decoder */ #include #include "libavutil/attributes.h" #include "libavutil/internal.h" #include "libavutil/stereo3d.h" #include "avcodec.h" #include "bytestream.h" #include "error_resilience.h" #include "idctdsp.h" #include "internal.h" #include "mpeg_er.h" #include "mpeg12.h" #include "mpeg12data.h" #include "mpegutils.h" #include "mpegvideo.h" #include "thread.h" #include "version.h" #include "xvmc_internal.h" typedef struct Mpeg1Context { MpegEncContext mpeg_enc_ctx; int mpeg_enc_ctx_allocated; /* true if decoding context allocated */ int repeat_field; /* true if we must repeat the field */ AVPanScan pan_scan; /* some temporary storage for the panscan */ AVStereo3D stereo3d; int has_stereo3d; uint8_t *a53_caption; int a53_caption_size; uint8_t afd; int has_afd; int slice_count; int save_aspect_info; int save_width, save_height, save_progressive_seq; AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */ int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */ int closed_gop; /* GOP is closed */ int first_slice; int extradata_decoded; } Mpeg1Context; #define MB_TYPE_ZERO_MV 0x20000000 static const uint32_t ptype2mb_type[7] = { MB_TYPE_INTRA, MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16, MB_TYPE_L0, MB_TYPE_L0 | MB_TYPE_CBP, MB_TYPE_QUANT | MB_TYPE_INTRA, MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16, MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP, }; static const uint32_t btype2mb_type[11] = { MB_TYPE_INTRA, MB_TYPE_L1, MB_TYPE_L1 | MB_TYPE_CBP, MB_TYPE_L0, MB_TYPE_L0 | MB_TYPE_CBP, MB_TYPE_L0L1, MB_TYPE_L0L1 | MB_TYPE_CBP, MB_TYPE_QUANT | MB_TYPE_INTRA, MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP, MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP, MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP, }; static const uint8_t non_linear_qscale[32] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 32, 36, 40, 44, 48, 52, 56, 64, 72, 80, 88, 96, 104, 112, }; /* as H.263, but only 17 codes */ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred) { int code, sign, val, shift; code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2); if (code == 0) return pred; if (code < 0) return 0xffff; sign = get_bits1(&s->gb); shift = fcode - 1; val = code; if (shift) { val = (val - 1) << shift; val |= get_bits(&s->gb, shift); val++; } if (sign) val = -val; val += pred; /* modulo decoding */ return sign_extend(val, 5 + shift); } #define check_scantable_index(ctx, x) \ do { \ if ((x) > 63) { \ av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \ ctx->mb_x, ctx->mb_y); \ return AVERROR_INVALIDDATA; \ } \ } while (0) static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n) { int level, dc, diff, i, j, run; int component; RLTable *rl = &ff_rl_mpeg1; uint8_t *const scantable = s->intra_scantable.permutated; const uint16_t *quant_matrix = s->intra_matrix; const int qscale = s->qscale; /* DC coefficient */ component = (n <= 3 ? 0 : n - 4 + 1); diff = decode_dc(&s->gb, component); if (diff >= 0xffff) return AVERROR_INVALIDDATA; dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; block[0] = dc * quant_matrix[0]; ff_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff); i = 0; { OPEN_READER(re, &s->gb); /* now quantify & encode AC coefficients */ for (;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if (level == 127) { break; } else if (level != 0) { i += run; check_scantable_index(s, i); j = scantable[i]; level = (level * qscale * quant_matrix[j]) >> 4; level = (level - 1) | 1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); if (level == -128) { level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8); } else if (level == 0) { level = SHOW_UBITS(re, &s->gb, 8); LAST_SKIP_BITS(re, &s->gb, 8); } i += run; check_scantable_index(s, i); j = scantable[i]; if (level < 0) { level = -level; level = (level * qscale * quant_matrix[j]) >> 4; level = (level - 1) | 1; level = -level; } else { level = (level * qscale * quant_matrix[j]) >> 4; level = (level - 1) | 1; } } block[j] = level; } CLOSE_READER(re, &s->gb); } s->block_last_index[n] = i; return 0; } int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n) { return mpeg1_decode_block_intra(s, block, n); } static inline int mpeg1_decode_block_inter(MpegEncContext *s, int16_t *block, int n) { int level, i, j, run; RLTable *rl = &ff_rl_mpeg1; uint8_t *const scantable = s->intra_scantable.permutated; const uint16_t *quant_matrix = s->inter_matrix; const int qscale = s->qscale; { OPEN_READER(re, &s->gb); i = -1; // special case for first coefficient, no need to add second VLC table UPDATE_CACHE(re, &s->gb); if (((int32_t) GET_CACHE(re, &s->gb)) < 0) { level = (3 * qscale * quant_matrix[0]) >> 5; level = (level - 1) | 1; if (GET_CACHE(re, &s->gb) & 0x40000000) level = -level; block[0] = level; i++; SKIP_BITS(re, &s->gb, 2); if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) goto end; } /* now quantify & encode AC coefficients */ for (;;) { GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if (level != 0) { i += run; check_scantable_index(s, i); j = scantable[i]; level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = (level - 1) | 1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); if (level == -128) { level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8); } else if (level == 0) { level = SHOW_UBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); } i += run; check_scantable_index(s, i); j = scantable[i]; if (level < 0) { level = -level; level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = (level - 1) | 1; level = -level; } else { level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = (level - 1) | 1; } } block[j] = level; if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); } s->block_last_index[n] = i; return 0; } static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, int16_t *block, int n) { int level, i, j, run; RLTable *rl = &ff_rl_mpeg1; uint8_t *const scantable = s->intra_scantable.permutated; const int qscale = s->qscale; { OPEN_READER(re, &s->gb); i = -1; // Special case for first coefficient, no need to add second VLC table. UPDATE_CACHE(re, &s->gb); if (((int32_t) GET_CACHE(re, &s->gb)) < 0) { level = (3 * qscale) >> 1; level = (level - 1) | 1; if (GET_CACHE(re, &s->gb) & 0x40000000) level = -level; block[0] = level; i++; SKIP_BITS(re, &s->gb, 2); if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) goto end; } /* now quantify & encode AC coefficients */ for (;;) { GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if (level != 0) { i += run; check_scantable_index(s, i); j = scantable[i]; level = ((level * 2 + 1) * qscale) >> 1; level = (level - 1) | 1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); if (level == -128) { level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8); } else if (level == 0) { level = SHOW_UBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); } i += run; check_scantable_index(s, i); j = scantable[i]; if (level < 0) { level = -level; level = ((level * 2 + 1) * qscale) >> 1; level = (level - 1) | 1; level = -level; } else { level = ((level * 2 + 1) * qscale) >> 1; level = (level - 1) | 1; } } block[j] = level; if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); } s->block_last_index[n] = i; return 0; } static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n) { int level, i, j, run; RLTable *rl = &ff_rl_mpeg1; uint8_t *const scantable = s->intra_scantable.permutated; const uint16_t *quant_matrix; const int qscale = s->qscale; int mismatch; mismatch = 1; { OPEN_READER(re, &s->gb); i = -1; if (n < 4) quant_matrix = s->inter_matrix; else quant_matrix = s->chroma_inter_matrix; // Special case for first coefficient, no need to add second VLC table. UPDATE_CACHE(re, &s->gb); if (((int32_t) GET_CACHE(re, &s->gb)) < 0) { level = (3 * qscale * quant_matrix[0]) >> 5; if (GET_CACHE(re, &s->gb) & 0x40000000) level = -level; block[0] = level; mismatch ^= level; i++; SKIP_BITS(re, &s->gb, 2); if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) goto end; } /* now quantify & encode AC coefficients */ for (;;) { GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if (level != 0) { i += run; check_scantable_index(s, i); j = scantable[i]; level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); i += run; check_scantable_index(s, i); j = scantable[i]; if (level < 0) { level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5; level = -level; } else { level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5; } } mismatch ^= level; block[j] = level; if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); } block[63] ^= (mismatch & 1); s->block_last_index[n] = i; return 0; } static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, int16_t *block, int n) { int level, i, j, run; RLTable *rl = &ff_rl_mpeg1; uint8_t *const scantable = s->intra_scantable.permutated; const int qscale = s->qscale; OPEN_READER(re, &s->gb); i = -1; // special case for first coefficient, no need to add second VLC table UPDATE_CACHE(re, &s->gb); if (((int32_t) GET_CACHE(re, &s->gb)) < 0) { level = (3 * qscale) >> 1; if (GET_CACHE(re, &s->gb) & 0x40000000) level = -level; block[0] = level; i++; SKIP_BITS(re, &s->gb, 2); if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) goto end; } /* now quantify & encode AC coefficients */ for (;;) { GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if (level != 0) { i += run; check_scantable_index(s, i); j = scantable[i]; level = ((level * 2 + 1) * qscale) >> 1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); i += run; check_scantable_index(s, i); j = scantable[i]; if (level < 0) { level = ((-level * 2 + 1) * qscale) >> 1; level = -level; } else { level = ((level * 2 + 1) * qscale) >> 1; } } block[j] = level; if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); s->block_last_index[n] = i; return 0; } static inline int mpeg2_decode_block_intra(MpegEncContext *s, int16_t *block, int n) { int level, dc, diff, i, j, run; int component; RLTable *rl; uint8_t *const scantable = s->intra_scantable.permutated; const uint16_t *quant_matrix; const int qscale = s->qscale; int mismatch; /* DC coefficient */ if (n < 4) { quant_matrix = s->intra_matrix; component = 0; } else { quant_matrix = s->chroma_intra_matrix; component = (n & 1) + 1; } diff = decode_dc(&s->gb, component); if (diff >= 0xffff) return AVERROR_INVALIDDATA; dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; block[0] = dc << (3 - s->intra_dc_precision); ff_dlog(s->avctx, "dc=%d\n", block[0]); mismatch = block[0] ^ 1; i = 0; if (s->intra_vlc_format) rl = &ff_rl_mpeg2; else rl = &ff_rl_mpeg1; { OPEN_READER(re, &s->gb); /* now quantify & encode AC coefficients */ for (;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if (level == 127) { break; } else if (level != 0) { i += run; check_scantable_index(s, i); j = scantable[i]; level = (level * qscale * quant_matrix[j]) >> 4; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); i += run; check_scantable_index(s, i); j = scantable[i]; if (level < 0) { level = (-level * qscale * quant_matrix[j]) >> 4; level = -level; } else { level = (level * qscale * quant_matrix[j]) >> 4; } } mismatch ^= level; block[j] = level; } CLOSE_READER(re, &s->gb); } block[63] ^= mismatch & 1; s->block_last_index[n] = i; return 0; } static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, int16_t *block, int n) { int level, dc, diff, i, j, run; int component; RLTable *rl; uint8_t *const scantable = s->intra_scantable.permutated; const uint16_t *quant_matrix; const int qscale = s->qscale; /* DC coefficient */ if (n < 4) { quant_matrix = s->intra_matrix; component = 0; } else { quant_matrix = s->chroma_intra_matrix; component = (n & 1) + 1; } diff = decode_dc(&s->gb, component); if (diff >= 0xffff) return AVERROR_INVALIDDATA; dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; block[0] = dc << (3 - s->intra_dc_precision); i = 0; if (s->intra_vlc_format) rl = &ff_rl_mpeg2; else rl = &ff_rl_mpeg1; { OPEN_READER(re, &s->gb); /* now quantify & encode AC coefficients */ for (;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if (level == 127) { break; } else if (level != 0) { i += run; check_scantable_index(s, i); j = scantable[i]; level = (level * qscale * quant_matrix[j]) >> 4; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6) + 1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); i += run; check_scantable_index(s, i); j = scantable[i]; if (level < 0) { level = (-level * qscale * quant_matrix[j]) >> 4; level = -level; } else { level = (level * qscale * quant_matrix[j]) >> 4; } } block[j] = level; } CLOSE_READER(re, &s->gb); } s->block_last_index[n] = i; return 0; } /******************************************/ /* decoding */ static inline int get_dmv(MpegEncContext *s) { if (get_bits1(&s->gb)) return 1 - (get_bits1(&s->gb) << 1); else return 0; } static inline int get_qscale(MpegEncContext *s) { int qscale = get_bits(&s->gb, 5); if (s->q_scale_type) return non_linear_qscale[qscale]; else return qscale << 1; } /* motion type (for MPEG-2) */ #define MT_FIELD 1 #define MT_FRAME 2 #define MT_16X8 2 #define MT_DMV 3 static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64]) { int i, j, k, cbp, val, mb_type, motion_type; const int mb_block_count = 4 + (1 << s->chroma_format); int ret; ff_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y); assert(s->mb_skipped == 0); if (s->mb_skip_run-- != 0) { if (s->pict_type == AV_PICTURE_TYPE_P) { s->mb_skipped = 1; s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16; } else { int mb_type; if (s->mb_x) mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1]; else // FIXME not sure if this is allowed in MPEG at all mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; if (IS_INTRA(mb_type)) return AVERROR_INVALIDDATA; s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type | MB_TYPE_SKIP; // assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8)); if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0) s->mb_skipped = 1; } return 0; } switch (s->pict_type) { default: case AV_PICTURE_TYPE_I: if (get_bits1(&s->gb) == 0) { if (get_bits1(&s->gb) == 0) { av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA; } else { mb_type = MB_TYPE_INTRA; } break; case AV_PICTURE_TYPE_P: mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1); if (mb_type < 0) { av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } mb_type = ptype2mb_type[mb_type]; break; case AV_PICTURE_TYPE_B: mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1); if (mb_type < 0) { av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } mb_type = btype2mb_type[mb_type]; break; } ff_dlog(s->avctx, "mb_type=%x\n", mb_type); // motion_type = 0; /* avoid warning */ if (IS_INTRA(mb_type)) { s->bdsp.clear_blocks(s->block[0]); if (!s->chroma_y_shift) s->bdsp.clear_blocks(s->block[6]); /* compute DCT type */ // FIXME: add an interlaced_dct coded var? if (s->picture_structure == PICT_FRAME && !s->frame_pred_frame_dct) s->interlaced_dct = get_bits1(&s->gb); if (IS_QUANT(mb_type)) s->qscale = get_qscale(s); if (s->concealment_motion_vectors) { /* just parse them */ if (s->picture_structure != PICT_FRAME) skip_bits1(&s->gb); /* field select */ s->mv[0][0][0] = s->last_mv[0][0][0] = s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]); s->mv[0][0][1] = s->last_mv[0][0][1] = s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]); skip_bits1(&s->gb); /* marker */ } else { /* reset mv prediction */ memset(s->last_mv, 0, sizeof(s->last_mv)); } s->mb_intra = 1; #if FF_API_XVMC FF_DISABLE_DEPRECATION_WARNINGS // if 1, we memcpy blocks in xvmcvideo if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks FF_ENABLE_DEPRECATION_WARNINGS #endif /* FF_API_XVMC */ if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) { if (s->avctx->flags2 & CODEC_FLAG2_FAST) { for (i = 0; i < 6; i++) mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i); } else { for (i = 0; i < mb_block_count; i++) if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0) return ret; } } else { for (i = 0; i < 6; i++) if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0) return ret; } } else { if (mb_type & MB_TYPE_ZERO_MV) { assert(mb_type & MB_TYPE_CBP); s->mv_dir = MV_DIR_FORWARD; if (s->picture_structure == PICT_FRAME) { if (!s->frame_pred_frame_dct) s->interlaced_dct = get_bits1(&s->gb); s->mv_type = MV_TYPE_16X16; } else { s->mv_type = MV_TYPE_FIELD; mb_type |= MB_TYPE_INTERLACED; s->field_select[0][0] = s->picture_structure - 1; } if (IS_QUANT(mb_type)) s->qscale = get_qscale(s); s->last_mv[0][0][0] = 0; s->last_mv[0][0][1] = 0; s->last_mv[0][1][0] = 0; s->last_mv[0][1][1] = 0; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; } else { assert(mb_type & MB_TYPE_L0L1); // FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED /* get additional motion vector type */ if (s->frame_pred_frame_dct) { motion_type = MT_FRAME; } else { motion_type = get_bits(&s->gb, 2); if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type)) s->interlaced_dct = get_bits1(&s->gb); } if (IS_QUANT(mb_type)) s->qscale = get_qscale(s); /* motion vectors */ s->mv_dir = (mb_type >> 13) & 3; ff_dlog(s->avctx, "motion_type=%d\n", motion_type); switch (motion_type) { case MT_FRAME: /* or MT_16X8 */ if (s->picture_structure == PICT_FRAME) { mb_type |= MB_TYPE_16x16; s->mv_type = MV_TYPE_16X16; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { /* MT_FRAME */ s->mv[i][0][0] = s->last_mv[i][0][0] = s->last_mv[i][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]); s->mv[i][0][1] = s->last_mv[i][0][1] = s->last_mv[i][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]); /* full_pel: only for MPEG-1 */ if (s->full_pel[i]) { s->mv[i][0][0] <<= 1; s->mv[i][0][1] <<= 1; } } } } else { mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; s->mv_type = MV_TYPE_16X8; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { /* MT_16X8 */ for (j = 0; j < 2; j++) { s->field_select[i][j] = get_bits1(&s->gb); for (k = 0; k < 2; k++) { val = mpeg_decode_motion(s, s->mpeg_f_code[i][k], s->last_mv[i][j][k]); s->last_mv[i][j][k] = val; s->mv[i][j][k] = val; } } } } } break; case MT_FIELD: s->mv_type = MV_TYPE_FIELD; if (s->picture_structure == PICT_FRAME) { mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { for (j = 0; j < 2; j++) { s->field_select[i][j] = get_bits1(&s->gb); val = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][j][0]); s->last_mv[i][j][0] = val; s->mv[i][j][0] = val; ff_dlog(s->avctx, "fmx=%d\n", val); val = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][j][1] >> 1); s->last_mv[i][j][1] = val << 1; s->mv[i][j][1] = val; ff_dlog(s->avctx, "fmy=%d\n", val); } } } } else { mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { s->field_select[i][0] = get_bits1(&s->gb); for (k = 0; k < 2; k++) { val = mpeg_decode_motion(s, s->mpeg_f_code[i][k], s->last_mv[i][0][k]); s->last_mv[i][0][k] = val; s->last_mv[i][1][k] = val; s->mv[i][0][k] = val; } } } } break; case MT_DMV: s->mv_type = MV_TYPE_DMV; for (i = 0; i < 2; i++) { if (USES_LIST(mb_type, i)) { int dmx, dmy, mx, my, m; const int my_shift = s->picture_structure == PICT_FRAME; mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]); s->last_mv[i][0][0] = mx; s->last_mv[i][1][0] = mx; dmx = get_dmv(s); my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1] >> my_shift); dmy = get_dmv(s); s->last_mv[i][0][1] = my << my_shift; s->last_mv[i][1][1] = my << my_shift; s->mv[i][0][0] = mx; s->mv[i][0][1] = my; s->mv[i][1][0] = mx; // not used s->mv[i][1][1] = my; // not used if (s->picture_structure == PICT_FRAME) { mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; // m = 1 + 2 * s->top_field_first; m = s->top_field_first ? 1 : 3; /* top -> top pred */ s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx; s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1; m = 4 - m; s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx; s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1; } else { mb_type |= MB_TYPE_16x16; s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx; s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy; if (s->picture_structure == PICT_TOP_FIELD) s->mv[i][2][1]--; else s->mv[i][2][1]++; } } } break; default: av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } } s->mb_intra = 0; if (HAS_CBP(mb_type)) { s->bdsp.clear_blocks(s->block[0]); cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1); if (mb_block_count > 6) { cbp <<= mb_block_count - 6; cbp |= get_bits(&s->gb, mb_block_count - 6); s->bdsp.clear_blocks(s->block[6]); } if (cbp <= 0) { av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } #if FF_API_XVMC FF_DISABLE_DEPRECATION_WARNINGS // if 1, we memcpy blocks in xvmcvideo if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) ff_xvmc_pack_pblocks(s, cbp); FF_ENABLE_DEPRECATION_WARNINGS #endif /* FF_API_XVMC */ if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) { if (s->avctx->flags2 & CODEC_FLAG2_FAST) { for (i = 0; i < 6; i++) { if (cbp & 32) mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i); else s->block_last_index[i] = -1; cbp += cbp; } } else { cbp <<= 12 - mb_block_count; for (i = 0; i < mb_block_count; i++) { if (cbp & (1 << 11)) { if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0) return ret; } else { s->block_last_index[i] = -1; } cbp += cbp; } } } else { if (s->avctx->flags2 & CODEC_FLAG2_FAST) { for (i = 0; i < 6; i++) { if (cbp & 32) mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i); else s->block_last_index[i] = -1; cbp += cbp; } } else { for (i = 0; i < 6; i++) { if (cbp & 32) { if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0) return ret; } else { s->block_last_index[i] = -1; } cbp += cbp; } } } } else { for (i = 0; i < 12; i++) s->block_last_index[i] = -1; } } s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type; return 0; } static av_cold int mpeg_decode_init(AVCodecContext *avctx) { Mpeg1Context *s = avctx->priv_data; MpegEncContext *s2 = &s->mpeg_enc_ctx; ff_mpv_decode_defaults(s2); s->mpeg_enc_ctx.avctx = avctx; /* we need some permutation to store matrices, * until the decoder sets the real permutation. */ ff_mpv_idct_init(s2); ff_mpeg12_common_init(&s->mpeg_enc_ctx); ff_mpeg12_init_vlcs(); s->mpeg_enc_ctx_allocated = 0; s->mpeg_enc_ctx.picture_number = 0; s->repeat_field = 0; s->mpeg_enc_ctx.codec_id = avctx->codec->id; avctx->color_range = AVCOL_RANGE_MPEG; if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO) avctx->chroma_sample_location = AVCHROMA_LOC_CENTER; else avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; return 0; } static int mpeg_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from) { Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data; MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx; int err; if (avctx == avctx_from || !ctx_from->mpeg_enc_ctx_allocated || !s1->context_initialized) return 0; err = ff_mpeg_update_thread_context(avctx, avctx_from); if (err) return err; if (!ctx->mpeg_enc_ctx_allocated) { // copy the whole context after the initial MpegEncContext structure memcpy(ctx, ctx_from, sizeof(*ctx)); memset(&ctx->mpeg_enc_ctx, 0, sizeof(ctx->mpeg_enc_ctx)); } if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)) s->picture_number++; return 0; } static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, const uint8_t *new_perm) { uint16_t temp_matrix[64]; int i; memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t)); for (i = 0; i < 64; i++) matrix[new_perm[i]] = temp_matrix[old_perm[i]]; } #if FF_API_XVMC static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = { AV_PIX_FMT_XVMC_MPEG2_IDCT, AV_PIX_FMT_XVMC_MPEG2_MC, AV_PIX_FMT_NONE }; #endif /* FF_API_XVMC */ static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = { #if CONFIG_MPEG2_DXVA2_HWACCEL AV_PIX_FMT_DXVA2_VLD, #endif #if CONFIG_MPEG2_D3D11VA_HWACCEL AV_PIX_FMT_D3D11VA_VLD, #endif #if CONFIG_MPEG2_VAAPI_HWACCEL AV_PIX_FMT_VAAPI_VLD, #endif #if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL AV_PIX_FMT_VDPAU, #endif AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE }; static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = { AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE }; static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_NONE }; static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; const enum AVPixelFormat *pix_fmts; #if FF_API_XVMC FF_DISABLE_DEPRECATION_WARNINGS if (avctx->xvmc_acceleration) return ff_get_format(avctx, pixfmt_xvmc_mpg2_420); FF_ENABLE_DEPRECATION_WARNINGS #endif /* FF_API_XVMC */ if (s->chroma_format < 2) pix_fmts = mpeg12_hwaccel_pixfmt_list_420; else if (s->chroma_format == 2) pix_fmts = mpeg12_pixfmt_list_422; else pix_fmts = mpeg12_pixfmt_list_444; return ff_get_format(avctx, pix_fmts); } /* Call this function when we know all parameters. * It may be called in different places for MPEG-1 and MPEG-2. */ static int mpeg_decode_postinit(AVCodecContext *avctx) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; uint8_t old_permutation[64]; int ret; if ((s1->mpeg_enc_ctx_allocated == 0) || avctx->coded_width != s->width || avctx->coded_height != s->height || s1->save_width != s->width || s1->save_height != s->height || s1->save_aspect_info != s->aspect_ratio_info || s1->save_progressive_seq != s->progressive_sequence || 0) { if (s1->mpeg_enc_ctx_allocated) { ParseContext pc = s->parse_context; s->parse_context.buffer = 0; ff_mpv_common_end(s); s->parse_context = pc; } ret = ff_set_dimensions(avctx, s->width, s->height); if (ret < 0) return ret; avctx->bit_rate = s->bit_rate; s1->save_aspect_info = s->aspect_ratio_info; s1->save_width = s->width; s1->save_height = s->height; s1->save_progressive_seq = s->progressive_sequence; /* low_delay may be forced, in this case we will have B-frames * that behave like P-frames. */ avctx->has_b_frames = !s->low_delay; if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) { // MPEG-1 fps avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index]; // MPEG-1 aspect avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255); avctx->ticks_per_frame = 1; } else { // MPEG-2 // MPEG-2 fps av_reduce(&s->avctx->framerate.num, &s->avctx->framerate.den, ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2, ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den, 1 << 30); avctx->ticks_per_frame = 2; // MPEG-2 aspect if (s->aspect_ratio_info > 1) { AVRational dar = av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info], (AVRational) { s1->pan_scan.width, s1->pan_scan.height }), (AVRational) { s->width, s->height }); /* We ignore the spec here and guess a bit as reality does not * match the spec, see for example res_change_ffmpeg_aspect.ts * and sequence-display-aspect.mpg. * issue1613, 621, 562 */ if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) || (av_cmp_q(dar, (AVRational) { 4, 3 }) && av_cmp_q(dar, (AVRational) { 16, 9 }))) { s->avctx->sample_aspect_ratio = av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info], (AVRational) { s->width, s->height }); } else { s->avctx->sample_aspect_ratio = av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info], (AVRational) { s1->pan_scan.width, s1->pan_scan.height }); // issue1613 4/3 16/9 -> 16/9 // res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3 // widescreen-issue562.mpg 4/3 16/9 -> 16/9 // s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height}); ff_dlog(avctx, "A %d/%d\n", ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den); ff_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num, s->avctx->sample_aspect_ratio.den); } } else { s->avctx->sample_aspect_ratio = ff_mpeg2_aspect[s->aspect_ratio_info]; } } // MPEG-2 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio); avctx->pix_fmt = mpeg_get_pixelformat(avctx); // until then pix_fmt may be changed right after codec init #if FF_API_XVMC if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO) #else if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO) #endif /* FF_API_XVMC */ avctx->idct_algo = FF_IDCT_SIMPLE; /* Quantization matrices may need reordering * if DCT permutation is changed. */ memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t)); ff_mpv_idct_init(s); if ((ret = ff_mpv_common_init(s)) < 0) return ret; quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation); quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation); quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation); quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation); s1->mpeg_enc_ctx_allocated = 1; } return 0; } static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int ref, f_code, vbv_delay; init_get_bits(&s->gb, buf, buf_size * 8); ref = get_bits(&s->gb, 10); /* temporal ref */ s->pict_type = get_bits(&s->gb, 3); if (s->pict_type == 0 || s->pict_type > 3) return AVERROR_INVALIDDATA; vbv_delay = get_bits(&s->gb, 16); if (s->pict_type == AV_PICTURE_TYPE_P || s->pict_type == AV_PICTURE_TYPE_B) { s->full_pel[0] = get_bits1(&s->gb); f_code = get_bits(&s->gb, 3); if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM)) return AVERROR_INVALIDDATA; s->mpeg_f_code[0][0] = f_code; s->mpeg_f_code[0][1] = f_code; } if (s->pict_type == AV_PICTURE_TYPE_B) { s->full_pel[1] = get_bits1(&s->gb); f_code = get_bits(&s->gb, 3); if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM)) return AVERROR_INVALIDDATA; s->mpeg_f_code[1][0] = f_code; s->mpeg_f_code[1][1] = f_code; } s->current_picture.f->pict_type = s->pict_type; s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I; if (avctx->debug & FF_DEBUG_PICT_INFO) av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type); s->y_dc_scale = 8; s->c_dc_scale = 8; return 0; } static void mpeg_decode_sequence_extension(Mpeg1Context *s1) { MpegEncContext *s = &s1->mpeg_enc_ctx; int horiz_size_ext, vert_size_ext; int bit_rate_ext; skip_bits(&s->gb, 1); /* profile and level esc*/ s->avctx->profile = get_bits(&s->gb, 3); s->avctx->level = get_bits(&s->gb, 4); s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */ s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */ horiz_size_ext = get_bits(&s->gb, 2); vert_size_ext = get_bits(&s->gb, 2); s->width |= (horiz_size_ext << 12); s->height |= (vert_size_ext << 12); bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */ s->bit_rate += (bit_rate_ext << 18) * 400; skip_bits1(&s->gb); /* marker */ s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10; s->low_delay = get_bits1(&s->gb); if (s->avctx->flags & CODEC_FLAG_LOW_DELAY) s->low_delay = 1; s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1; s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1; ff_dlog(s->avctx, "sequence extension\n"); s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%d\n", s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate); } static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1) { MpegEncContext *s = &s1->mpeg_enc_ctx; int color_description, w, h; skip_bits(&s->gb, 3); /* video format */ color_description = get_bits1(&s->gb); if (color_description) { s->avctx->color_primaries = get_bits(&s->gb, 8); s->avctx->color_trc = get_bits(&s->gb, 8); s->avctx->colorspace = get_bits(&s->gb, 8); } w = get_bits(&s->gb, 14); skip_bits(&s->gb, 1); // marker h = get_bits(&s->gb, 14); // remaining 3 bits are zero padding s1->pan_scan.width = 16 * w; s1->pan_scan.height = 16 * h; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h); } static void mpeg_decode_picture_display_extension(Mpeg1Context *s1) { MpegEncContext *s = &s1->mpeg_enc_ctx; int i, nofco; nofco = 1; if (s->progressive_sequence) { if (s->repeat_first_field) { nofco++; if (s->top_field_first) nofco++; } } else { if (s->picture_structure == PICT_FRAME) { nofco++; if (s->repeat_first_field) nofco++; } } for (i = 0; i < nofco; i++) { s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16); skip_bits(&s->gb, 1); // marker s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16); skip_bits(&s->gb, 1); // marker } if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n", s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]); } static int load_matrix(MpegEncContext *s, uint16_t matrix0[64], uint16_t matrix1[64], int intra) { int i; for (i = 0; i < 64; i++) { int j = s->idsp.idct_permutation[ff_zigzag_direct[i]]; int v = get_bits(&s->gb, 8); if (v == 0) { av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n"); return AVERROR_INVALIDDATA; } if (intra && i == 0 && v != 8) { av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n"); v = 8; // needed by pink.mpg / issue1046 } matrix0[j] = v; if (matrix1) matrix1[j] = v; } return 0; } static void mpeg_decode_quant_matrix_extension(MpegEncContext *s) { ff_dlog(s->avctx, "matrix extension\n"); if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1); if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0); if (get_bits1(&s->gb)) load_matrix(s, s->chroma_intra_matrix, NULL, 1); if (get_bits1(&s->gb)) load_matrix(s, s->chroma_inter_matrix, NULL, 0); } static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1) { MpegEncContext *s = &s1->mpeg_enc_ctx; s->full_pel[0] = s->full_pel[1] = 0; s->mpeg_f_code[0][0] = get_bits(&s->gb, 4); s->mpeg_f_code[0][1] = get_bits(&s->gb, 4); s->mpeg_f_code[1][0] = get_bits(&s->gb, 4); s->mpeg_f_code[1][1] = get_bits(&s->gb, 4); if (!s->pict_type && s1->mpeg_enc_ctx_allocated) { av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code, guessing missing values\n"); if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) { if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15) s->pict_type = AV_PICTURE_TYPE_I; else s->pict_type = AV_PICTURE_TYPE_P; } else s->pict_type = AV_PICTURE_TYPE_B; s->current_picture.f->pict_type = s->pict_type; s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I; } s->intra_dc_precision = get_bits(&s->gb, 2); s->picture_structure = get_bits(&s->gb, 2); s->top_field_first = get_bits1(&s->gb); s->frame_pred_frame_dct = get_bits1(&s->gb); s->concealment_motion_vectors = get_bits1(&s->gb); s->q_scale_type = get_bits1(&s->gb); s->intra_vlc_format = get_bits1(&s->gb); s->alternate_scan = get_bits1(&s->gb); s->repeat_first_field = get_bits1(&s->gb); s->chroma_420_type = get_bits1(&s->gb); s->progressive_frame = get_bits1(&s->gb); if (s->progressive_sequence && !s->progressive_frame) { s->progressive_frame = 1; av_log(s->avctx, AV_LOG_ERROR, "interlaced frame in progressive sequence, ignoring\n"); } if (s->picture_structure == 0 || (s->progressive_frame && s->picture_structure != PICT_FRAME)) { av_log(s->avctx, AV_LOG_ERROR, "picture_structure %d invalid, ignoring\n", s->picture_structure); s->picture_structure = PICT_FRAME; } if (s->progressive_sequence && !s->frame_pred_frame_dct) av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n"); if (s->picture_structure == PICT_FRAME) { s->first_field = 0; s->v_edge_pos = 16 * s->mb_height; } else { s->first_field ^= 1; s->v_edge_pos = 8 * s->mb_height; memset(s->mbskip_table, 0, s->mb_stride * s->mb_height); } if (s->alternate_scan) { ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan); ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan); } else { ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct); ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct); } /* composite display not parsed */ ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision); ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure); ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first); ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field); ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors); ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format); ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan); ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct); ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame); } static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size) { AVCodecContext *avctx = s->avctx; Mpeg1Context *s1 = (Mpeg1Context *) s; int ret; /* start frame decoding */ if (s->first_field || s->picture_structure == PICT_FRAME) { AVFrameSideData *pan_scan; if ((ret = ff_mpv_frame_start(s, avctx)) < 0) return ret; ff_mpeg_er_frame_start(s); /* first check if we must repeat the frame */ s->current_picture_ptr->f->repeat_pict = 0; if (s->repeat_first_field) { if (s->progressive_sequence) { if (s->top_field_first) s->current_picture_ptr->f->repeat_pict = 4; else s->current_picture_ptr->f->repeat_pict = 2; } else if (s->progressive_frame) { s->current_picture_ptr->f->repeat_pict = 1; } } pan_scan = av_frame_new_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_PANSCAN, sizeof(s1->pan_scan)); if (!pan_scan) return AVERROR(ENOMEM); memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan)); if (s1->a53_caption) { AVFrameSideData *sd = av_frame_new_side_data( s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC, s1->a53_caption_size); if (sd) memcpy(sd->data, s1->a53_caption, s1->a53_caption_size); av_freep(&s1->a53_caption); } if (s1->has_stereo3d) { AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f); if (!stereo) return AVERROR(ENOMEM); *stereo = s1->stereo3d; s1->has_stereo3d = 0; } if (s1->has_afd) { AVFrameSideData *sd = av_frame_new_side_data(s->current_picture_ptr->f, AV_FRAME_DATA_AFD, 1); if (!sd) return AVERROR(ENOMEM); *sd->data = s1->afd; s1->has_afd = 0; } if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME)) ff_thread_finish_setup(avctx); } else { // second field int i; if (!s->current_picture_ptr) { av_log(s->avctx, AV_LOG_ERROR, "first field missing\n"); return AVERROR_INVALIDDATA; } if (s->avctx->hwaccel && (s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) { if (s->avctx->hwaccel->end_frame(s->avctx) < 0) av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode first field\n"); } for (i = 0; i < 4; i++) { s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i]; if (s->picture_structure == PICT_BOTTOM_FIELD) s->current_picture.f->data[i] += s->current_picture_ptr->f->linesize[i]; } } if (avctx->hwaccel) { if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0) return ret; } #if FF_API_XVMC FF_DISABLE_DEPRECATION_WARNINGS // ff_mpv_frame_start will call this function too, // but we need to call it on every field if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration) if (ff_xvmc_field_start(s, avctx) < 0) return -1; FF_ENABLE_DEPRECATION_WARNINGS #endif /* FF_API_XVMC */ return 0; } #define DECODE_SLICE_ERROR -1 #define DECODE_SLICE_OK 0 /** * Decode a slice. * MpegEncContext.mb_y must be set to the MB row from the startcode. * @return DECODE_SLICE_ERROR if the slice is damaged, * DECODE_SLICE_OK if this slice is OK */ static int mpeg_decode_slice(MpegEncContext *s, int mb_y, const uint8_t **buf, int buf_size) { AVCodecContext *avctx = s->avctx; const int field_pic = s->picture_structure != PICT_FRAME; int ret; s->resync_mb_x = s->resync_mb_y = -1; assert(mb_y < s->mb_height); init_get_bits(&s->gb, *buf, buf_size * 8); ff_mpeg1_clean_buffers(s); s->interlaced_dct = 0; s->qscale = get_qscale(s); if (s->qscale == 0) { av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n"); return AVERROR_INVALIDDATA; } /* extra slice info */ while (get_bits1(&s->gb) != 0) skip_bits(&s->gb, 8); s->mb_x = 0; if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) { skip_bits1(&s->gb); } else { while (get_bits_left(&s->gb) > 0) { int code = get_vlc2(&s->gb, ff_mbincr_vlc.table, MBINCR_VLC_BITS, 2); if (code < 0) { av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n"); return AVERROR_INVALIDDATA; } if (code >= 33) { if (code == 33) s->mb_x += 33; /* otherwise, stuffing, nothing to do */ } else { s->mb_x += code; break; } } } if (s->mb_x >= (unsigned) s->mb_width) { av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n"); return AVERROR_INVALIDDATA; } if (avctx->hwaccel) { const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */ int start_code = -1; buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code); if (buf_end < *buf + buf_size) buf_end -= 4; s->mb_y = mb_y; if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0) return DECODE_SLICE_ERROR; *buf = buf_end; return DECODE_SLICE_OK; } s->resync_mb_x = s->mb_x; s->resync_mb_y = s->mb_y = mb_y; s->mb_skip_run = 0; ff_init_block_index(s); if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) { if (s->avctx->debug & FF_DEBUG_PICT_INFO) { av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n", s->qscale, s->mpeg_f_code[0][0], s->mpeg_f_code[0][1], s->mpeg_f_code[1][0], s->mpeg_f_code[1][1], s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")), s->progressive_sequence ? "ps" : "", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" : "", s->top_field_first ? "top" : "", s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors, s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" : ""); } } for (;;) { #if FF_API_XVMC FF_DISABLE_DEPRECATION_WARNINGS // If 1, we memcpy blocks in xvmcvideo. if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) ff_xvmc_init_block(s); // set s->block FF_ENABLE_DEPRECATION_WARNINGS #endif /* FF_API_XVMC */ if ((ret = mpeg_decode_mb(s, s->block)) < 0) return ret; // Note motion_val is normally NULL unless we want to extract the MVs. if (s->current_picture.motion_val[0] && !s->encoding) { const int wrap = s->b8_stride; int xy = s->mb_x * 2 + s->mb_y * 2 * wrap; int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride); int motion_x, motion_y, dir, i; for (i = 0; i < 2; i++) { for (dir = 0; dir < 2; dir++) { if (s->mb_intra || (dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) { motion_x = motion_y = 0; } else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)) { motion_x = s->mv[dir][0][0]; motion_y = s->mv[dir][0][1]; } else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */ motion_x = s->mv[dir][i][0]; motion_y = s->mv[dir][i][1]; } s->current_picture.motion_val[dir][xy][0] = motion_x; s->current_picture.motion_val[dir][xy][1] = motion_y; s->current_picture.motion_val[dir][xy + 1][0] = motion_x; s->current_picture.motion_val[dir][xy + 1][1] = motion_y; s->current_picture.ref_index [dir][b8_xy] = s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i]; assert(s->field_select[dir][i] == 0 || s->field_select[dir][i] == 1); } xy += wrap; b8_xy += 2; } } s->dest[0] += 16; s->dest[1] += 16 >> s->chroma_x_shift; s->dest[2] += 16 >> s->chroma_x_shift; ff_mpv_decode_mb(s, s->block); if (++s->mb_x >= s->mb_width) { const int mb_size = 16; ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size); ff_mpv_report_decode_progress(s); s->mb_x = 0; s->mb_y += 1 << field_pic; if (s->mb_y >= s->mb_height) { int left = get_bits_left(&s->gb); int is_d10 = s->chroma_format == 2 && s->pict_type == AV_PICTURE_TYPE_I && avctx->profile == 0 && avctx->level == 5 && s->intra_dc_precision == 2 && s->q_scale_type == 1 && s->alternate_scan == 0 && s->progressive_frame == 0 /* vbv_delay == 0xBBB || 0xE10 */; if (left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) || ((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) { av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n", left, show_bits(&s->gb, FFMIN(left, 23))); return AVERROR_INVALIDDATA; } else goto eos; } ff_init_block_index(s); } /* skip mb handling */ if (s->mb_skip_run == -1) { /* read increment again */ s->mb_skip_run = 0; for (;;) { int code = get_vlc2(&s->gb, ff_mbincr_vlc.table, MBINCR_VLC_BITS, 2); if (code < 0) { av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n"); return AVERROR_INVALIDDATA; } if (code >= 33) { if (code == 33) { s->mb_skip_run += 33; } else if (code == 35) { if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) { av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n"); return AVERROR_INVALIDDATA; } goto eos; /* end of slice */ } /* otherwise, stuffing, nothing to do */ } else { s->mb_skip_run += code; break; } } if (s->mb_skip_run) { int i; if (s->pict_type == AV_PICTURE_TYPE_I) { av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %d\n", s->mb_x, s->mb_y); return AVERROR_INVALIDDATA; } /* skip mb */ s->mb_intra = 0; for (i = 0; i < 12; i++) s->block_last_index[i] = -1; if (s->picture_structure == PICT_FRAME) s->mv_type = MV_TYPE_16X16; else s->mv_type = MV_TYPE_FIELD; if (s->pict_type == AV_PICTURE_TYPE_P) { /* if P type, zero motion vector is implied */ s->mv_dir = MV_DIR_FORWARD; s->mv[0][0][0] = s->mv[0][0][1] = 0; s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0; s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0; s->field_select[0][0] = (s->picture_structure - 1) & 1; } else { /* if B type, reuse previous vectors and directions */ s->mv[0][0][0] = s->last_mv[0][0][0]; s->mv[0][0][1] = s->last_mv[0][0][1]; s->mv[1][0][0] = s->last_mv[1][0][0]; s->mv[1][0][1] = s->last_mv[1][0][1]; } } } } eos: // end of slice *buf += (get_bits_count(&s->gb) - 1) / 8; ff_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y); return 0; } static int slice_decode_thread(AVCodecContext *c, void *arg) { MpegEncContext *s = *(void **) arg; const uint8_t *buf = s->gb.buffer; int mb_y = s->start_mb_y; const int field_pic = s->picture_structure != PICT_FRAME; s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic; for (;;) { uint32_t start_code; int ret; ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf); emms_c(); ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n", ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->er.error_count); if (ret < 0) { if (c->err_recognition & AV_EF_EXPLODE) return ret; if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0) ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR); } else { ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y, ER_AC_END | ER_DC_END | ER_MV_END); } if (s->mb_y == s->end_mb_y) return 0; start_code = -1; buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code); mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic; if (s->picture_structure == PICT_BOTTOM_FIELD) mb_y++; if (mb_y < 0 || mb_y >= s->end_mb_y) return AVERROR_INVALIDDATA; } } /** * Handle slice ends. * @return 1 if it seems to be the last slice */ static int slice_end(AVCodecContext *avctx, AVFrame *pict) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr) return 0; if (s->avctx->hwaccel) { if (s->avctx->hwaccel->end_frame(s->avctx) < 0) av_log(avctx, AV_LOG_ERROR, "hardware accelerator failed to decode picture\n"); } #if FF_API_XVMC FF_DISABLE_DEPRECATION_WARNINGS if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration) ff_xvmc_field_end(s); FF_ENABLE_DEPRECATION_WARNINGS #endif /* FF_API_XVMC */ /* end of slice reached */ if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) { /* end of image */ ff_er_frame_end(&s->er); ff_mpv_frame_end(s); if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) { int ret = av_frame_ref(pict, s->current_picture_ptr->f); if (ret < 0) return ret; ff_print_debug_info(s, s->current_picture_ptr); } else { if (avctx->active_thread_type & FF_THREAD_FRAME) s->picture_number++; /* latency of 1 frame for I- and P-frames */ /* XXX: use another variable than picture_number */ if (s->last_picture_ptr) { int ret = av_frame_ref(pict, s->last_picture_ptr->f); if (ret < 0) return ret; ff_print_debug_info(s, s->last_picture_ptr); } } return 1; } else { return 0; } } static int mpeg1_decode_sequence(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int width, height; int i, v, j; init_get_bits(&s->gb, buf, buf_size * 8); width = get_bits(&s->gb, 12); height = get_bits(&s->gb, 12); if (width == 0 || height == 0) { av_log(avctx, AV_LOG_WARNING, "Invalid horizontal or vertical size value.\n"); if (avctx->err_recognition & AV_EF_BITSTREAM) return AVERROR_INVALIDDATA; } s->aspect_ratio_info = get_bits(&s->gb, 4); if (s->aspect_ratio_info == 0) { av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n"); if (avctx->err_recognition & AV_EF_BITSTREAM) return AVERROR_INVALIDDATA; } s->frame_rate_index = get_bits(&s->gb, 4); if (s->frame_rate_index == 0 || s->frame_rate_index > 13) { av_log(avctx, AV_LOG_WARNING, "frame_rate_index %d is invalid\n", s->frame_rate_index); return AVERROR_INVALIDDATA; } s->bit_rate = get_bits(&s->gb, 18) * 400; if (get_bits1(&s->gb) == 0) { /* marker */ av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n"); return AVERROR_INVALIDDATA; } s->width = width; s->height = height; s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16; skip_bits(&s->gb, 1); /* get matrix */ if (get_bits1(&s->gb)) { load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1); } else { for (i = 0; i < 64; i++) { j = s->idsp.idct_permutation[i]; v = ff_mpeg1_default_intra_matrix[i]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; } } if (get_bits1(&s->gb)) { load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0); } else { for (i = 0; i < 64; i++) { int j = s->idsp.idct_permutation[i]; v = ff_mpeg1_default_non_intra_matrix[i]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } } if (show_bits(&s->gb, 23) != 0) { av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n"); return AVERROR_INVALIDDATA; } /* We set MPEG-2 parameters so that it emulates MPEG-1. */ s->progressive_sequence = 1; s->progressive_frame = 1; s->picture_structure = PICT_FRAME; s->frame_pred_frame_dct = 1; s->chroma_format = 1; s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO; s->out_format = FMT_MPEG1; if (s->avctx->flags & CODEC_FLAG_LOW_DELAY) s->low_delay = 1; if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n", s->avctx->rc_buffer_size, s->bit_rate); return 0; } static int vcr2_init_sequence(AVCodecContext *avctx) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int i, v, ret; /* start new MPEG-1 context decoding */ s->out_format = FMT_MPEG1; if (s1->mpeg_enc_ctx_allocated) { ff_mpv_common_end(s); } s->width = avctx->coded_width; s->height = avctx->coded_height; avctx->has_b_frames = 0; // true? s->low_delay = 1; avctx->pix_fmt = mpeg_get_pixelformat(avctx); #if FF_API_XVMC if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO) #else if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO) #endif /* FF_API_XVMC */ avctx->idct_algo = FF_IDCT_SIMPLE; ff_mpv_idct_init(s); if ((ret = ff_mpv_common_init(s)) < 0) return ret; s1->mpeg_enc_ctx_allocated = 1; for (i = 0; i < 64; i++) { int j = s->idsp.idct_permutation[i]; v = ff_mpeg1_default_intra_matrix[i]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; v = ff_mpeg1_default_non_intra_matrix[i]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } s->progressive_sequence = 1; s->progressive_frame = 1; s->picture_structure = PICT_FRAME; s->frame_pred_frame_dct = 1; s->chroma_format = 1; s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO; s1->save_width = s->width; s1->save_height = s->height; s1->save_progressive_seq = s->progressive_sequence; return 0; } static int mpeg_decode_a53_cc(AVCodecContext *avctx, const uint8_t *p, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; if (buf_size >= 6 && p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' && p[4] == 3 && (p[5] & 0x40)) { /* extract A53 Part 4 CC data */ int cc_count = p[5] & 0x1f; if (cc_count > 0 && buf_size >= 7 + cc_count * 3) { av_freep(&s1->a53_caption); s1->a53_caption_size = cc_count * 3; s1->a53_caption = av_malloc(s1->a53_caption_size); if (s1->a53_caption) memcpy(s1->a53_caption, p + 7, s1->a53_caption_size); } return 1; } else if (buf_size >= 11 && p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) { /* extract DVD CC data */ int cc_count = 0; int i; // There is a caption count field in the data, but it is often // incorect. So count the number of captions present. for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6) cc_count++; // Transform the DVD format into A53 Part 4 format if (cc_count > 0) { av_freep(&s1->a53_caption); s1->a53_caption_size = cc_count * 6; s1->a53_caption = av_malloc(s1->a53_caption_size); if (s1->a53_caption) { uint8_t field1 = !!(p[4] & 0x80); uint8_t *cap = s1->a53_caption; p += 5; for (i = 0; i < cc_count; i++) { cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd; cap[1] = p[1]; cap[2] = p[2]; cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd; cap[4] = p[4]; cap[5] = p[5]; cap += 6; p += 6; } } } return 1; } return 0; } static void mpeg_decode_user_data(AVCodecContext *avctx, const uint8_t *p, int buf_size) { const uint8_t *buf_end = p + buf_size; Mpeg1Context *s1 = avctx->priv_data; /* we parse the DTG active format information */ if (buf_end - p >= 5 && p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') { int flags = p[4]; p += 5; if (flags & 0x80) { /* skip event id */ p += 2; } if (flags & 0x40) { if (buf_end - p < 1) return; #if FF_API_AFD FF_DISABLE_DEPRECATION_WARNINGS avctx->dtg_active_format = p[0] & 0x0f; FF_ENABLE_DEPRECATION_WARNINGS #endif /* FF_API_AFD */ s1->has_afd = 1; s1->afd = p[0] & 0x0f; } } else if (buf_end - p >= 6 && p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' && p[4] == 0x03) { // S3D_video_format_length // the 0x7F mask ignores the reserved_bit value const uint8_t S3D_video_format_type = p[5] & 0x7F; if (S3D_video_format_type == 0x03 || S3D_video_format_type == 0x04 || S3D_video_format_type == 0x08 || S3D_video_format_type == 0x23) { s1->has_stereo3d = 1; switch (S3D_video_format_type) { case 0x03: s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE; break; case 0x04: s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM; break; case 0x08: s1->stereo3d.type = AV_STEREO3D_2D; break; case 0x23: s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX; break; } } } else if (mpeg_decode_a53_cc(avctx, p, buf_size)) { return; } } static void mpeg_decode_gop(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int time_code_hours, time_code_minutes; int time_code_seconds, time_code_pictures; int broken_link; init_get_bits(&s->gb, buf, buf_size * 8); skip_bits1(&s->gb); /* drop_frame_flag */ time_code_hours = get_bits(&s->gb, 5); time_code_minutes = get_bits(&s->gb, 6); skip_bits1(&s->gb); // marker bit time_code_seconds = get_bits(&s->gb, 6); time_code_pictures = get_bits(&s->gb, 6); s1->closed_gop = get_bits1(&s->gb); /* broken_link indicate that after editing the * reference frames of the first B-Frames after GOP I-Frame * are missing (open gop) */ broken_link = get_bits1(&s->gb); if (s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n", time_code_hours, time_code_minutes, time_code_seconds, time_code_pictures, s1->closed_gop, broken_link); } static int decode_chunks(AVCodecContext *avctx, AVFrame *picture, int *got_output, const uint8_t *buf, int buf_size) { Mpeg1Context *s = avctx->priv_data; MpegEncContext *s2 = &s->mpeg_enc_ctx; const uint8_t *buf_ptr = buf; const uint8_t *buf_end = buf + buf_size; int ret, input_size; int last_code = 0, skip_frame = 0; for (;;) { /* find next start code */ uint32_t start_code = -1; buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code); if (start_code > 0x1ff) { if (!skip_frame) { if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && !avctx->hwaccel) { int i; avctx->execute(avctx, slice_decode_thread, &s2->thread_context[0], NULL, s->slice_count, sizeof(void *)); for (i = 0; i < s->slice_count; i++) s2->er.error_count += s2->thread_context[i]->er.error_count; } ret = slice_end(avctx, picture); if (ret < 0) return ret; else if (ret) { // FIXME: merge with the stuff in mpeg_decode_slice if (s2->last_picture_ptr || s2->low_delay) *got_output = 1; } } s2->pict_type = 0; return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index); } input_size = buf_end - buf_ptr; if (avctx->debug & FF_DEBUG_STARTCODE) av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n", start_code, buf_ptr - buf, input_size); /* prepare data for next start code */ switch (start_code) { case SEQ_START_CODE: if (last_code == 0) { mpeg1_decode_sequence(avctx, buf_ptr, input_size); s->sync = 1; } else { av_log(avctx, AV_LOG_ERROR, "ignoring SEQ_START_CODE after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; case PICTURE_START_CODE: if (s2->width <= 0 || s2->height <= 0) { av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n", s2->width, s2->height); return AVERROR_INVALIDDATA; } if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && !avctx->hwaccel && s->slice_count) { int i; avctx->execute(avctx, slice_decode_thread, s2->thread_context, NULL, s->slice_count, sizeof(void *)); for (i = 0; i < s->slice_count; i++) s2->er.error_count += s2->thread_context[i]->er.error_count; s->slice_count = 0; } if (last_code == 0 || last_code == SLICE_MIN_START_CODE) { ret = mpeg_decode_postinit(avctx); if (ret < 0) { av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n"); return ret; } /* We have a complete image: we try to decompress it. */ if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0) s2->pict_type = 0; s->first_slice = 1; last_code = PICTURE_START_CODE; } else { av_log(avctx, AV_LOG_ERROR, "ignoring pic after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; case EXT_START_CODE: init_get_bits(&s2->gb, buf_ptr, input_size * 8); switch (get_bits(&s2->gb, 4)) { case 0x1: if (last_code == 0) { mpeg_decode_sequence_extension(s); } else { av_log(avctx, AV_LOG_ERROR, "ignoring seq ext after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; case 0x2: mpeg_decode_sequence_display_extension(s); break; case 0x3: mpeg_decode_quant_matrix_extension(s2); break; case 0x7: mpeg_decode_picture_display_extension(s); break; case 0x8: if (last_code == PICTURE_START_CODE) { mpeg_decode_picture_coding_extension(s); } else { av_log(avctx, AV_LOG_ERROR, "ignoring pic cod ext after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; } break; case USER_START_CODE: mpeg_decode_user_data(avctx, buf_ptr, input_size); break; case GOP_START_CODE: if (last_code == 0) { s2->first_field = 0; mpeg_decode_gop(avctx, buf_ptr, input_size); s->sync = 1; } else { av_log(avctx, AV_LOG_ERROR, "ignoring GOP_START_CODE after %X\n", last_code); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; } break; default: if (start_code >= SLICE_MIN_START_CODE && start_code <= SLICE_MAX_START_CODE && last_code != 0) { const int field_pic = s2->picture_structure != PICT_FRAME; int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic; last_code = SLICE_MIN_START_CODE; if (s2->picture_structure == PICT_BOTTOM_FIELD) mb_y++; if (mb_y >= s2->mb_height) { av_log(s2->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s2->mb_height); return AVERROR_INVALIDDATA; } if (!s2->last_picture_ptr) { /* Skip B-frames if we do not have reference frames and * GOP is not closed. */ if (s2->pict_type == AV_PICTURE_TYPE_B) { if (!s->closed_gop) { skip_frame = 1; break; } } } if (s2->pict_type == AV_PICTURE_TYPE_I) s->sync = 1; if (!s2->next_picture_ptr) { /* Skip P-frames if we do not have a reference frame or * we have an invalid header. */ if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) { skip_frame = 1; break; } } if ((avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type == AV_PICTURE_TYPE_B) || (avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type != AV_PICTURE_TYPE_I) || avctx->skip_frame >= AVDISCARD_ALL) { skip_frame = 1; break; } if (!s->mpeg_enc_ctx_allocated) break; if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) { if (mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom) break; } if (!s2->pict_type) { av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n"); if (avctx->err_recognition & AV_EF_EXPLODE) return AVERROR_INVALIDDATA; break; } if (s->first_slice) { skip_frame = 0; s->first_slice = 0; if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0) return ret; } if (!s2->current_picture_ptr) { av_log(avctx, AV_LOG_ERROR, "current_picture not initialized\n"); return AVERROR_INVALIDDATA; } if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && !avctx->hwaccel) { int threshold = (s2->mb_height * s->slice_count + s2->slice_context_count / 2) / s2->slice_context_count; if (threshold <= mb_y) { MpegEncContext *thread_context = s2->thread_context[s->slice_count]; thread_context->start_mb_y = mb_y; thread_context->end_mb_y = s2->mb_height; if (s->slice_count) { s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y; ret = ff_update_duplicate_context(thread_context, s2); if (ret < 0) return ret; } init_get_bits(&thread_context->gb, buf_ptr, input_size * 8); s->slice_count++; } buf_ptr += 2; // FIXME add minimum number of bytes per slice } else { ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size); emms_c(); if (ret < 0) { if (avctx->err_recognition & AV_EF_EXPLODE) return ret; if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0) ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR); } else { ff_er_add_slice(&s2->er, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x - 1, s2->mb_y, ER_AC_END | ER_DC_END | ER_MV_END); } } } break; } } } static int mpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_output, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; Mpeg1Context *s = avctx->priv_data; AVFrame *picture = data; MpegEncContext *s2 = &s->mpeg_enc_ctx; ff_dlog(avctx, "fill_buffer\n"); if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) { /* special case for last picture */ if (s2->low_delay == 0 && s2->next_picture_ptr) { int ret = av_frame_ref(picture, s2->next_picture_ptr->f); if (ret < 0) return ret; s2->next_picture_ptr = NULL; *got_output = 1; } return buf_size; } if (s2->avctx->flags & CODEC_FLAG_TRUNCATED) { int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size, NULL); if (ff_combine_frame(&s2->parse_context, next, (const uint8_t **) &buf, &buf_size) < 0) return buf_size; } if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2")) vcr2_init_sequence(avctx); s->slice_count = 0; if (avctx->extradata && !s->extradata_decoded) { int ret = decode_chunks(avctx, picture, got_output, avctx->extradata, avctx->extradata_size); s->extradata_decoded = 1; if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) return ret; } return decode_chunks(avctx, picture, got_output, buf, buf_size); } static void flush(AVCodecContext *avctx) { Mpeg1Context *s = avctx->priv_data; s->sync = 0; s->closed_gop = 0; ff_mpeg_flush(avctx); } static av_cold int mpeg_decode_end(AVCodecContext *avctx) { Mpeg1Context *s = avctx->priv_data; if (s->mpeg_enc_ctx_allocated) ff_mpv_common_end(&s->mpeg_enc_ctx); av_freep(&s->a53_caption); return 0; } static const AVProfile mpeg2_video_profiles[] = { { FF_PROFILE_MPEG2_422, "4:2:2" }, { FF_PROFILE_MPEG2_HIGH, "High" }, { FF_PROFILE_MPEG2_SS, "Spatially Scalable" }, { FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" }, { FF_PROFILE_MPEG2_MAIN, "Main" }, { FF_PROFILE_MPEG2_SIMPLE, "Simple" }, { FF_PROFILE_RESERVED, "Reserved" }, { FF_PROFILE_RESERVED, "Reserved" }, { FF_PROFILE_UNKNOWN }, }; AVCodec ff_mpeg1video_decoder = { .name = "mpeg1video", .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_MPEG1VIDEO, .priv_data_size = sizeof(Mpeg1Context), .init = mpeg_decode_init, .close = mpeg_decode_end, .decode = mpeg_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS, .flush = flush, .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context) }; AVCodec ff_mpeg2video_decoder = { .name = "mpeg2video", .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_MPEG2VIDEO, .priv_data_size = sizeof(Mpeg1Context), .init = mpeg_decode_init, .close = mpeg_decode_end, .decode = mpeg_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_SLICE_THREADS, .flush = flush, .profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles), }; #if FF_API_XVMC #if CONFIG_MPEG_XVMC_DECODER static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx) { if (avctx->active_thread_type & FF_THREAD_SLICE) return -1; if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER)) return -1; if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) { ff_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n"); } mpeg_decode_init(avctx); avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT; avctx->xvmc_acceleration = 2; // 2 - the blocks are packed! return 0; } AVCodec ff_mpeg_xvmc_decoder = { .name = "mpegvideo_xvmc", .long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_MPEG2VIDEO_XVMC, .priv_data_size = sizeof(Mpeg1Context), .init = mpeg_mc_decode_init, .close = mpeg_decode_end, .decode = mpeg_decode_frame, .capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL | CODEC_CAP_DELAY, .flush = flush, }; #endif #endif /* FF_API_XVMC */