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419 lines
15 KiB
419 lines
15 KiB
/* |
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* DV decoder |
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* Copyright (c) 2002 Fabrice Bellard |
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* Copyright (c) 2004 Roman Shaposhnik |
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* |
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* 50 Mbps (DVCPRO50) support |
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* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com> |
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* |
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* 100 Mbps (DVCPRO HD) support |
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* Initial code by Daniel Maas <dmaas@maasdigital.com> (funded by BBC R&D) |
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* Final code by Roman Shaposhnik |
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* |
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* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth |
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* of DV technical info. |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* DV decoder |
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*/ |
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#include "libavutil/imgutils.h" |
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#include "libavutil/internal.h" |
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#include "libavutil/pixdesc.h" |
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#include "avcodec.h" |
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#include "dv.h" |
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#include "dvdata.h" |
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#include "get_bits.h" |
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#include "idctdsp.h" |
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#include "internal.h" |
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#include "put_bits.h" |
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#include "simple_idct.h" |
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typedef struct BlockInfo { |
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const uint32_t *factor_table; |
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const uint8_t *scan_table; |
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uint8_t pos; /* position in block */ |
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void (*idct_put)(uint8_t *dest, int line_size, int16_t *block); |
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uint8_t partial_bit_count; |
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uint32_t partial_bit_buffer; |
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int shift_offset; |
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} BlockInfo; |
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static const int dv_iweight_bits = 14; |
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static av_cold int dvvideo_decode_init(AVCodecContext *avctx) |
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{ |
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DVVideoContext *s = avctx->priv_data; |
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IDCTDSPContext idsp; |
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int i; |
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ff_idctdsp_init(&idsp, avctx); |
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for (i = 0; i < 64; i++) |
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s->dv_zigzag[0][i] = idsp.idct_permutation[ff_zigzag_direct[i]]; |
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memcpy(s->dv_zigzag[1], ff_dv_zigzag248_direct, sizeof(s->dv_zigzag[1])); |
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s->idct_put[0] = idsp.idct_put; |
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s->idct_put[1] = ff_simple_idct248_put; |
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return ff_dvvideo_init(avctx); |
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} |
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/* decode AC coefficients */ |
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static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, int16_t *block) |
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{ |
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int last_index = gb->size_in_bits; |
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const uint8_t *scan_table = mb->scan_table; |
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const uint32_t *factor_table = mb->factor_table; |
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int pos = mb->pos; |
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int partial_bit_count = mb->partial_bit_count; |
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int level, run, vlc_len, index; |
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OPEN_READER_NOSIZE(re, gb); |
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UPDATE_CACHE(re, gb); |
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/* if we must parse a partial VLC, we do it here */ |
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if (partial_bit_count > 0) { |
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re_cache = re_cache >> partial_bit_count | |
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mb->partial_bit_buffer; |
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re_index -= partial_bit_count; |
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mb->partial_bit_count = 0; |
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} |
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/* get the AC coefficients until last_index is reached */ |
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for (;;) { |
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av_dlog(NULL, "%2d: bits=%04x index=%d\n", pos, SHOW_UBITS(re, gb, 16), |
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re_index); |
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/* our own optimized GET_RL_VLC */ |
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index = NEG_USR32(re_cache, TEX_VLC_BITS); |
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vlc_len = ff_dv_rl_vlc[index].len; |
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if (vlc_len < 0) { |
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index = NEG_USR32((unsigned) re_cache << TEX_VLC_BITS, -vlc_len) + |
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ff_dv_rl_vlc[index].level; |
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vlc_len = TEX_VLC_BITS - vlc_len; |
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} |
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level = ff_dv_rl_vlc[index].level; |
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run = ff_dv_rl_vlc[index].run; |
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/* gotta check if we're still within gb boundaries */ |
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if (re_index + vlc_len > last_index) { |
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/* should be < 16 bits otherwise a codeword could have been parsed */ |
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mb->partial_bit_count = last_index - re_index; |
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mb->partial_bit_buffer = re_cache & ~(-1u >> mb->partial_bit_count); |
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re_index = last_index; |
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break; |
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} |
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re_index += vlc_len; |
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av_dlog(NULL, "run=%d level=%d\n", run, level); |
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pos += run; |
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if (pos >= 64) |
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break; |
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level = (level * factor_table[pos] + (1 << (dv_iweight_bits - 1))) >> |
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dv_iweight_bits; |
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block[scan_table[pos]] = level; |
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UPDATE_CACHE(re, gb); |
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} |
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CLOSE_READER(re, gb); |
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mb->pos = pos; |
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} |
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static inline void bit_copy(PutBitContext *pb, GetBitContext *gb) |
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{ |
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int bits_left = get_bits_left(gb); |
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while (bits_left >= MIN_CACHE_BITS) { |
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put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS)); |
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bits_left -= MIN_CACHE_BITS; |
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} |
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if (bits_left > 0) |
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put_bits(pb, bits_left, get_bits(gb, bits_left)); |
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} |
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/* mb_x and mb_y are in units of 8 pixels */ |
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static int dv_decode_video_segment(AVCodecContext *avctx, void *arg) |
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{ |
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DVVideoContext *s = avctx->priv_data; |
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DVwork_chunk *work_chunk = arg; |
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int quant, dc, dct_mode, class1, j; |
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int mb_index, mb_x, mb_y, last_index; |
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int y_stride, linesize; |
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int16_t *block, *block1; |
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int c_offset; |
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uint8_t *y_ptr; |
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const uint8_t *buf_ptr; |
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PutBitContext pb, vs_pb; |
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GetBitContext gb; |
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BlockInfo mb_data[5 * DV_MAX_BPM], *mb, *mb1; |
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LOCAL_ALIGNED_16(int16_t, sblock, [5 * DV_MAX_BPM], [64]); |
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LOCAL_ALIGNED_16(uint8_t, mb_bit_buffer, [80 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */ |
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LOCAL_ALIGNED_16(uint8_t, vs_bit_buffer, [80 * 5 + FF_INPUT_BUFFER_PADDING_SIZE]); /* allow some slack */ |
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const int log2_blocksize = 3; |
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int is_field_mode[5]; |
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assert((((int) mb_bit_buffer) & 7) == 0); |
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assert((((int) vs_bit_buffer) & 7) == 0); |
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memset(sblock, 0, 5 * DV_MAX_BPM * sizeof(*sblock)); |
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/* pass 1: read DC and AC coefficients in blocks */ |
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buf_ptr = &s->buf[work_chunk->buf_offset * 80]; |
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block1 = &sblock[0][0]; |
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mb1 = mb_data; |
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init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80); |
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for (mb_index = 0; mb_index < 5; mb_index++, mb1 += s->sys->bpm, block1 += s->sys->bpm * 64) { |
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/* skip header */ |
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quant = buf_ptr[3] & 0x0f; |
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buf_ptr += 4; |
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init_put_bits(&pb, mb_bit_buffer, 80); |
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mb = mb1; |
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block = block1; |
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is_field_mode[mb_index] = 0; |
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for (j = 0; j < s->sys->bpm; j++) { |
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last_index = s->sys->block_sizes[j]; |
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init_get_bits(&gb, buf_ptr, last_index); |
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/* get the DC */ |
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dc = get_sbits(&gb, 9); |
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dct_mode = get_bits1(&gb); |
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class1 = get_bits(&gb, 2); |
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if (DV_PROFILE_IS_HD(s->sys)) { |
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mb->idct_put = s->idct_put[0]; |
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mb->scan_table = s->dv_zigzag[0]; |
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mb->factor_table = &s->idct_factor[(j >= 4) * 4 * 16 * 64 + |
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class1 * 16 * 64 + |
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quant * 64]; |
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is_field_mode[mb_index] |= !j && dct_mode; |
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} else { |
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mb->idct_put = s->idct_put[dct_mode && log2_blocksize == 3]; |
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mb->scan_table = s->dv_zigzag[dct_mode]; |
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mb->factor_table = |
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&s->idct_factor[(class1 == 3) * 2 * 22 * 64 + |
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dct_mode * 22 * 64 + |
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(quant + ff_dv_quant_offset[class1]) * 64]; |
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} |
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dc = dc << 2; |
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/* convert to unsigned because 128 is not added in the |
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* standard IDCT */ |
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dc += 1024; |
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block[0] = dc; |
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buf_ptr += last_index >> 3; |
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mb->pos = 0; |
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mb->partial_bit_count = 0; |
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av_dlog(avctx, "MB block: %d, %d ", mb_index, j); |
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dv_decode_ac(&gb, mb, block); |
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/* write the remaining bits in a new buffer only if the |
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* block is finished */ |
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if (mb->pos >= 64) |
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bit_copy(&pb, &gb); |
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block += 64; |
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mb++; |
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} |
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/* pass 2: we can do it just after */ |
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av_dlog(avctx, "***pass 2 size=%d MB#=%d\n", put_bits_count(&pb), mb_index); |
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block = block1; |
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mb = mb1; |
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init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb)); |
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put_bits32(&pb, 0); // padding must be zeroed |
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flush_put_bits(&pb); |
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for (j = 0; j < s->sys->bpm; j++, block += 64, mb++) { |
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if (mb->pos < 64 && get_bits_left(&gb) > 0) { |
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dv_decode_ac(&gb, mb, block); |
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/* if still not finished, no need to parse other blocks */ |
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if (mb->pos < 64) |
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break; |
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} |
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} |
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/* all blocks are finished, so the extra bytes can be used at |
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* the video segment level */ |
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if (j >= s->sys->bpm) |
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bit_copy(&vs_pb, &gb); |
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} |
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/* we need a pass over the whole video segment */ |
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av_dlog(avctx, "***pass 3 size=%d\n", put_bits_count(&vs_pb)); |
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block = &sblock[0][0]; |
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mb = mb_data; |
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init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb)); |
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put_bits32(&vs_pb, 0); // padding must be zeroed |
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flush_put_bits(&vs_pb); |
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for (mb_index = 0; mb_index < 5; mb_index++) { |
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for (j = 0; j < s->sys->bpm; j++) { |
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if (mb->pos < 64) { |
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av_dlog(avctx, "start %d:%d\n", mb_index, j); |
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dv_decode_ac(&gb, mb, block); |
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} |
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if (mb->pos >= 64 && mb->pos < 127) |
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av_log(avctx, AV_LOG_ERROR, |
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"AC EOB marker is absent pos=%d\n", mb->pos); |
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block += 64; |
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mb++; |
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} |
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} |
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/* compute idct and place blocks */ |
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block = &sblock[0][0]; |
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mb = mb_data; |
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for (mb_index = 0; mb_index < 5; mb_index++) { |
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dv_calculate_mb_xy(s, work_chunk, mb_index, &mb_x, &mb_y); |
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/* idct_put'ting luminance */ |
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if ((s->sys->pix_fmt == AV_PIX_FMT_YUV420P) || |
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(s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) || |
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(s->sys->height >= 720 && mb_y != 134)) { |
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y_stride = (s->frame->linesize[0] << |
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((!is_field_mode[mb_index]) * log2_blocksize)); |
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} else { |
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y_stride = (2 << log2_blocksize); |
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} |
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y_ptr = s->frame->data[0] + |
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((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize); |
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linesize = s->frame->linesize[0] << is_field_mode[mb_index]; |
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mb[0].idct_put(y_ptr, linesize, block + 0 * 64); |
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if (s->sys->video_stype == 4) { /* SD 422 */ |
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mb[2].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 2 * 64); |
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} else { |
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mb[1].idct_put(y_ptr + (1 << log2_blocksize), linesize, block + 1 * 64); |
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mb[2].idct_put(y_ptr + y_stride, linesize, block + 2 * 64); |
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mb[3].idct_put(y_ptr + (1 << log2_blocksize) + y_stride, linesize, block + 3 * 64); |
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} |
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mb += 4; |
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block += 4 * 64; |
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/* idct_put'ting chrominance */ |
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c_offset = (((mb_y >> (s->sys->pix_fmt == AV_PIX_FMT_YUV420P)) * s->frame->linesize[1] + |
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(mb_x >> ((s->sys->pix_fmt == AV_PIX_FMT_YUV411P) ? 2 : 1))) << log2_blocksize); |
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for (j = 2; j; j--) { |
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uint8_t *c_ptr = s->frame->data[j] + c_offset; |
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if (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) { |
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uint64_t aligned_pixels[64 / 8]; |
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uint8_t *pixels = (uint8_t *) aligned_pixels; |
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uint8_t *c_ptr1, *ptr1; |
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int x, y; |
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mb->idct_put(pixels, 8, block); |
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for (y = 0; y < (1 << log2_blocksize); y++, c_ptr += s->frame->linesize[j], pixels += 8) { |
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ptr1 = pixels + (1 << (log2_blocksize - 1)); |
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c_ptr1 = c_ptr + (s->frame->linesize[j] << log2_blocksize); |
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for (x = 0; x < (1 << (log2_blocksize - 1)); x++) { |
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c_ptr[x] = pixels[x]; |
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c_ptr1[x] = ptr1[x]; |
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} |
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} |
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block += 64; |
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mb++; |
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} else { |
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y_stride = (mb_y == 134) ? (1 << log2_blocksize) : |
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s->frame->linesize[j] << ((!is_field_mode[mb_index]) * log2_blocksize); |
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linesize = s->frame->linesize[j] << is_field_mode[mb_index]; |
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(mb++)->idct_put(c_ptr, linesize, block); |
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block += 64; |
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if (s->sys->bpm == 8) { |
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(mb++)->idct_put(c_ptr + y_stride, linesize, block); |
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block += 64; |
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} |
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} |
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} |
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} |
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return 0; |
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} |
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/* NOTE: exactly one frame must be given (120000 bytes for NTSC, |
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* 144000 bytes for PAL - or twice those for 50Mbps) */ |
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static int dvvideo_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame, AVPacket *avpkt) |
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{ |
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uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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DVVideoContext *s = avctx->priv_data; |
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const uint8_t *vsc_pack; |
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int apt, is16_9, ret; |
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const AVDVProfile *sys; |
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sys = av_dv_frame_profile(s->sys, buf, buf_size); |
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if (!sys || buf_size < sys->frame_size) { |
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av_log(avctx, AV_LOG_ERROR, "could not find dv frame profile\n"); |
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return -1; /* NOTE: we only accept several full frames */ |
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} |
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if (sys != s->sys) { |
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ret = ff_dv_init_dynamic_tables(s, sys); |
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if (ret < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Error initializing the work tables.\n"); |
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return ret; |
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} |
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s->sys = sys; |
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} |
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s->frame = data; |
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s->frame->key_frame = 1; |
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s->frame->pict_type = AV_PICTURE_TYPE_I; |
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avctx->pix_fmt = s->sys->pix_fmt; |
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avctx->framerate = av_inv_q(s->sys->time_base); |
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ret = ff_set_dimensions(avctx, s->sys->width, s->sys->height); |
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if (ret < 0) |
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return ret; |
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/* Determine the codec's sample_aspect ratio from the packet */ |
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vsc_pack = buf + 80 * 5 + 48 + 5; |
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if (*vsc_pack == dv_video_control) { |
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apt = buf[4] & 0x07; |
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is16_9 = (vsc_pack[2] & 0x07) == 0x02 || |
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(!apt && (vsc_pack[2] & 0x07) == 0x07); |
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ff_set_sar(avctx, s->sys->sar[is16_9]); |
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} |
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if (ff_get_buffer(avctx, s->frame, 0) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return -1; |
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} |
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s->frame->interlaced_frame = 1; |
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s->frame->top_field_first = 0; |
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s->buf = buf; |
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avctx->execute(avctx, dv_decode_video_segment, s->work_chunks, NULL, |
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dv_work_pool_size(s->sys), sizeof(DVwork_chunk)); |
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emms_c(); |
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/* return image */ |
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*got_frame = 1; |
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return s->sys->frame_size; |
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} |
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AVCodec ff_dvvideo_decoder = { |
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.name = "dvvideo", |
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.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_DVVIDEO, |
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.priv_data_size = sizeof(DVVideoContext), |
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.init = dvvideo_decode_init, |
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.decode = dvvideo_decode_frame, |
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.capabilities = CODEC_CAP_DR1 | CODEC_CAP_SLICE_THREADS, |
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};
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