Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com> Reviewed-by: Tomas Härdin <git@haerdin.se> Signed-off-by: Peter Ross <pross@xvid.org>pull/388/head
Peter Ross
2 years ago
parent
e253bc4b17
commit
3141dbb7ad
9 changed files with 446 additions and 2 deletions
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/*
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* ViewQuest VQC decoder |
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* Copyright (C) 2022 Peter Ross |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "codec_internal.h" |
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#include "decode.h" |
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#include "libavutil/thread.h" |
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#define VECTOR_VLC_BITS 6 |
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static const uint8_t vector_nbits[] = { |
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2, 4, 4, 4, 4, 2, 4, 4, |
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6, 6, 6, 6, 6, 6, 6, 6 |
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}; |
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enum { |
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SKIP_3 = 0x10, |
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SKIP_4, |
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SKIP_5, |
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SKIP_6, |
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STOP_RUN, |
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SIGNED_8BIT, |
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SIGNED_6BIT |
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}; |
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/* vector symbols are signed, but returned unsigned by get_vlc2()
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codebook indexes are cast as uint8_t in seed_codebook() to compensate */ |
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static const int8_t vector_symbols[] = { |
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0, SKIP_3, SKIP_4, SKIP_5, SKIP_6, STOP_RUN, 1, -1, |
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2, 3, 4, SIGNED_8BIT, -2, -3, -4, SIGNED_6BIT |
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}; |
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static VLC vector_vlc; |
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static av_cold void vqc_init_static_data(void) |
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{ |
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INIT_VLC_STATIC_FROM_LENGTHS(&vector_vlc, VECTOR_VLC_BITS, FF_ARRAY_ELEMS(vector_nbits), |
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vector_nbits, 1, |
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vector_symbols, 1, 1, |
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0, 0, 1 << VECTOR_VLC_BITS); |
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} |
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typedef struct VqcContext { |
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AVFrame *frame; |
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uint8_t * vectors; |
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int16_t * coeff, *tmp1, *tmp2; |
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int16_t codebook[4][256]; |
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} VqcContext; |
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static av_cold int vqc_decode_init(AVCodecContext * avctx) |
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{ |
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static AVOnce init_static_once = AV_ONCE_INIT; |
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VqcContext *s = avctx->priv_data; |
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s->vectors = av_malloc((avctx->width * avctx->height * 3) / 2); |
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if (!s->vectors) |
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return AVERROR(ENOMEM); |
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s->coeff = av_malloc_array(2 * avctx->width, sizeof(s->coeff[0])); |
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if (!s->coeff) |
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return AVERROR(ENOMEM); |
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s->tmp1 = av_malloc_array(avctx->width / 2, sizeof(s->tmp1[0])); |
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if (!s->tmp1) |
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return AVERROR(ENOMEM); |
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s->tmp2 = av_malloc_array(avctx->width / 2, sizeof(s->tmp2[0])); |
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if (!s->tmp2) |
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return AVERROR(ENOMEM); |
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avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
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s->frame = av_frame_alloc(); |
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if (!s->frame) |
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return AVERROR(ENOMEM); |
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ff_thread_once(&init_static_once, vqc_init_static_data); |
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return 0; |
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} |
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static int seed_pow1(int x) |
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{ |
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return x >= 1 && x <= 5 ? 1 << x : 0; |
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} |
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static int seed_pow2(int x) |
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{ |
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return x >= 1 && x <= 4 ? 1 << x : 1; |
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} |
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static int bias(int x, int c) |
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{ |
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if (x < 0) |
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return x - c; |
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else if (x > 0) |
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return x + c; |
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else |
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return 0; |
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} |
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static void seed_codebooks(VqcContext * s, const int * seed) |
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{ |
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int book1 = -256 * seed[3]; |
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int book2 = -128 * seed[4]; |
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int book3 = -128 * seed[5]; |
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int book4 = -128 * seed[6]; |
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for (int i = -128; i < 128; i++) { |
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s->codebook[0][(uint8_t)i] = book1; |
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s->codebook[1][(uint8_t)i] = bias(book2, seed[0]); |
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s->codebook[2][(uint8_t)i] = bias(book3, seed[1]); |
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s->codebook[3][(uint8_t)i] = bias(book4, seed[2]); |
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book1 += 2 * seed[3]; |
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book2 += seed[4]; |
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book3 += seed[5]; |
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book4 += seed[6]; |
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} |
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} |
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static void decode_vectors(VqcContext * s, const uint8_t * buf, int size, int width, int height) |
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{ |
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GetBitContext gb; |
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uint8_t * vectors = s->vectors; |
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uint8_t * vectors_end = s->vectors + (width * height * 3) / 2; |
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memset(vectors, 0, 3 * width * height / 2); |
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init_get_bits8(&gb, buf, size); |
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for (int i = 0; i < 3 * width * height / 2 / 32; i++) { |
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uint8_t * dst = vectors; |
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int symbol; |
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*dst++ = get_bits(&gb, 8); |
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*dst++ = get_bits(&gb, 8); |
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while (show_bits(&gb, 2) != 2) { |
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if (dst >= vectors_end - 1) |
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return; |
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if (!show_bits(&gb, 4)) { |
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*dst++ = 0; |
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*dst++ = 0; |
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skip_bits(&gb, 4); |
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continue; |
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} |
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symbol = get_vlc2(&gb, vector_vlc.table, VECTOR_VLC_BITS, 1); |
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switch(symbol) { |
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case SKIP_3: dst += 3; break; |
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case SKIP_4: dst += 4; break; |
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case SKIP_5: dst += 5; break; |
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case SKIP_6: dst += 6; break; |
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case SIGNED_8BIT: *dst++ = get_sbits(&gb, 8); break; |
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case SIGNED_6BIT: *dst++ = get_sbits(&gb, 6); break; |
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default: |
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*dst++ = symbol; |
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} |
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} |
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skip_bits(&gb, 2); |
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vectors += 32; |
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} |
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} |
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static void load_coeffs(VqcContext * s, const uint8_t * v, int width, int coeff_width) |
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{ |
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int16_t * c0 = s->coeff; |
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int16_t * c1 = s->coeff + coeff_width; |
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int16_t * c0_125 = s->coeff + (coeff_width >> 3); |
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int16_t * c1_125 = s->coeff + coeff_width + (coeff_width >> 3); |
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int16_t * c0_25 = s->coeff + (coeff_width >> 2); |
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int16_t * c1_25 = s->coeff + coeff_width + (coeff_width >> 2); |
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int16_t * c0_5 = s->coeff + (coeff_width >> 1); |
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int16_t * c1_5 = s->coeff + coeff_width + (coeff_width >> 1); |
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for (int i = 0; i < width; i++) { |
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c0[0] = s->codebook[0][v[0]]; |
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c0[1] = s->codebook[0][v[1]]; |
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c0 += 2; |
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c1[0] = s->codebook[0][v[2]]; |
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c1[1] = s->codebook[0][v[3]]; |
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c1 += 2; |
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c0_125[0] = s->codebook[1][v[4]]; |
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c0_125[1] = s->codebook[1][v[5]]; |
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c0_125 += 2; |
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c1_125[0] = s->codebook[1][v[6]]; |
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c1_125[1] = s->codebook[1][v[7]]; |
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c1_125 += 2; |
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c0_25[0] = s->codebook[2][v[8]]; |
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c0_25[1] = s->codebook[2][v[9]]; |
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c0_25[2] = s->codebook[2][v[10]]; |
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c0_25[3] = s->codebook[2][v[11]]; |
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c0_25 += 4; |
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c1_25[0] = s->codebook[2][v[12]]; |
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c1_25[1] = s->codebook[2][v[13]]; |
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c1_25[2] = s->codebook[2][v[14]]; |
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c1_25[3] = s->codebook[2][v[15]]; |
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c1_25 += 4; |
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if (v[16] | v[17] | v[18] | v[19]) { |
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c0_5[0] = s->codebook[3][v[16]]; |
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c0_5[1] = s->codebook[3][v[17]]; |
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c0_5[2] = s->codebook[3][v[18]]; |
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c0_5[3] = s->codebook[3][v[19]]; |
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} else { |
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c0_5[0] = c0_5[1] = c0_5[2] = c0_5[3] = 0; |
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} |
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if (v[20] | v[21] | v[22] | v[23]) { |
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c0_5[4] = s->codebook[3][v[20]]; |
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c0_5[5] = s->codebook[3][v[21]]; |
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c0_5[6] = s->codebook[3][v[22]]; |
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c0_5[7] = s->codebook[3][v[23]]; |
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} else { |
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c0_5[4] = c0_5[5] = c0_5[6] = c0_5[7] = 0; |
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} |
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c0_5 += 8; |
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if (v[24] | v[25] | v[26] | v[27]) { |
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c1_5[0] = s->codebook[3][v[24]]; |
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c1_5[1] = s->codebook[3][v[25]]; |
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c1_5[2] = s->codebook[3][v[26]]; |
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c1_5[3] = s->codebook[3][v[27]]; |
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} else { |
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c1_5[0] = c1_5[1] = c1_5[2] = c1_5[3] = 0; |
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} |
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if (v[28] | v[29] | v[30] | v[31]) { |
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c1_5[4] = s->codebook[3][v[28]]; |
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c1_5[5] = s->codebook[3][v[29]]; |
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c1_5[6] = s->codebook[3][v[30]]; |
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c1_5[7] = s->codebook[3][v[31]]; |
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} else { |
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c1_5[4] = c1_5[5] = c1_5[6] = c1_5[7] = 0; |
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} |
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c1_5 += 8; |
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v += 32; |
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} |
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} |
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static void transform1(const int16_t * a, const int16_t * b, int16_t * dst, int width) |
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{ |
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int s0 = a[0] + (b[0] >> 1); |
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for (int i = 0; i < width / 2 - 1; i++) { |
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dst[i * 2] = s0; |
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s0 = a[i + 1] + ((b[i] + b[i + 1]) >> 1); |
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dst[i * 2 + 1] = ((dst[i * 2] + s0) >> 1) - 2 * b[i]; |
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} |
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dst[width - 2] = s0; |
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dst[width - 1] = a[width / 2 - 1] + ((b[width / 2 - 2] - 2 * b[width / 2 - 1]) >> 2) - b[width / 2 - 1]; |
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} |
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static uint8_t clip(int x) |
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{ |
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return x >= -128 ? x <= 127 ? x + 0x80 : 0x00 : 0xFF; |
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} |
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static void transform2(const int16_t * a, const int16_t * b, uint8_t * dst, int width) |
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{ |
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int s0 = a[0] + (b[0] >> 1); |
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int tmp; |
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for (int i = 0; i < width / 2 - 1; i++) { |
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dst[i * 2] = av_clip_uint8(s0 + 0x80); |
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tmp = a[i + 1] + ((b[i] + b[i + 1]) >> 1); |
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dst[i * 2 + 1] = av_clip_uint8(((tmp + s0) >> 1) - 2 * b[i] + 0x80); |
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s0 = tmp; |
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} |
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dst[width - 2] = clip(s0); |
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dst[width - 1] = clip(a[width / 2 - 1] + ((b[width / 2 - 2] - 2 * b[width / 2 - 1]) >> 2) - b[width / 2 - 1]); |
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} |
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static void decode_strip(VqcContext * s, uint8_t * dst, int stride, int width) |
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{ |
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const int16_t * coeff; |
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for (int i = 0; i < width; i++) { |
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int v0 = s->coeff[i]; |
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int v1 = s->coeff[width + i]; |
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s->coeff[i] = v0 - v1; |
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s->coeff[width + i] = v0 + v1; |
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} |
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coeff = s->coeff; |
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transform1(coeff, coeff + width / 8, s->tmp1, width / 4); |
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transform1(s->tmp1, coeff + width / 4, s->tmp2, width / 2); |
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transform2(s->tmp2, coeff + width / 2, dst, width); |
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coeff += width; |
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dst += stride; |
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transform1(coeff, coeff + width / 8, s->tmp1, width / 4); |
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transform1(s->tmp1, coeff + width / 4, s->tmp2, width / 2); |
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transform2(s->tmp2, coeff + width / 2, dst, width); |
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} |
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static void decode_frame(VqcContext * s, int width, int height) |
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{ |
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uint8_t * vectors = s->vectors; |
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uint8_t * y = s->frame->data[0]; |
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uint8_t * u = s->frame->data[1]; |
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uint8_t * v = s->frame->data[2]; |
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for (int j = 0; j < height / 4; j++) { |
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load_coeffs(s, vectors, width / 16, width); |
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decode_strip(s, y, s->frame->linesize[0], width); |
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vectors += 2 * width; |
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y += 2 * s->frame->linesize[0]; |
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load_coeffs(s, vectors, width / 32, width / 2); |
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decode_strip(s, u, s->frame->linesize[1], width / 2); |
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vectors += width; |
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u += 2 * s->frame->linesize[1]; |
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load_coeffs(s, vectors, width / 16, width); |
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decode_strip(s, y, s->frame->linesize[0], width); |
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vectors += 2 * width; |
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y += 2 * s->frame->linesize[0]; |
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load_coeffs(s, vectors, width / 32, width / 2); |
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decode_strip(s, v, s->frame->linesize[2], width / 2); |
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vectors += width; |
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v += 2 * s->frame->linesize[2]; |
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} |
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} |
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static int vqc_decode_frame(AVCodecContext *avctx, AVFrame * rframe, |
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int * got_frame, AVPacket * avpkt) |
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{ |
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VqcContext *s = avctx->priv_data; |
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int ret; |
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const uint8_t * buf = avpkt->data; |
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int cache, seed[7], gamma, contrast; |
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if (avpkt->size < 7) |
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return AVERROR_INVALIDDATA; |
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if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0) |
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return ret; |
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av_log(avctx, AV_LOG_DEBUG, "VQC%d format\n", (buf[2] & 1) + 1); |
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if (((buf[0] >> 1) & 7) != 5) { |
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avpriv_request_sample(avctx, "subversion != 5\n"); |
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return AVERROR_PATCHWELCOME; |
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} |
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cache = AV_RL24(buf + 4); |
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seed[2] = seed_pow1((cache >> 1) & 7); |
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seed[1] = seed_pow1((cache >> 4) & 7); |
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seed[0] = seed_pow1((cache >> 7) & 7); |
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seed[6] = seed_pow2((cache >> 10) & 7); |
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seed[5] = seed_pow2((cache >> 13) & 7); |
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seed[4] = seed_pow2((cache >> 16) & 7); |
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seed[3] = seed_pow2((cache >> 19) & 7); |
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gamma = buf[0] >> 4; |
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contrast = AV_RL16(buf + 2) >> 1; |
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if (gamma || contrast) |
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avpriv_request_sample(avctx, "gamma=0x%x, contrast=0x%x\n", gamma, contrast); |
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seed_codebooks(s, seed); |
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decode_vectors(s, buf + 7, avpkt->size - 7, avctx->width, avctx->height); |
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decode_frame(s, avctx->width, avctx->height); |
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if ((ret = av_frame_ref(rframe, s->frame)) < 0) |
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return ret; |
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*got_frame = 1; |
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return avpkt->size; |
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} |
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static av_cold int vqc_decode_end(AVCodecContext * avctx) |
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{ |
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VqcContext *s = avctx->priv_data; |
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av_freep(&s->vectors); |
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av_freep(&s->coeff); |
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av_freep(&s->tmp1); |
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av_freep(&s->tmp2); |
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av_frame_free(&s->frame); |
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return 0; |
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} |
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const FFCodec ff_vqc_decoder = { |
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.p.name = "vqc", |
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CODEC_LONG_NAME("ViewQuest VQC"), |
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.p.type = AVMEDIA_TYPE_VIDEO, |
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.p.id = AV_CODEC_ID_VQC, |
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.priv_data_size = sizeof(VqcContext), |
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.init = vqc_decode_init, |
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.close = vqc_decode_end, |
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FF_CODEC_DECODE_CB(vqc_decode_frame), |
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.p.capabilities = AV_CODEC_CAP_DR1, |
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP, |
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}; |
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