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Add a function to parse Dirac's sequence header
Originally committed as revision 21127 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
David Conrad
parent
c4dffe7e36
commit
66b0255248
284
libavcodec/dirac.c
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284
libavcodec/dirac.c
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/*
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* Copyright (C) 2007 Marco Gerards <marco@gnu.org>
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* Copyright (C) 2009 David Conrad
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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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/**
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* @file libavcodec/dirac.c
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* Dirac Decoder
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* @author Marco Gerards <marco@gnu.org>
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*/
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#include "dirac.h"
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#include "avcodec.h"
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#include "golomb.h"
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#include "mpeg12data.h"
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// defaults for source parameters
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static const dirac_source_params dirac_source_parameters_defaults[] = {
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{ 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 },
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{ 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 },
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{ 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 },
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{ 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 },
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{ 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 },
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{ 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 },
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{ 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 },
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{ 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 },
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{ 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 },
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{ 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 },
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{ 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 },
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{ 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 },
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{ 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 },
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{ 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 },
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{ 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 },
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{ 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 },
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{ 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 },
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{ 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
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{ 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
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{ 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
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{ 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
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};
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static const AVRational dirac_preset_aspect_ratios[] = {
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{1, 1},
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{10, 11},
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{12, 11},
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{40, 33},
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{16, 11},
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{4, 3},
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};
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static const AVRational dirac_frame_rate[] = {
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{15000, 1001},
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{25, 2},
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};
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static const struct {
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uint8_t bitdepth;
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enum AVColorRange color_range;
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} pixel_range_presets[] = {
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{8, AVCOL_RANGE_JPEG},
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{8, AVCOL_RANGE_MPEG},
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{10, AVCOL_RANGE_MPEG},
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{12, AVCOL_RANGE_MPEG},
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};
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static const enum AVColorPrimaries dirac_primaries[] = {
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AVCOL_PRI_BT709,
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AVCOL_PRI_SMPTE170M,
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AVCOL_PRI_BT470BG,
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};
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static const struct {
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enum AVColorPrimaries color_primaries;
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enum AVColorSpace colorspace;
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enum AVColorTransferCharacteristic color_trc;
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} dirac_color_presets[] = {
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{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
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{ AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
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{ AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
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{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
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{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ },
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};
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static const enum PixelFormat dirac_pix_fmt[2][3] = {
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{ PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P },
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{ PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P },
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};
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static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
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dirac_source_params *source)
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{
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AVRational frame_rate = (AVRational){0,0};
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unsigned luma_depth = 8, luma_offset = 16;
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int idx;
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if (get_bits1(gb)) {
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source->width = svq3_get_ue_golomb(gb);
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source->height = svq3_get_ue_golomb(gb);
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}
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// chroma subsampling
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if (get_bits1(gb))
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source->chroma_format = svq3_get_ue_golomb(gb);
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if (source->chroma_format > 2) {
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av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
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source->chroma_format);
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return -1;
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}
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if (get_bits1(gb))
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source->interlaced = svq3_get_ue_golomb(gb);
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if (source->interlaced > 1)
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return -1;
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// frame rate
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if (get_bits1(gb)) {
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source->frame_rate_index = svq3_get_ue_golomb(gb);
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if (source->frame_rate_index > 10)
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return -1;
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if (!source->frame_rate_index) {
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frame_rate.num = svq3_get_ue_golomb(gb);
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frame_rate.den = svq3_get_ue_golomb(gb);
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}
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}
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if (source->frame_rate_index > 0) {
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if (source->frame_rate_index <= 8)
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frame_rate = ff_frame_rate_tab[source->frame_rate_index];
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else
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frame_rate = dirac_frame_rate[source->frame_rate_index-9];
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}
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av_reduce(&avctx->time_base.num, &avctx->time_base.den,
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frame_rate.den, frame_rate.num, 1<<30);
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// aspect ratio
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if (get_bits1(gb)) {
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source->aspect_ratio_index = svq3_get_ue_golomb(gb);
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if (source->aspect_ratio_index > 6)
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return -1;
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if (!source->aspect_ratio_index) {
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avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
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avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
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}
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}
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if (source->aspect_ratio_index > 0)
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avctx->sample_aspect_ratio =
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dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
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if (get_bits1(gb)) {
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source->clean_width = svq3_get_ue_golomb(gb);
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source->clean_height = svq3_get_ue_golomb(gb);
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source->clean_left_offset = svq3_get_ue_golomb(gb);
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source->clean_right_offset = svq3_get_ue_golomb(gb);
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}
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// Override signal range.
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if (get_bits1(gb)) {
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source->pixel_range_index = svq3_get_ue_golomb(gb);
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if (source->pixel_range_index > 4)
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return -1;
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// This assumes either fullrange or MPEG levels only
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if (!source->pixel_range_index) {
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luma_offset = svq3_get_ue_golomb(gb);
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luma_depth = av_log2(svq3_get_ue_golomb(gb))+1;
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svq3_get_ue_golomb(gb); // chroma offset
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svq3_get_ue_golomb(gb); // chroma excursion
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avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
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}
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}
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if (source->pixel_range_index > 0) {
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idx = source->pixel_range_index-1;
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luma_depth = pixel_range_presets[idx].bitdepth;
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avctx->color_range = pixel_range_presets[idx].color_range;
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}
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if (luma_depth > 8)
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av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8");
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avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
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// color spec
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if (get_bits1(gb)) {
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idx = source->color_spec_index = svq3_get_ue_golomb(gb);
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if (source->color_spec_index > 4)
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return -1;
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avctx->color_primaries = dirac_color_presets[idx].color_primaries;
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avctx->colorspace = dirac_color_presets[idx].colorspace;
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avctx->color_trc = dirac_color_presets[idx].color_trc;
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if (!source->color_spec_index) {
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if (get_bits1(gb)) {
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idx = svq3_get_ue_golomb(gb);
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if (idx < 3)
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avctx->color_primaries = dirac_primaries[idx];
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}
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if (get_bits1(gb)) {
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idx = svq3_get_ue_golomb(gb);
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if (!idx)
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avctx->colorspace = AVCOL_SPC_BT709;
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else if (idx == 1)
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avctx->colorspace = AVCOL_SPC_BT470BG;
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}
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if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
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avctx->color_trc = AVCOL_TRC_BT709;
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}
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} else {
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idx = source->color_spec_index;
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avctx->color_primaries = dirac_color_presets[idx].color_primaries;
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avctx->colorspace = dirac_color_presets[idx].colorspace;
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avctx->color_trc = dirac_color_presets[idx].color_trc;
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}
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return 0;
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}
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int ff_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
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dirac_source_params *source)
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{
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unsigned version_major, version_minor;
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unsigned video_format, picture_coding_mode;
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version_major = svq3_get_ue_golomb(gb);
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version_minor = svq3_get_ue_golomb(gb);
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avctx->profile = svq3_get_ue_golomb(gb);
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avctx->level = svq3_get_ue_golomb(gb);
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video_format = svq3_get_ue_golomb(gb);
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if (version_major < 2)
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av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
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else if (version_major > 2)
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av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
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if (video_format > 20)
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return -1;
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// Fill in defaults for the source parameters.
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*source = dirac_source_parameters_defaults[video_format];
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// Override the defaults.
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if (parse_source_parameters(avctx, gb, source))
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return -1;
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if (avcodec_check_dimensions(avctx, source->width, source->height))
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return -1;
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avcodec_set_dimensions(avctx, source->width, source->height);
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// currently only used to signal field coding
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picture_coding_mode = svq3_get_ue_golomb(gb);
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if (picture_coding_mode != 0) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
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picture_coding_mode);
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return -1;
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}
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return 0;
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}
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57
libavcodec/dirac.h
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57
libavcodec/dirac.h
Normal file
@ -0,0 +1,57 @@
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/*
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* Copyright (C) 2007 Marco Gerards <marco@gnu.org>
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* Copyright (C) 2009 David Conrad
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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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#ifndef AVCODEC_DIRAC_H
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#define AVCODEC_DIRAC_H
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/**
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* @file libavcodec/dirac.h
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* Interfaces to Dirac Decoder/Encoder
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* @author Marco Gerards <marco@gnu.org>
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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typedef struct {
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unsigned width;
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unsigned height;
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uint8_t chroma_format; ///< 0: 444 1: 422 2: 420
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uint8_t interlaced;
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uint8_t top_field_first;
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uint8_t frame_rate_index; ///< index into dirac_frame_rate[]
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uint8_t aspect_ratio_index; ///< index into dirac_aspect_ratio[]
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uint16_t clean_width;
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uint16_t clean_height;
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uint16_t clean_left_offset;
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uint16_t clean_right_offset;
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uint8_t pixel_range_index; ///< index into dirac_pixel_range_presets[]
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uint8_t color_spec_index; ///< index into dirac_color_spec_presets[]
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} dirac_source_params;
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int ff_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
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dirac_source_params *source);
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#endif /* AVCODEC_DIRAC_H */
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