mirror of
https://github.com/FFmpeg/FFmpeg.git
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737eb5976f
It is pretty hopeless that other considerable projects will adopt libavutil alone in other projects. Projects that need small footprint are better off with more specialized libraries such as gnulib or rather just copy the necessary parts that they need. With this in mind, nobody is helped by having libavutil and libavcore split. In order to ease maintenance inside and around FFmpeg and to reduce confusion where to put common code, avcore's functionality is merged (back) to avutil. Signed-off-by: Reinhard Tartler <siretart@tauware.de>
286 lines
9.5 KiB
C
286 lines
9.5 KiB
C
/*
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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
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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 "libavutil/imgutils.h"
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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 (av_image_check_size(source->width, source->height, 0, avctx))
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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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