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FFmpeg/libavcodec/dirac.c
Reinhard Tartler 737eb5976f Merge libavcore into libavutil 
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>
2011-02-15 16:18:21 +01:00

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/*
* Copyright (C) 2007 Marco Gerards <marco@gnu.org>
* Copyright (C) 2009 David Conrad
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Dirac Decoder
* @author Marco Gerards <marco@gnu.org>
*/
#include "libavutil/imgutils.h"
#include "dirac.h"
#include "avcodec.h"
#include "golomb.h"
#include "mpeg12data.h"
// defaults for source parameters
static const dirac_source_params dirac_source_parameters_defaults[] = {
{ 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 },
{ 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 },
{ 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 },
{ 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 },
{ 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 },
{ 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 },
{ 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 },
{ 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 },
{ 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 },
{ 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 },
{ 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 },
{ 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 },
{ 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 },
{ 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 },
{ 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 },
{ 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 },
{ 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 },
{ 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
{ 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
{ 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
{ 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
};
static const AVRational dirac_preset_aspect_ratios[] = {
{1, 1},
{10, 11},
{12, 11},
{40, 33},
{16, 11},
{4, 3},
};
static const AVRational dirac_frame_rate[] = {
{15000, 1001},
{25, 2},
};
static const struct {
uint8_t bitdepth;
enum AVColorRange color_range;
} pixel_range_presets[] = {
{8, AVCOL_RANGE_JPEG},
{8, AVCOL_RANGE_MPEG},
{10, AVCOL_RANGE_MPEG},
{12, AVCOL_RANGE_MPEG},
};
static const enum AVColorPrimaries dirac_primaries[] = {
AVCOL_PRI_BT709,
AVCOL_PRI_SMPTE170M,
AVCOL_PRI_BT470BG,
};
static const struct {
enum AVColorPrimaries color_primaries;
enum AVColorSpace colorspace;
enum AVColorTransferCharacteristic color_trc;
} dirac_color_presets[] = {
{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
{ AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
{ AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ },
};
static const enum PixelFormat dirac_pix_fmt[2][3] = {
{ PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P },
{ PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P },
};
static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
dirac_source_params *source)
{
AVRational frame_rate = (AVRational){0,0};
unsigned luma_depth = 8, luma_offset = 16;
int idx;
if (get_bits1(gb)) {
source->width = svq3_get_ue_golomb(gb);
source->height = svq3_get_ue_golomb(gb);
}
// chroma subsampling
if (get_bits1(gb))
source->chroma_format = svq3_get_ue_golomb(gb);
if (source->chroma_format > 2) {
av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
source->chroma_format);
return -1;
}
if (get_bits1(gb))
source->interlaced = svq3_get_ue_golomb(gb);
if (source->interlaced > 1)
return -1;
// frame rate
if (get_bits1(gb)) {
source->frame_rate_index = svq3_get_ue_golomb(gb);
if (source->frame_rate_index > 10)
return -1;
if (!source->frame_rate_index) {
frame_rate.num = svq3_get_ue_golomb(gb);
frame_rate.den = svq3_get_ue_golomb(gb);
}
}
if (source->frame_rate_index > 0) {
if (source->frame_rate_index <= 8)
frame_rate = ff_frame_rate_tab[source->frame_rate_index];
else
frame_rate = dirac_frame_rate[source->frame_rate_index-9];
}
av_reduce(&avctx->time_base.num, &avctx->time_base.den,
frame_rate.den, frame_rate.num, 1<<30);
// aspect ratio
if (get_bits1(gb)) {
source->aspect_ratio_index = svq3_get_ue_golomb(gb);
if (source->aspect_ratio_index > 6)
return -1;
if (!source->aspect_ratio_index) {
avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
}
}
if (source->aspect_ratio_index > 0)
avctx->sample_aspect_ratio =
dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
if (get_bits1(gb)) {
source->clean_width = svq3_get_ue_golomb(gb);
source->clean_height = svq3_get_ue_golomb(gb);
source->clean_left_offset = svq3_get_ue_golomb(gb);
source->clean_right_offset = svq3_get_ue_golomb(gb);
}
// Override signal range.
if (get_bits1(gb)) {
source->pixel_range_index = svq3_get_ue_golomb(gb);
if (source->pixel_range_index > 4)
return -1;
// This assumes either fullrange or MPEG levels only
if (!source->pixel_range_index) {
luma_offset = svq3_get_ue_golomb(gb);
luma_depth = av_log2(svq3_get_ue_golomb(gb))+1;
svq3_get_ue_golomb(gb); // chroma offset
svq3_get_ue_golomb(gb); // chroma excursion
avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
}
}
if (source->pixel_range_index > 0) {
idx = source->pixel_range_index-1;
luma_depth = pixel_range_presets[idx].bitdepth;
avctx->color_range = pixel_range_presets[idx].color_range;
}
if (luma_depth > 8)
av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8");
avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
// color spec
if (get_bits1(gb)) {
idx = source->color_spec_index = svq3_get_ue_golomb(gb);
if (source->color_spec_index > 4)
return -1;
avctx->color_primaries = dirac_color_presets[idx].color_primaries;
avctx->colorspace = dirac_color_presets[idx].colorspace;
avctx->color_trc = dirac_color_presets[idx].color_trc;
if (!source->color_spec_index) {
if (get_bits1(gb)) {
idx = svq3_get_ue_golomb(gb);
if (idx < 3)
avctx->color_primaries = dirac_primaries[idx];
}
if (get_bits1(gb)) {
idx = svq3_get_ue_golomb(gb);
if (!idx)
avctx->colorspace = AVCOL_SPC_BT709;
else if (idx == 1)
avctx->colorspace = AVCOL_SPC_BT470BG;
}
if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
avctx->color_trc = AVCOL_TRC_BT709;
}
} else {
idx = source->color_spec_index;
avctx->color_primaries = dirac_color_presets[idx].color_primaries;
avctx->colorspace = dirac_color_presets[idx].colorspace;
avctx->color_trc = dirac_color_presets[idx].color_trc;
}
return 0;
}
int ff_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
dirac_source_params *source)
{
unsigned version_major, version_minor;
unsigned video_format, picture_coding_mode;
version_major = svq3_get_ue_golomb(gb);
version_minor = svq3_get_ue_golomb(gb);
avctx->profile = svq3_get_ue_golomb(gb);
avctx->level = svq3_get_ue_golomb(gb);
video_format = svq3_get_ue_golomb(gb);
if (version_major < 2)
av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
else if (version_major > 2)
av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
if (video_format > 20)
return -1;
// Fill in defaults for the source parameters.
*source = dirac_source_parameters_defaults[video_format];
// Override the defaults.
if (parse_source_parameters(avctx, gb, source))
return -1;
if (av_image_check_size(source->width, source->height, 0, avctx))
return -1;
avcodec_set_dimensions(avctx, source->width, source->height);
// currently only used to signal field coding
picture_coding_mode = svq3_get_ue_golomb(gb);
if (picture_coding_mode != 0) {
av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
picture_coding_mode);
return -1;
}
return 0;
}
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