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FFmpeg/libavcodec/dirac.c
Jordi Ortiz ca239e1c37 Dirac: Doxygen comments and some formatting enhancements 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2011-10-30 21:50:17 +01:00

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/*
* Copyright (C) 2007 Marco Gerards <marco@gnu.org>
* Copyright (C) 2009 David Conrad
* Copyright (C) 2011 Jordi Ortiz
*
* 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>, David Conrad, Jordi Ortiz <nenjordi@gmail.com>
*/
#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 },
};
/**
* Dirac Specification ->
* Table 10.4 - Available preset pixel aspect ratio values
*/
static const AVRational dirac_preset_aspect_ratios[] = {
{1, 1},
{10, 11},
{12, 11},
{40, 33},
{16, 11},
{4, 3},
};
/**
* Dirac Specification ->
* Values 9,10 of 10.3.5 Frame Rate. Table 10.3 Available preset frame rate values
*/
static const AVRational dirac_frame_rate[] = {
{15000, 1001},
{25, 2},
};
/**
* Dirac Specification ->
* This should be equivalent to Table 10.5 Available signal range presets
*/
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 */ },
};
/**
* Dirac Specification ->
* Table 10.2 Supported chroma sampling formats + Luma Offset
*/
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 },
};
/**
* Dirac Specification ->
* 10.3 Parse Source Parameters. source_parameters(base_video_format)
*/
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;
/* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
if (get_bits1(gb)) { /* [DIRAC_STD] custom_dimensions_flag */
source->width = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH */
source->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
}
/* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
chroma_sampling_format(video_params) */
if (get_bits1(gb)) /* [DIRAC_STD] custom_chroma_format_flag */
source->chroma_format = svq3_get_ue_golomb(gb); /*[DIRAC_STD] CHROMA_FORMAT_INDEX */
if (source->chroma_format > 2U) {
av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
source->chroma_format);
return -1;
}
/* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */
if (get_bits1(gb)) /* [DIRAC_STD] custom_scan_format_flag */
source->interlaced = svq3_get_ue_golomb(gb); /* [DIRAC_STD] SOURCE_SAMPLING */
if (source->interlaced > 1U)
return -1;
/* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
source->frame_rate_index = svq3_get_ue_golomb(gb);
if (source->frame_rate_index > 10U)
return -1;
if (!source->frame_rate_index){
frame_rate.num = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_RATE_NUMER */
frame_rate.den = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_RATE_DENOM */
}
}
if (source->frame_rate_index > 0) { /* [DIRAC_STD] preset_frame_rate(video_params,index) */
if (source->frame_rate_index <= 8)
frame_rate = avpriv_frame_rate_tab[source->frame_rate_index]; /* [DIRAC_STD] Table 10.3 values 1-8 */
else
frame_rate = dirac_frame_rate[source->frame_rate_index-9]; /* [DIRAC_STD] Table 10.3 values 9-10 */
}
av_reduce(&avctx->time_base.num, &avctx->time_base.den,
frame_rate.den, frame_rate.num, 1<<30);
/* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio. pixel_aspect_ratio(video_params) */
if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
source->aspect_ratio_index = svq3_get_ue_golomb(gb); /* [DIRAC_STD] index */
if (source->aspect_ratio_index > 6U)
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) /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel aspect ratio values */
avctx->sample_aspect_ratio =
dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
/* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */
source->clean_width = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_WIDTH */
source->clean_height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_HEIGHT */
source->clean_left_offset = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
source->clean_right_offset = svq3_get_ue_golomb(gb); /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
}
/*[DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
WARNING: Some adaptation seemed to be done using the AVCOL_RANGE_MPEG/JPEG values */
if (get_bits1(gb)) { /*[DIRAC_STD] custom_signal_range_flag */
source->pixel_range_index = svq3_get_ue_golomb(gb); /*[DIRAC_STD] index */
if (source->pixel_range_index > 4U)
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 @Jordi: Why are these two ignored? */
svq3_get_ue_golomb(gb); /* chroma excursion */
avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
}
}
if (source->pixel_range_index > 0) { /*[DIRAC_STD] Take values from Table 10.5 Available signal range presets */
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];
/* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
idx = source->color_spec_index = svq3_get_ue_golomb(gb); /* [DIRAC_STD] index */
if (source->color_spec_index > 4U)
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) {
/* [DIRAC_STD] 10.3.9.1 Color primaries */
if (get_bits1(gb)) {
idx = svq3_get_ue_golomb(gb);
if (idx < 3U)
avctx->color_primaries = dirac_primaries[idx];
}
/* [DIRAC_STD] 10.3.9.2 Color matrix */
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;
}
/* [DIRAC_STD] 10.3.9.3 Transfer function */
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;
}
/**
* Dirac Specification ->
* 10. Sequence Header. sequence_header()
*/
int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
dirac_source_params *source)
{
unsigned version_major;
unsigned video_format, picture_coding_mode;
/* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
version_major = svq3_get_ue_golomb(gb);
svq3_get_ue_golomb(gb); /* version_minor */
avctx->profile = svq3_get_ue_golomb(gb);
avctx->level = svq3_get_ue_golomb(gb);
/* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in
10.2 Base Video Format, table 10.1 Dirac predefined video formats */
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 > 20U)
return -1;
/* Fill in defaults for the source parameters. */
*source = dirac_source_parameters_defaults[video_format];
/*[DIRAC_STD] 10.3 Source Parameters
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);
/*[DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
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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