/src/ffmpeg/libavcodec/dirac.c

Source
/*
 * 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 "config.h"

#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"

#include "dirac.h"
#include "get_bits.h"
#include "golomb.h"
#include "mpeg12data.h"

#if CONFIG_DIRAC_PARSE

typedef struct dirac_source_params {
    unsigned width;
    unsigned height;
    uint8_t chroma_format;          ///< 0: 444  1: 422  2: 420

    uint8_t interlaced;
    uint8_t top_field_first;

    uint8_t frame_rate_index;       ///< index into dirac_frame_rate[]
    uint8_t aspect_ratio_index;     ///< index into dirac_aspect_ratio[]

    uint16_t clean_width;
    uint16_t clean_height;
    uint16_t clean_left_offset;
    uint16_t clean_right_offset;

    uint8_t pixel_range_index;      ///< index into dirac_pixel_range_presets[]
    uint8_t color_spec_index;       ///< index into dirac_color_spec_presets[]
} dirac_source_params;

/* 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_STD] 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_STD] 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_STD] 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_STD] Table 10.2 Supported chroma sampling formats */
static const enum AVPixelFormat dirac_pix_fmt[][3] = {
    {AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12},
    {AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12},
    {AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12},
};

/* [DIRAC_STD] 10.3 Parse Source Parameters.
 * source_parameters(base_video_format) */
static int parse_source_parameters(AVDiracSeqHeader *dsh, GetBitContext *gb,
                                   void *log_ctx)
{
    AVRational frame_rate = { 0, 0 };
    unsigned luma_depth = 8, luma_offset = 16;
    int idx;
    int chroma_x_shift, chroma_y_shift;
    int ret;

    /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
    /* [DIRAC_STD] custom_dimensions_flag */
    if (get_bits1(gb)) {
        dsh->width  = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH  */
        dsh->height = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
    }

    /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
     *  chroma_sampling_format(video_params) */
    /* [DIRAC_STD] custom_chroma_format_flag */
    if (get_bits1(gb))
        /* [DIRAC_STD] CHROMA_FORMAT_INDEX */
        dsh->chroma_format = get_interleaved_ue_golomb(gb);
    if (dsh->chroma_format > 2U) {
        if (log_ctx)
            av_log(log_ctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
                   dsh->chroma_format);
        return AVERROR_INVALIDDATA;
    }

    /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */
    /* [DIRAC_STD] custom_scan_format_flag */
    if (get_bits1(gb))
        /* [DIRAC_STD] SOURCE_SAMPLING */
        dsh->interlaced = get_interleaved_ue_golomb(gb);
    if (dsh->interlaced > 1U)
        return AVERROR_INVALIDDATA;

    /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
    if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
        dsh->frame_rate_index = get_interleaved_ue_golomb(gb);

        if (dsh->frame_rate_index > 10U)
            return AVERROR_INVALIDDATA;

        if (!dsh->frame_rate_index) {
            /* [DIRAC_STD] FRAME_RATE_NUMER */
            frame_rate.num = get_interleaved_ue_golomb(gb);
            /* [DIRAC_STD] FRAME_RATE_DENOM */
            frame_rate.den = get_interleaved_ue_golomb(gb);
        }
    }
    /* [DIRAC_STD] preset_frame_rate(video_params, index) */
    if (dsh->frame_rate_index > 0) {
        if (dsh->frame_rate_index <= 8)
            frame_rate = ff_mpeg12_frame_rate_tab[dsh->frame_rate_index];
        else
            /* [DIRAC_STD] Table 10.3 values 9-10 */
            frame_rate = dirac_frame_rate[dsh->frame_rate_index - 9];
    }
    dsh->framerate = frame_rate;

    /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
     * pixel_aspect_ratio(video_params) */
    if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
        /* [DIRAC_STD] index */
        dsh->aspect_ratio_index = get_interleaved_ue_golomb(gb);

        if (dsh->aspect_ratio_index > 6U)
            return AVERROR_INVALIDDATA;

        if (!dsh->aspect_ratio_index) {
            dsh->sample_aspect_ratio.num = get_interleaved_ue_golomb(gb);
            dsh->sample_aspect_ratio.den = get_interleaved_ue_golomb(gb);
        }
    }
    /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
     *  aspect ratio values */
    if (dsh->aspect_ratio_index > 0)
        dsh->sample_aspect_ratio =
            dirac_preset_aspect_ratios[dsh->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 */
        /* [DIRAC_STD] CLEAN_WIDTH */
        dsh->clean_width = get_interleaved_ue_golomb(gb);
        /* [DIRAC_STD] CLEAN_HEIGHT */
        dsh->clean_height = get_interleaved_ue_golomb(gb);
        /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
        dsh->clean_left_offset = get_interleaved_ue_golomb(gb);
        /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
        dsh->clean_right_offset = get_interleaved_ue_golomb(gb);
    }

    /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
     * WARNING: Some adaptation seems to be done using the
     * AVCOL_RANGE_MPEG/JPEG values */
    if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
        /* [DIRAC_STD] index */
        dsh->pixel_range_index = get_interleaved_ue_golomb(gb);

        if (dsh->pixel_range_index > 4U)
            return AVERROR_INVALIDDATA;

        /* This assumes either fullrange or MPEG levels only */
        if (!dsh->pixel_range_index) {
            luma_offset = get_interleaved_ue_golomb(gb);
            luma_depth  = av_log2(get_interleaved_ue_golomb(gb)) + 1;
            get_interleaved_ue_golomb(gb); /* chroma offset    */
            get_interleaved_ue_golomb(gb); /* chroma excursion */
            dsh->color_range = luma_offset ? AVCOL_RANGE_MPEG
                                           : AVCOL_RANGE_JPEG;
        }
    }
    /* [DIRAC_STD] Table 10.5
     * Available signal range presets <--> pixel_range_presets */
    if (dsh->pixel_range_index > 0) {
        idx                = dsh->pixel_range_index - 1;
        luma_depth         = pixel_range_presets[idx].bitdepth;
        dsh->color_range   = pixel_range_presets[idx].color_range;
    }

    dsh->bit_depth = luma_depth;

    /* Full range 8 bts uses the same pix_fmts as limited range 8 bits */
    dsh->pixel_range_index += dsh->pixel_range_index == 1;

    if (dsh->pixel_range_index < 2U)
        return AVERROR_INVALIDDATA;

    dsh->pix_fmt = dirac_pix_fmt[dsh->chroma_format][dsh->pixel_range_index-2];
    ret = av_pix_fmt_get_chroma_sub_sample(dsh->pix_fmt, &chroma_x_shift, &chroma_y_shift);
    if (ret)
        return ret;

    if ((dsh->width % (1<<chroma_x_shift)) || (dsh->height % (1<<chroma_y_shift))) {
        if (log_ctx)
            av_log(log_ctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n");
        return AVERROR_INVALIDDATA;
    }

    /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
    if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
        /* [DIRAC_STD] index */
        idx = dsh->color_spec_index = get_interleaved_ue_golomb(gb);

        if (dsh->color_spec_index > 4U)
            return AVERROR_INVALIDDATA;

        dsh->color_primaries = dirac_color_presets[idx].color_primaries;
        dsh->colorspace      = dirac_color_presets[idx].colorspace;
        dsh->color_trc       = dirac_color_presets[idx].color_trc;

        if (!dsh->color_spec_index) {
            /* [DIRAC_STD] 10.3.9.1 Colour primaries */
            if (get_bits1(gb)) {
                idx = get_interleaved_ue_golomb(gb);
                if (idx < 3U)
                    dsh->color_primaries = dirac_primaries[idx];
            }
            /* [DIRAC_STD] 10.3.9.2 Colour matrix */
            if (get_bits1(gb)) {
                idx = get_interleaved_ue_golomb(gb);
                if (!idx)
                    dsh->colorspace = AVCOL_SPC_BT709;
                else if (idx == 1)
                    dsh->colorspace = AVCOL_SPC_BT470BG;
            }
            /* [DIRAC_STD] 10.3.9.3 Transfer function */
            if (get_bits1(gb) && !get_interleaved_ue_golomb(gb))
                dsh->color_trc = AVCOL_TRC_BT709;
        }
    } else {
        idx                    = dsh->color_spec_index;
        dsh->color_primaries = dirac_color_presets[idx].color_primaries;
        dsh->colorspace      = dirac_color_presets[idx].colorspace;
        dsh->color_trc       = dirac_color_presets[idx].color_trc;
    }

    return 0;
}

/* [DIRAC_STD] 10. Sequence Header. sequence_header() */
int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
                                   const uint8_t *buf, size_t buf_size,
                                   void *log_ctx)
{
    AVDiracSeqHeader *dsh;
    GetBitContext gb;
    unsigned video_format, picture_coding_mode;
    int ret;

    dsh = av_mallocz(sizeof(*dsh));
    if (!dsh)
        return AVERROR(ENOMEM);

    ret = init_get_bits8(&gb, buf, buf_size);
    if (ret < 0)
        goto fail;

    /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
    dsh->version.major = get_interleaved_ue_golomb(&gb);
    dsh->version.minor = get_interleaved_ue_golomb(&gb);
    dsh->profile   = get_interleaved_ue_golomb(&gb);
    dsh->level     = get_interleaved_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 = get_interleaved_ue_golomb(&gb);

    if (dsh->version.major < 2 && log_ctx)
        av_log(log_ctx, AV_LOG_WARNING, "Stream is old and may not work\n");
    else if (dsh->version.major > 2 && log_ctx)
        av_log(log_ctx, AV_LOG_WARNING, "Stream may have unhandled features\n");

    if (video_format > 20U) {
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    /* Fill in defaults for the source parameters. */
    dsh->width              = dirac_source_parameters_defaults[video_format].width;
    dsh->height             = dirac_source_parameters_defaults[video_format].height;
    dsh->chroma_format      = dirac_source_parameters_defaults[video_format].chroma_format;
    dsh->interlaced         = dirac_source_parameters_defaults[video_format].interlaced;
    dsh->top_field_first    = dirac_source_parameters_defaults[video_format].top_field_first;
    dsh->frame_rate_index   = dirac_source_parameters_defaults[video_format].frame_rate_index;
    dsh->aspect_ratio_index = dirac_source_parameters_defaults[video_format].aspect_ratio_index;
    dsh->clean_width        = dirac_source_parameters_defaults[video_format].clean_width;
    dsh->clean_height       = dirac_source_parameters_defaults[video_format].clean_height;
    dsh->clean_left_offset  = dirac_source_parameters_defaults[video_format].clean_left_offset;
    dsh->clean_right_offset = dirac_source_parameters_defaults[video_format].clean_right_offset;
    dsh->pixel_range_index  = dirac_source_parameters_defaults[video_format].pixel_range_index;
    dsh->color_spec_index   = dirac_source_parameters_defaults[video_format].color_spec_index;

    /* [DIRAC_STD] 10.3 Source Parameters
     * Override the defaults. */
    ret = parse_source_parameters(dsh, &gb, log_ctx);
    if (ret < 0)
        goto fail;

    /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
     * currently only used to signal field coding */
    picture_coding_mode = get_interleaved_ue_golomb(&gb);
    if (picture_coding_mode != 0) {
        if (log_ctx) {
            av_log(log_ctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
                   picture_coding_mode);
        }
        ret = AVERROR_INVALIDDATA;
        goto fail;
    }

    *pdsh = dsh;
    return 0;
fail:
    av_freep(&dsh);
    *pdsh = NULL;
    return ret;
}
#else
int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
                                   const uint8_t *buf, size_t buf_size,
                                   void *log_ctx)
{
    return AVERROR(ENOSYS);
}
#endif

Coverage Report

Created: 2026-01-16 07:48

Line	Count	Source
1		/*
2		* Copyright (C) 2007 Marco Gerards <marco@gnu.org>
3		* Copyright (C) 2009 David Conrad
4		* Copyright (C) 2011 Jordi Ortiz
5		*
6		* This file is part of FFmpeg.
7		*
8		* FFmpeg is free software; you can redistribute it and/or
9		* modify it under the terms of the GNU Lesser General Public
10		* License as published by the Free Software Foundation; either
11		* version 2.1 of the License, or (at your option) any later version.
12		*
13		* FFmpeg is distributed in the hope that it will be useful,
14		* but WITHOUT ANY WARRANTY; without even the implied warranty of
15		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16		* Lesser General Public License for more details.
17		*
18		* You should have received a copy of the GNU Lesser General Public
19		* License along with FFmpeg; if not, write to the Free Software
20		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21		*/
22
23		/**
24		* @file
25		* Dirac Decoder
26		* @author Marco Gerards <marco@gnu.org>, David Conrad, Jordi Ortiz <nenjordi@gmail.com>
27		*/
28
29		#include "config.h"
30
31		#include "libavutil/mem.h"
32		#include "libavutil/pixdesc.h"
33
34		#include "dirac.h"
35		#include "get_bits.h"
36		#include "golomb.h"
37		#include "mpeg12data.h"
38
39		#if CONFIG_DIRAC_PARSE
40
41		typedef struct dirac_source_params {
42		unsigned width;
43		unsigned height;
44		uint8_t chroma_format; ///< 0: 444 1: 422 2: 420
45
46		uint8_t interlaced;
47		uint8_t top_field_first;
48
49		uint8_t frame_rate_index; ///< index into dirac_frame_rate[]
50		uint8_t aspect_ratio_index; ///< index into dirac_aspect_ratio[]
51
52		uint16_t clean_width;
53		uint16_t clean_height;
54		uint16_t clean_left_offset;
55		uint16_t clean_right_offset;
56
57		uint8_t pixel_range_index; ///< index into dirac_pixel_range_presets[]
58		uint8_t color_spec_index; ///< index into dirac_color_spec_presets[]
59		} dirac_source_params;
60
61		/* defaults for source parameters */
62		static const dirac_source_params dirac_source_parameters_defaults[] = {
63		{ 640, 480, 2, 0, 0, 1, 1, 640, 480, 0, 0, 1, 0 },
64		{ 176, 120, 2, 0, 0, 9, 2, 176, 120, 0, 0, 1, 1 },
65		{ 176, 144, 2, 0, 1, 10, 3, 176, 144, 0, 0, 1, 2 },
66		{ 352, 240, 2, 0, 0, 9, 2, 352, 240, 0, 0, 1, 1 },
67		{ 352, 288, 2, 0, 1, 10, 3, 352, 288, 0, 0, 1, 2 },
68		{ 704, 480, 2, 0, 0, 9, 2, 704, 480, 0, 0, 1, 1 },
69		{ 704, 576, 2, 0, 1, 10, 3, 704, 576, 0, 0, 1, 2 },
70		{ 720, 480, 1, 1, 0, 4, 2, 704, 480, 8, 0, 3, 1 },
71		{ 720, 576, 1, 1, 1, 3, 3, 704, 576, 8, 0, 3, 2 },
72
73		{ 1280, 720, 1, 0, 1, 7, 1, 1280, 720, 0, 0, 3, 3 },
74		{ 1280, 720, 1, 0, 1, 6, 1, 1280, 720, 0, 0, 3, 3 },
75		{ 1920, 1080, 1, 1, 1, 4, 1, 1920, 1080, 0, 0, 3, 3 },
76		{ 1920, 1080, 1, 1, 1, 3, 1, 1920, 1080, 0, 0, 3, 3 },
77		{ 1920, 1080, 1, 0, 1, 7, 1, 1920, 1080, 0, 0, 3, 3 },
78		{ 1920, 1080, 1, 0, 1, 6, 1, 1920, 1080, 0, 0, 3, 3 },
79		{ 2048, 1080, 0, 0, 1, 2, 1, 2048, 1080, 0, 0, 4, 4 },
80		{ 4096, 2160, 0, 0, 1, 2, 1, 4096, 2160, 0, 0, 4, 4 },
81
82		{ 3840, 2160, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
83		{ 3840, 2160, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
84		{ 7680, 4320, 1, 0, 1, 7, 1, 3840, 2160, 0, 0, 3, 3 },
85		{ 7680, 4320, 1, 0, 1, 6, 1, 3840, 2160, 0, 0, 3, 3 },
86		};
87
88		/* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */
89		static const AVRational dirac_preset_aspect_ratios[] = {
90		{ 1, 1 },
91		{ 10, 11 },
92		{ 12, 11 },
93		{ 40, 33 },
94		{ 16, 11 },
95		{ 4, 3 },
96		};
97
98		/* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate.
99		* Table 10.3 Available preset frame rate values
100		*/
101		static const AVRational dirac_frame_rate[] = {
102		{ 15000, 1001 },
103		{ 25, 2 },
104		};
105
106		/* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal
107		* range presets */
108		static const struct {
109		uint8_t bitdepth;
110		enum AVColorRange color_range;
111		} pixel_range_presets[] = {
112		{ 8, AVCOL_RANGE_JPEG },
113		{ 8, AVCOL_RANGE_MPEG },
114		{ 10, AVCOL_RANGE_MPEG },
115		{ 12, AVCOL_RANGE_MPEG },
116		};
117
118		static const enum AVColorPrimaries dirac_primaries[] = {
119		AVCOL_PRI_BT709,
120		AVCOL_PRI_SMPTE170M,
121		AVCOL_PRI_BT470BG,
122		};
123
124		static const struct {
125		enum AVColorPrimaries color_primaries;
126		enum AVColorSpace colorspace;
127		enum AVColorTransferCharacteristic color_trc;
128		} dirac_color_presets[] = {
129		{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
130		{ AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
131		{ AVCOL_PRI_BT470BG, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
132		{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_BT709 },
133		{ AVCOL_PRI_BT709, AVCOL_SPC_BT709, AVCOL_TRC_UNSPECIFIED /* DCinema */ },
134		};
135
136		/* [DIRAC_STD] Table 10.2 Supported chroma sampling formats */
137		static const enum AVPixelFormat dirac_pix_fmt[][3] = {
138		{AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV444P12},
139		{AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV422P12},
140		{AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P10, AV_PIX_FMT_YUV420P12},
141		};
142
143		/* [DIRAC_STD] 10.3 Parse Source Parameters.
144		* source_parameters(base_video_format) */
145		static int parse_source_parameters(AVDiracSeqHeader dsh, GetBitContext gb,
146		void *log_ctx)
147	33.0k	{
148	33.0k	AVRational frame_rate = { 0, 0 };
149	33.0k	unsigned luma_depth = 8, luma_offset = 16;
150	33.0k	int idx;
151	33.0k	int chroma_x_shift, chroma_y_shift;
152	33.0k	int ret;
153
154		/* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
155		/* [DIRAC_STD] custom_dimensions_flag */
156	33.0k	if (get_bits1(gb)) {
157	20.3k	dsh->width = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH */
158	20.3k	dsh->height = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
159	20.3k	}
160
161		/* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
162		* chroma_sampling_format(video_params) */
163		/* [DIRAC_STD] custom_chroma_format_flag */
164	33.0k	if (get_bits1(gb))
165		/* [DIRAC_STD] CHROMA_FORMAT_INDEX */
166	14.6k	dsh->chroma_format = get_interleaved_ue_golomb(gb);
167	33.0k	if (dsh->chroma_format > 2U) {
168	1.36k	if (log_ctx)
169	1.36k	av_log(log_ctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
170	1.36k	dsh->chroma_format);
171	1.36k	return AVERROR_INVALIDDATA;
172	1.36k	}
173
174		/* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */
175		/* [DIRAC_STD] custom_scan_format_flag */
176	31.6k	if (get_bits1(gb))
177		/* [DIRAC_STD] SOURCE_SAMPLING */
178	11.2k	dsh->interlaced = get_interleaved_ue_golomb(gb);
179	31.6k	if (dsh->interlaced > 1U)
180	1.09k	return AVERROR_INVALIDDATA;
181
182		/* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
183	30.6k	if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
184	15.7k	dsh->frame_rate_index = get_interleaved_ue_golomb(gb);
185
186	15.7k	if (dsh->frame_rate_index > 10U)
187	852	return AVERROR_INVALIDDATA;
188
189	14.8k	if (!dsh->frame_rate_index) {
190		/* [DIRAC_STD] FRAME_RATE_NUMER */
191	7.68k	frame_rate.num = get_interleaved_ue_golomb(gb);
192		/* [DIRAC_STD] FRAME_RATE_DENOM */
193	7.68k	frame_rate.den = get_interleaved_ue_golomb(gb);
194	7.68k	}
195	14.8k	}
196		/* [DIRAC_STD] preset_frame_rate(video_params, index) */
197	29.7k	if (dsh->frame_rate_index > 0) {
198	22.0k	if (dsh->frame_rate_index <= 8)
199	17.0k	frame_rate = ff_mpeg12_frame_rate_tab[dsh->frame_rate_index];
200	5.01k	else
201		/* [DIRAC_STD] Table 10.3 values 9-10 */
202	5.01k	frame_rate = dirac_frame_rate[dsh->frame_rate_index - 9];
203	22.0k	}
204	29.7k	dsh->framerate = frame_rate;
205
206		/* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
207		* pixel_aspect_ratio(video_params) */
208	29.7k	if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
209		/* [DIRAC_STD] index */
210	11.3k	dsh->aspect_ratio_index = get_interleaved_ue_golomb(gb);
211
212	11.3k	if (dsh->aspect_ratio_index > 6U)
213	976	return AVERROR_INVALIDDATA;
214
215	10.3k	if (!dsh->aspect_ratio_index) {
216	5.99k	dsh->sample_aspect_ratio.num = get_interleaved_ue_golomb(gb);
217	5.99k	dsh->sample_aspect_ratio.den = get_interleaved_ue_golomb(gb);
218	5.99k	}
219	10.3k	}
220		/* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
221		* aspect ratio values */
222	28.7k	if (dsh->aspect_ratio_index > 0)
223	22.7k	dsh->sample_aspect_ratio =
224	22.7k	dirac_preset_aspect_ratios[dsh->aspect_ratio_index - 1];
225
226		/* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
227	28.7k	if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */
228		/* [DIRAC_STD] CLEAN_WIDTH */
229	8.87k	dsh->clean_width = get_interleaved_ue_golomb(gb);
230		/* [DIRAC_STD] CLEAN_HEIGHT */
231	8.87k	dsh->clean_height = get_interleaved_ue_golomb(gb);
232		/* [DIRAC_STD] CLEAN_LEFT_OFFSET */
233	8.87k	dsh->clean_left_offset = get_interleaved_ue_golomb(gb);
234		/* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
235	8.87k	dsh->clean_right_offset = get_interleaved_ue_golomb(gb);
236	8.87k	}
237
238		/* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
239		* WARNING: Some adaptation seems to be done using the
240		* AVCOL_RANGE_MPEG/JPEG values */
241	28.7k	if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
242		/* [DIRAC_STD] index */
243	7.95k	dsh->pixel_range_index = get_interleaved_ue_golomb(gb);
244
245	7.95k	if (dsh->pixel_range_index > 4U)
246	956	return AVERROR_INVALIDDATA;
247
248		/* This assumes either fullrange or MPEG levels only */
249	6.99k	if (!dsh->pixel_range_index) {
250	2.29k	luma_offset = get_interleaved_ue_golomb(gb);
251	2.29k	luma_depth = av_log2(get_interleaved_ue_golomb(gb)) + 1;
252	2.29k	get_interleaved_ue_golomb(gb); /* chroma offset */
253	2.29k	get_interleaved_ue_golomb(gb); /* chroma excursion */
254	2.29k	dsh->color_range = luma_offset ? AVCOL_RANGE_MPEG
255	2.29k	: AVCOL_RANGE_JPEG;
256	2.29k	}
257	6.99k	}
258		/* [DIRAC_STD] Table 10.5
259		* Available signal range presets <--> pixel_range_presets */
260	27.8k	if (dsh->pixel_range_index > 0) {
261	25.5k	idx = dsh->pixel_range_index - 1;
262	25.5k	luma_depth = pixel_range_presets[idx].bitdepth;
263	25.5k	dsh->color_range = pixel_range_presets[idx].color_range;
264	25.5k	}
265
266	27.8k	dsh->bit_depth = luma_depth;
267
268		/* Full range 8 bts uses the same pix_fmts as limited range 8 bits */
269	27.8k	dsh->pixel_range_index += dsh->pixel_range_index == 1;
270
271	27.8k	if (dsh->pixel_range_index < 2U)
272	2.29k	return AVERROR_INVALIDDATA;
273
274	25.5k	dsh->pix_fmt = dirac_pix_fmt[dsh->chroma_format][dsh->pixel_range_index-2];
275	25.5k	ret = av_pix_fmt_get_chroma_sub_sample(dsh->pix_fmt, &chroma_x_shift, &chroma_y_shift);
276	25.5k	if (ret)
277	0	return ret;
278
279	25.5k	if ((dsh->width % (1<<chroma_x_shift)) \|\| (dsh->height % (1<<chroma_y_shift))) {
280	2.97k	if (log_ctx)
281	2.97k	av_log(log_ctx, AV_LOG_ERROR, "Dimensions must be an integer multiple of the chroma subsampling\n");
282	2.97k	return AVERROR_INVALIDDATA;
283	2.97k	}
284
285		/* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
286	22.5k	if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
287		/* [DIRAC_STD] index */
288	9.97k	idx = dsh->color_spec_index = get_interleaved_ue_golomb(gb);
289
290	9.97k	if (dsh->color_spec_index > 4U)
291	366	return AVERROR_INVALIDDATA;
292
293	9.60k	dsh->color_primaries = dirac_color_presets[idx].color_primaries;
294	9.60k	dsh->colorspace = dirac_color_presets[idx].colorspace;
295	9.60k	dsh->color_trc = dirac_color_presets[idx].color_trc;
296
297	9.60k	if (!dsh->color_spec_index) {
298		/* [DIRAC_STD] 10.3.9.1 Colour primaries */
299	5.15k	if (get_bits1(gb)) {
300	2.12k	idx = get_interleaved_ue_golomb(gb);
301	2.12k	if (idx < 3U)
302	1.78k	dsh->color_primaries = dirac_primaries[idx];
303	2.12k	}
304		/* [DIRAC_STD] 10.3.9.2 Colour matrix */
305	5.15k	if (get_bits1(gb)) {
306	2.96k	idx = get_interleaved_ue_golomb(gb);
307	2.96k	if (!idx)
308	2.29k	dsh->colorspace = AVCOL_SPC_BT709;
309	669	else if (idx == 1)
310	257	dsh->colorspace = AVCOL_SPC_BT470BG;
311	2.96k	}
312		/* [DIRAC_STD] 10.3.9.3 Transfer function */
313	5.15k	if (get_bits1(gb) && !get_interleaved_ue_golomb(gb))
314	1.58k	dsh->color_trc = AVCOL_TRC_BT709;
315	5.15k	}
316	12.5k	} else {
317	12.5k	idx = dsh->color_spec_index;
318	12.5k	dsh->color_primaries = dirac_color_presets[idx].color_primaries;
319	12.5k	dsh->colorspace = dirac_color_presets[idx].colorspace;
320	12.5k	dsh->color_trc = dirac_color_presets[idx].color_trc;
321	12.5k	}
322
323	22.1k	return 0;
324	22.5k	}
325
326		/* [DIRAC_STD] 10. Sequence Header. sequence_header() */
327		int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
328		const uint8_t *buf, size_t buf_size,
329		void *log_ctx)
330	34.5k	{
331	34.5k	AVDiracSeqHeader *dsh;
332	34.5k	GetBitContext gb;
333	34.5k	unsigned video_format, picture_coding_mode;
334	34.5k	int ret;
335
336	34.5k	dsh = av_mallocz(sizeof(*dsh));
337	34.5k	if (!dsh)
338	0	return AVERROR(ENOMEM);
339
340	34.5k	ret = init_get_bits8(&gb, buf, buf_size);
341	34.5k	if (ret < 0)
342	0	goto fail;
343
344		/* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
345	34.5k	dsh->version.major = get_interleaved_ue_golomb(&gb);
346	34.5k	dsh->version.minor = get_interleaved_ue_golomb(&gb);
347	34.5k	dsh->profile = get_interleaved_ue_golomb(&gb);
348	34.5k	dsh->level = get_interleaved_ue_golomb(&gb);
349		/* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in
350		* 10.2 Base Video Format, table 10.1 Dirac predefined video formats */
351	34.5k	video_format = get_interleaved_ue_golomb(&gb);
352
353	34.5k	if (dsh->version.major < 2 && log_ctx)
354	13.8k	av_log(log_ctx, AV_LOG_WARNING, "Stream is old and may not work\n");
355	20.6k	else if (dsh->version.major > 2 && log_ctx)
356	15.1k	av_log(log_ctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
357
358	34.5k	if (video_format > 20U) {
359	1.46k	ret = AVERROR_INVALIDDATA;
360	1.46k	goto fail;
361	1.46k	}
362
363		/* Fill in defaults for the source parameters. */
364	33.0k	dsh->width = dirac_source_parameters_defaults[video_format].width;
365	33.0k	dsh->height = dirac_source_parameters_defaults[video_format].height;
366	33.0k	dsh->chroma_format = dirac_source_parameters_defaults[video_format].chroma_format;
367	33.0k	dsh->interlaced = dirac_source_parameters_defaults[video_format].interlaced;
368	33.0k	dsh->top_field_first = dirac_source_parameters_defaults[video_format].top_field_first;
369	33.0k	dsh->frame_rate_index = dirac_source_parameters_defaults[video_format].frame_rate_index;
370	33.0k	dsh->aspect_ratio_index = dirac_source_parameters_defaults[video_format].aspect_ratio_index;
371	33.0k	dsh->clean_width = dirac_source_parameters_defaults[video_format].clean_width;
372	33.0k	dsh->clean_height = dirac_source_parameters_defaults[video_format].clean_height;
373	33.0k	dsh->clean_left_offset = dirac_source_parameters_defaults[video_format].clean_left_offset;
374	33.0k	dsh->clean_right_offset = dirac_source_parameters_defaults[video_format].clean_right_offset;
375	33.0k	dsh->pixel_range_index = dirac_source_parameters_defaults[video_format].pixel_range_index;
376	33.0k	dsh->color_spec_index = dirac_source_parameters_defaults[video_format].color_spec_index;
377
378		/* [DIRAC_STD] 10.3 Source Parameters
379		* Override the defaults. */
380	33.0k	ret = parse_source_parameters(dsh, &gb, log_ctx);
381	33.0k	if (ret < 0)
382	10.8k	goto fail;
383
384		/* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
385		* currently only used to signal field coding */
386	22.1k	picture_coding_mode = get_interleaved_ue_golomb(&gb);
387	22.1k	if (picture_coding_mode != 0) {
388	6.81k	if (log_ctx) {
389	6.81k	av_log(log_ctx, AV_LOG_ERROR, "Unsupported picture coding mode %d",
390	6.81k	picture_coding_mode);
391	6.81k	}
392	6.81k	ret = AVERROR_INVALIDDATA;
393	6.81k	goto fail;
394	6.81k	}
395
396	15.3k	*pdsh = dsh;
397	15.3k	return 0;
398	19.1k	fail:
399	19.1k	av_freep(&dsh);
400		*pdsh = NULL;
401	19.1k	return ret;
402	22.1k	}
403		#else
404		int av_dirac_parse_sequence_header(AVDiracSeqHeader **pdsh,
405		const uint8_t *buf, size_t buf_size,
406		void *log_ctx)
407		{
408		return AVERROR(ENOSYS);
409		}
410		#endif