/* * Copyright (C) 2007 Marco Gerards <marco@gnu.org> * Copyright (C) 2009 David Conrad * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 parametersstatic 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 = {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 = avpriv_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 avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,                                   dirac_source_params *source){    unsigned version_major;    unsigned video_format, picture_coding_mode;     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);    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;}