FFmpeg: libavcodec/dirac.c Source File

00001 /*
00002  * Copyright (C) 2007 Marco Gerards <marco@gnu.org>
00003  * Copyright (C) 2009 David Conrad
00004  * Copyright (C) 2011 Jordi Ortiz
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00029 #include "libavutil/imgutils.h"
00030 #include "dirac.h"
00031 #include "avcodec.h"
00032 #include "golomb.h"
00033 #include "mpeg12data.h"
00034 
00035 /* defaults for source parameters */
00036 static const dirac_source_params dirac_source_parameters_defaults[] = {
00037     { 640,  480,  2, 0, 0, 1,  1, 640,  480,  0, 0, 1, 0 },
00038     { 176,  120,  2, 0, 0, 9,  2, 176,  120,  0, 0, 1, 1 },
00039     { 176,  144,  2, 0, 1, 10, 3, 176,  144,  0, 0, 1, 2 },
00040     { 352,  240,  2, 0, 0, 9,  2, 352,  240,  0, 0, 1, 1 },
00041     { 352,  288,  2, 0, 1, 10, 3, 352,  288,  0, 0, 1, 2 },
00042     { 704,  480,  2, 0, 0, 9,  2, 704,  480,  0, 0, 1, 1 },
00043     { 704,  576,  2, 0, 1, 10, 3, 704,  576,  0, 0, 1, 2 },
00044     { 720,  480,  1, 1, 0, 4,  2, 704,  480,  8, 0, 3, 1 },
00045     { 720,  576,  1, 1, 1, 3,  3, 704,  576,  8, 0, 3, 2 },
00046     { 1280, 720,  1, 0, 1, 7,  1, 1280, 720,  0, 0, 3, 3 },
00047     { 1280, 720,  1, 0, 1, 6,  1, 1280, 720,  0, 0, 3, 3 },
00048     { 1920, 1080, 1, 1, 1, 4,  1, 1920, 1080, 0, 0, 3, 3 },
00049     { 1920, 1080, 1, 1, 1, 3,  1, 1920, 1080, 0, 0, 3, 3 },
00050     { 1920, 1080, 1, 0, 1, 7,  1, 1920, 1080, 0, 0, 3, 3 },
00051     { 1920, 1080, 1, 0, 1, 6,  1, 1920, 1080, 0, 0, 3, 3 },
00052     { 2048, 1080, 0, 0, 1, 2,  1, 2048, 1080, 0, 0, 4, 4 },
00053     { 4096, 2160, 0, 0, 1, 2,  1, 4096, 2160, 0, 0, 4, 4 },
00054     { 3840, 2160, 1, 0, 1, 7,  1, 3840, 2160, 0, 0, 3, 3 },
00055     { 3840, 2160, 1, 0, 1, 6,  1, 3840, 2160, 0, 0, 3, 3 },
00056     { 7680, 4320, 1, 0, 1, 7,  1, 3840, 2160, 0, 0, 3, 3 },
00057     { 7680, 4320, 1, 0, 1, 6,  1, 3840, 2160, 0, 0, 3, 3 },
00058 };
00059 
00060 /* [DIRAC_STD] Table 10.4 - Available preset pixel aspect ratio values */
00061 static const AVRational dirac_preset_aspect_ratios[] = {
00062     {1, 1},
00063     {10, 11},
00064     {12, 11},
00065     {40, 33},
00066     {16, 11},
00067     {4, 3},
00068 };
00069 
00070 /* [DIRAC_STD] Values 9,10 of 10.3.5 Frame Rate.
00071  * Table 10.3 Available preset frame rate values
00072  */
00073 static const AVRational dirac_frame_rate[] = {
00074     {15000, 1001},
00075     {25, 2},
00076 };
00077 
00078 /* [DIRAC_STD] This should be equivalent to Table 10.5 Available signal
00079  * range presets */
00080 static const struct {
00081     uint8_t             bitdepth;
00082     enum AVColorRange   color_range;
00083 } pixel_range_presets[] = {
00084     {8,  AVCOL_RANGE_JPEG},
00085     {8,  AVCOL_RANGE_MPEG},
00086     {10, AVCOL_RANGE_MPEG},
00087     {12, AVCOL_RANGE_MPEG},
00088 };
00089 
00090 static const enum AVColorPrimaries dirac_primaries[] = {
00091     AVCOL_PRI_BT709,
00092     AVCOL_PRI_SMPTE170M,
00093     AVCOL_PRI_BT470BG,
00094 };
00095 
00096 static const struct {
00097     enum AVColorPrimaries color_primaries;
00098     enum AVColorSpace colorspace;
00099     enum AVColorTransferCharacteristic color_trc;
00100 } dirac_color_presets[] = {
00101     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
00102     { AVCOL_PRI_SMPTE170M, AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
00103     { AVCOL_PRI_BT470BG,   AVCOL_SPC_BT470BG, AVCOL_TRC_BT709 },
00104     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_BT709 },
00105     { AVCOL_PRI_BT709,     AVCOL_SPC_BT709,   AVCOL_TRC_UNSPECIFIED /* DCinema */ },
00106 };
00107 
00108 /* [DIRAC_STD] Table 10.2 Supported chroma sampling formats + luma Offset */
00109 static const enum AVPixelFormat dirac_pix_fmt[2][3] = {
00110     { AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P  },
00111     { AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P },
00112 };
00113 
00114 /* [DIRAC_STD] 10.3 Parse Source Parameters.
00115  * source_parameters(base_video_format) */
00116 static int parse_source_parameters(AVCodecContext *avctx, GetBitContext *gb,
00117                                    dirac_source_params *source)
00118 {
00119     AVRational frame_rate = {0,0};
00120     unsigned luma_depth = 8, luma_offset = 16;
00121     int idx;
00122     int chroma_x_shift, chroma_y_shift;
00123 
00124     /* [DIRAC_STD] 10.3.2 Frame size. frame_size(video_params) */
00125     /* [DIRAC_STD] custom_dimensions_flag */
00126     if (get_bits1(gb)) {
00127         source->width  = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_WIDTH  */
00128         source->height = svq3_get_ue_golomb(gb); /* [DIRAC_STD] FRAME_HEIGHT */
00129     }
00130 
00131     /* [DIRAC_STD] 10.3.3 Chroma Sampling Format.
00132      *  chroma_sampling_format(video_params) */
00133     /* [DIRAC_STD] custom_chroma_format_flag */
00134     if (get_bits1(gb))
00135         /* [DIRAC_STD] CHROMA_FORMAT_INDEX */
00136         source->chroma_format = svq3_get_ue_golomb(gb);
00137     if (source->chroma_format > 2U) {
00138         av_log(avctx, AV_LOG_ERROR, "Unknown chroma format %d\n",
00139                source->chroma_format);
00140         return AVERROR_INVALIDDATA;
00141     }
00142 
00143     /* [DIRAC_STD] 10.3.4 Scan Format. scan_format(video_params) */
00144     /* [DIRAC_STD] custom_scan_format_flag */
00145     if (get_bits1(gb))
00146         /* [DIRAC_STD] SOURCE_SAMPLING */
00147         source->interlaced = svq3_get_ue_golomb(gb);
00148     if (source->interlaced > 1U)
00149         return AVERROR_INVALIDDATA;
00150 
00151     /* [DIRAC_STD] 10.3.5 Frame Rate. frame_rate(video_params) */
00152     if (get_bits1(gb)) { /* [DIRAC_STD] custom_frame_rate_flag */
00153         source->frame_rate_index = svq3_get_ue_golomb(gb);
00154 
00155         if (source->frame_rate_index > 10U)
00156             return AVERROR_INVALIDDATA;
00157 
00158         if (!source->frame_rate_index) {
00159             /* [DIRAC_STD] FRAME_RATE_NUMER */
00160             frame_rate.num = svq3_get_ue_golomb(gb);
00161             /* [DIRAC_STD] FRAME_RATE_DENOM */
00162             frame_rate.den = svq3_get_ue_golomb(gb);
00163         }
00164     }
00165     /* [DIRAC_STD] preset_frame_rate(video_params, index) */
00166     if (source->frame_rate_index > 0) {
00167         if (source->frame_rate_index <= 8)
00168             frame_rate = ff_mpeg12_frame_rate_tab[source->frame_rate_index];
00169         else
00170              /* [DIRAC_STD] Table 10.3 values 9-10 */
00171             frame_rate = dirac_frame_rate[source->frame_rate_index-9];
00172     }
00173     av_reduce(&avctx->time_base.num, &avctx->time_base.den,
00174               frame_rate.den, frame_rate.num, 1<<30);
00175 
00176     /* [DIRAC_STD] 10.3.6 Pixel Aspect Ratio.
00177      * pixel_aspect_ratio(video_params) */
00178     if (get_bits1(gb)) { /* [DIRAC_STD] custom_pixel_aspect_ratio_flag */
00179          /* [DIRAC_STD] index */
00180         source->aspect_ratio_index = svq3_get_ue_golomb(gb);
00181 
00182         if (source->aspect_ratio_index > 6U)
00183             return AVERROR_INVALIDDATA;
00184 
00185         if (!source->aspect_ratio_index) {
00186             avctx->sample_aspect_ratio.num = svq3_get_ue_golomb(gb);
00187             avctx->sample_aspect_ratio.den = svq3_get_ue_golomb(gb);
00188         }
00189     }
00190     /* [DIRAC_STD] Take value from Table 10.4 Available preset pixel
00191      *  aspect ratio values */
00192     if (source->aspect_ratio_index > 0)
00193         avctx->sample_aspect_ratio =
00194             dirac_preset_aspect_ratios[source->aspect_ratio_index-1];
00195 
00196     /* [DIRAC_STD] 10.3.7 Clean area. clean_area(video_params) */
00197     if (get_bits1(gb)) { /* [DIRAC_STD] custom_clean_area_flag */
00198         /* [DIRAC_STD] CLEAN_WIDTH */
00199         source->clean_width        = svq3_get_ue_golomb(gb);
00200          /* [DIRAC_STD] CLEAN_HEIGHT */
00201         source->clean_height       = svq3_get_ue_golomb(gb);
00202          /* [DIRAC_STD] CLEAN_LEFT_OFFSET */
00203         source->clean_left_offset  = svq3_get_ue_golomb(gb);
00204         /* [DIRAC_STD] CLEAN_RIGHT_OFFSET */
00205         source->clean_right_offset = svq3_get_ue_golomb(gb);
00206     }
00207 
00208     /* [DIRAC_STD] 10.3.8 Signal range. signal_range(video_params)
00209      * WARNING: Some adaptation seems to be done using the
00210      * AVCOL_RANGE_MPEG/JPEG values */
00211     if (get_bits1(gb)) { /* [DIRAC_STD] custom_signal_range_flag */
00212         /* [DIRAC_STD] index */
00213         source->pixel_range_index = svq3_get_ue_golomb(gb);
00214 
00215         if (source->pixel_range_index > 4U)
00216             return AVERROR_INVALIDDATA;
00217 
00218         /* This assumes either fullrange or MPEG levels only */
00219         if (!source->pixel_range_index) {
00220             luma_offset = svq3_get_ue_golomb(gb);
00221             luma_depth  = av_log2(svq3_get_ue_golomb(gb))+1;
00222             svq3_get_ue_golomb(gb); /* chroma offset    */
00223             svq3_get_ue_golomb(gb); /* chroma excursion */
00224             avctx->color_range = luma_offset ? AVCOL_RANGE_MPEG : AVCOL_RANGE_JPEG;
00225         }
00226     }
00227     /* [DIRAC_STD] Table 10.5
00228      * Available signal range presets <--> pixel_range_presets */
00229     if (source->pixel_range_index > 0) {
00230         idx                = source->pixel_range_index-1;
00231         luma_depth         = pixel_range_presets[idx].bitdepth;
00232         avctx->color_range = pixel_range_presets[idx].color_range;
00233     }
00234 
00235     if (luma_depth > 8)
00236         av_log(avctx, AV_LOG_WARNING, "Bitdepth greater than 8\n");
00237 
00238     avctx->pix_fmt = dirac_pix_fmt[!luma_offset][source->chroma_format];
00239     avcodec_get_chroma_sub_sample(avctx->pix_fmt, &chroma_x_shift, &chroma_y_shift);
00240     if (!(source->width % (1<<chroma_x_shift)) || !(source->height % (1<<chroma_y_shift))) {
00241         av_log(avctx, AV_LOG_ERROR, "Dimensions must be a integer multiply of the chroma subsampling\n");
00242         return AVERROR_INVALIDDATA;
00243     }
00244 
00245 
00246     /* [DIRAC_STD] 10.3.9 Colour specification. colour_spec(video_params) */
00247     if (get_bits1(gb)) { /* [DIRAC_STD] custom_colour_spec_flag */
00248          /* [DIRAC_STD] index */
00249         idx = source->color_spec_index = svq3_get_ue_golomb(gb);
00250 
00251         if (source->color_spec_index > 4U)
00252             return AVERROR_INVALIDDATA;
00253 
00254         avctx->color_primaries = dirac_color_presets[idx].color_primaries;
00255         avctx->colorspace      = dirac_color_presets[idx].colorspace;
00256         avctx->color_trc       = dirac_color_presets[idx].color_trc;
00257 
00258         if (!source->color_spec_index) {
00259             /* [DIRAC_STD] 10.3.9.1 Colour primaries */
00260             if (get_bits1(gb)) {
00261                 idx = svq3_get_ue_golomb(gb);
00262                 if (idx < 3U)
00263                     avctx->color_primaries = dirac_primaries[idx];
00264             }
00265             /* [DIRAC_STD] 10.3.9.2 Colour matrix */
00266             if (get_bits1(gb)) {
00267                 idx = svq3_get_ue_golomb(gb);
00268                 if (!idx)
00269                     avctx->colorspace = AVCOL_SPC_BT709;
00270                 else if (idx == 1)
00271                     avctx->colorspace = AVCOL_SPC_BT470BG;
00272             }
00273             /* [DIRAC_STD] 10.3.9.3 Transfer function */
00274             if (get_bits1(gb) && !svq3_get_ue_golomb(gb))
00275                 avctx->color_trc = AVCOL_TRC_BT709;
00276         }
00277     } else {
00278         idx = source->color_spec_index;
00279         avctx->color_primaries = dirac_color_presets[idx].color_primaries;
00280         avctx->colorspace      = dirac_color_presets[idx].colorspace;
00281         avctx->color_trc       = dirac_color_presets[idx].color_trc;
00282     }
00283 
00284     return 0;
00285 }
00286 
00287 /* [DIRAC_STD] 10. Sequence Header. sequence_header() */
00288 int avpriv_dirac_parse_sequence_header(AVCodecContext *avctx, GetBitContext *gb,
00289                                    dirac_source_params *source)
00290 {
00291     unsigned version_major;
00292     unsigned video_format, picture_coding_mode;
00293     int ret;
00294 
00295     /* [DIRAC_SPEC] 10.1 Parse Parameters. parse_parameters() */
00296     version_major  = svq3_get_ue_golomb(gb);
00297     svq3_get_ue_golomb(gb); /* version_minor */
00298     avctx->profile = svq3_get_ue_golomb(gb);
00299     avctx->level   = svq3_get_ue_golomb(gb);
00300     /* [DIRAC_SPEC] sequence_header() -> base_video_format as defined in
00301      * 10.2 Base Video Format, table 10.1 Dirac predefined video formats */
00302     video_format   = svq3_get_ue_golomb(gb);
00303 
00304     if (version_major < 2)
00305         av_log(avctx, AV_LOG_WARNING, "Stream is old and may not work\n");
00306     else if (version_major > 2)
00307         av_log(avctx, AV_LOG_WARNING, "Stream may have unhandled features\n");
00308 
00309     if (video_format > 20U)
00310         return AVERROR_INVALIDDATA;
00311 
00312     /* Fill in defaults for the source parameters. */
00313     *source = dirac_source_parameters_defaults[video_format];
00314 
00315     /* [DIRAC_STD] 10.3 Source Parameters
00316      * Override the defaults. */
00317     if (ret = parse_source_parameters(avctx, gb, source))
00318         return ret;
00319 
00320     if (ret = av_image_check_size(source->width, source->height, 0, avctx))
00321         return ret;
00322 
00323     avcodec_set_dimensions(avctx, source->width, source->height);
00324 
00325     /* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
00326      * currently only used to signal field coding */
00327     picture_coding_mode = svq3_get_ue_golomb(gb);
00328     if (picture_coding_mode != 0) {
00329         av_log(avctx, AV_LOG_ERROR, "Unsupported picture coding mode %d\n",
00330                picture_coding_mode);
00331         return AVERROR_INVALIDDATA;
00332     }
00333     return 0;
00334 }