LCOV - code coverage report
Current view: top level - libavcodec - mpeg2_metadata_bsf.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 67 128 52.3 %
Date: 2017-12-13 10:57:33 Functions: 4 4 100.0 %

          Line data    Source code
       1             : /*
       2             :  * This file is part of FFmpeg.
       3             :  *
       4             :  * FFmpeg is free software; you can redistribute it and/or
       5             :  * modify it under the terms of the GNU Lesser General Public
       6             :  * License as published by the Free Software Foundation; either
       7             :  * version 2.1 of the License, or (at your option) any later version.
       8             :  *
       9             :  * FFmpeg is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             :  * Lesser General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU Lesser General Public
      15             :  * License along with FFmpeg; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      17             :  */
      18             : 
      19             : #include "libavutil/avstring.h"
      20             : #include "libavutil/common.h"
      21             : #include "libavutil/opt.h"
      22             : 
      23             : #include "bsf.h"
      24             : #include "cbs.h"
      25             : #include "cbs_mpeg2.h"
      26             : #include "mpeg12.h"
      27             : 
      28             : typedef struct MPEG2MetadataContext {
      29             :     const AVClass *class;
      30             : 
      31             :     CodedBitstreamContext *cbc;
      32             :     CodedBitstreamFragment fragment;
      33             : 
      34             :     MPEG2RawExtensionData sequence_display_extension;
      35             : 
      36             :     AVRational display_aspect_ratio;
      37             : 
      38             :     AVRational frame_rate;
      39             : 
      40             :     int video_format;
      41             :     int colour_primaries;
      42             :     int transfer_characteristics;
      43             :     int matrix_coefficients;
      44             : 
      45             :     int mpeg1_warned;
      46             : } MPEG2MetadataContext;
      47             : 
      48             : 
      49          18 : static int mpeg2_metadata_update_fragment(AVBSFContext *bsf,
      50             :                                           CodedBitstreamFragment *frag)
      51             : {
      52          18 :     MPEG2MetadataContext             *ctx = bsf->priv_data;
      53          18 :     MPEG2RawSequenceHeader            *sh = NULL;
      54          18 :     MPEG2RawSequenceExtension         *se = NULL;
      55          18 :     MPEG2RawSequenceDisplayExtension *sde = NULL;
      56          18 :     int i, se_pos, add_sde = 0;
      57             : 
      58        8858 :     for (i = 0; i < frag->nb_units; i++) {
      59        8840 :         if (frag->units[i].type == MPEG2_START_SEQUENCE_HEADER) {
      60           6 :             sh = frag->units[i].content;
      61        8834 :         } else if (frag->units[i].type == MPEG2_START_EXTENSION) {
      62          53 :             MPEG2RawExtensionData *ext = frag->units[i].content;
      63          53 :             if (ext->extension_start_code_identifier ==
      64             :                 MPEG2_EXTENSION_SEQUENCE) {
      65           6 :                 se = &ext->data.sequence;
      66           6 :                 se_pos = i;
      67          47 :             } else if (ext->extension_start_code_identifier ==
      68             :                 MPEG2_EXTENSION_SEQUENCE_DISPLAY) {
      69           3 :                 sde = &ext->data.sequence_display;
      70             :             }
      71             :         }
      72             :     }
      73             : 
      74          18 :     if (!sh || !se) {
      75             :         // No sequence header and sequence extension: not an MPEG-2 video
      76             :         // sequence.
      77          12 :         if (sh && !ctx->mpeg1_warned) {
      78           0 :             av_log(bsf, AV_LOG_WARNING, "Stream contains a sequence "
      79             :                    "header but not a sequence extension: maybe it's "
      80             :                    "actually MPEG-1?\n");
      81           0 :             ctx->mpeg1_warned = 1;
      82             :         }
      83          12 :         return 0;
      84             :     }
      85             : 
      86           6 :     if (ctx->display_aspect_ratio.num && ctx->display_aspect_ratio.den) {
      87             :         int num, den;
      88             : 
      89           0 :         av_reduce(&num, &den, ctx->display_aspect_ratio.num,
      90           0 :                   ctx->display_aspect_ratio.den, 65535);
      91             : 
      92           0 :         if (num == 4 && den == 3)
      93           0 :             sh->aspect_ratio_information = 2;
      94           0 :         else if (num == 16 && den == 9)
      95           0 :             sh->aspect_ratio_information = 3;
      96           0 :         else if (num == 221 && den == 100)
      97           0 :             sh->aspect_ratio_information = 4;
      98             :         else
      99           0 :             sh->aspect_ratio_information = 1;
     100             :     }
     101             : 
     102           6 :     if (ctx->frame_rate.num && ctx->frame_rate.den) {
     103             :         int code, ext_n, ext_d;
     104             : 
     105           0 :         ff_mpeg12_find_best_frame_rate(ctx->frame_rate,
     106             :                                        &code, &ext_n, &ext_d, 0);
     107             : 
     108           0 :         sh->frame_rate_code        = code;
     109           0 :         se->frame_rate_extension_n = ext_n;
     110           0 :         se->frame_rate_extension_d = ext_d;
     111             :     }
     112             : 
     113          12 :     if (ctx->video_format             >= 0 ||
     114          12 :         ctx->colour_primaries         >= 0 ||
     115          12 :         ctx->transfer_characteristics >= 0 ||
     116           6 :         ctx->matrix_coefficients      >= 0) {
     117           0 :         if (!sde) {
     118           0 :             add_sde = 1;
     119           0 :             ctx->sequence_display_extension.extension_start_code =
     120             :                 MPEG2_START_EXTENSION;
     121           0 :             ctx->sequence_display_extension.extension_start_code_identifier =
     122             :                 MPEG2_EXTENSION_SEQUENCE_DISPLAY;
     123           0 :             sde = &ctx->sequence_display_extension.data.sequence_display;
     124             : 
     125           0 :             *sde = (MPEG2RawSequenceDisplayExtension) {
     126             :                 .video_format = 5,
     127             : 
     128             :                 .colour_description       = 0,
     129             :                 .colour_primaries         = 2,
     130             :                 .transfer_characteristics = 2,
     131             :                 .matrix_coefficients      = 2,
     132             : 
     133             :                 .display_horizontal_size =
     134           0 :                     se->horizontal_size_extension << 12 | sh->horizontal_size_value,
     135             :                 .display_vertical_size =
     136           0 :                     se->vertical_size_extension << 12 | sh->vertical_size_value,
     137             :             };
     138             :         }
     139             : 
     140           0 :         if (ctx->video_format >= 0)
     141           0 :             sde->video_format = ctx->video_format;
     142             : 
     143           0 :         if (ctx->colour_primaries         >= 0 ||
     144           0 :             ctx->transfer_characteristics >= 0 ||
     145           0 :             ctx->matrix_coefficients      >= 0) {
     146           0 :             sde->colour_description = 1;
     147             : 
     148           0 :             if (ctx->colour_primaries >= 0)
     149           0 :                 sde->colour_primaries = ctx->colour_primaries;
     150           0 :             else if (add_sde)
     151           0 :                 sde->colour_primaries = 2;
     152             : 
     153           0 :             if (ctx->transfer_characteristics >= 0)
     154           0 :                 sde->transfer_characteristics = ctx->transfer_characteristics;
     155           0 :             else if (add_sde)
     156           0 :                 sde->transfer_characteristics = 2;
     157             : 
     158           0 :             if (ctx->matrix_coefficients >= 0)
     159           0 :                 sde->matrix_coefficients = ctx->matrix_coefficients;
     160           0 :             else if (add_sde)
     161           0 :                 sde->matrix_coefficients = 2;
     162             :         }
     163             :     }
     164             : 
     165           6 :     if (add_sde) {
     166             :         int err;
     167             : 
     168           0 :         err = ff_cbs_insert_unit_content(ctx->cbc, frag, se_pos + 1,
     169             :                                          MPEG2_START_EXTENSION,
     170           0 :                                          &ctx->sequence_display_extension);
     171           0 :         if (err < 0) {
     172           0 :             av_log(bsf, AV_LOG_ERROR, "Failed to insert new sequence "
     173             :                    "display extension.\n");
     174           0 :             return err;
     175             :         }
     176             :     }
     177             : 
     178           6 :     return 0;
     179             : }
     180             : 
     181          30 : static int mpeg2_metadata_filter(AVBSFContext *bsf, AVPacket *out)
     182             : {
     183          30 :     MPEG2MetadataContext *ctx = bsf->priv_data;
     184          30 :     AVPacket *in = NULL;
     185          30 :     CodedBitstreamFragment *frag = &ctx->fragment;
     186             :     int err;
     187             : 
     188          30 :     err = ff_bsf_get_packet(bsf, &in);
     189          30 :     if (err < 0)
     190          15 :         goto fail;
     191             : 
     192          15 :     err = ff_cbs_read_packet(ctx->cbc, frag, in);
     193          15 :     if (err < 0) {
     194           0 :         av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
     195           0 :         goto fail;
     196             :     }
     197             : 
     198          15 :     err = mpeg2_metadata_update_fragment(bsf, frag);
     199          15 :     if (err < 0) {
     200           0 :         av_log(bsf, AV_LOG_ERROR, "Failed to update frame fragment.\n");
     201           0 :         goto fail;
     202             :     }
     203             : 
     204          15 :     err = ff_cbs_write_packet(ctx->cbc, out, frag);
     205          15 :     if (err < 0) {
     206           0 :         av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
     207           0 :         goto fail;
     208             :     }
     209             : 
     210          15 :     err = av_packet_copy_props(out, in);
     211          15 :     if (err < 0) {
     212           0 :         av_packet_unref(out);
     213           0 :         goto fail;
     214             :     }
     215             : 
     216          15 :     err = 0;
     217          30 : fail:
     218          30 :     ff_cbs_fragment_uninit(ctx->cbc, frag);
     219             : 
     220          30 :     av_packet_free(&in);
     221             : 
     222          30 :     return err;
     223             : }
     224             : 
     225           3 : static int mpeg2_metadata_init(AVBSFContext *bsf)
     226             : {
     227           3 :     MPEG2MetadataContext *ctx = bsf->priv_data;
     228           3 :     CodedBitstreamFragment *frag = &ctx->fragment;
     229             :     int err;
     230             : 
     231           3 :     err = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_MPEG2VIDEO, bsf);
     232           3 :     if (err < 0)
     233           0 :         return err;
     234             : 
     235           3 :     if (bsf->par_in->extradata) {
     236           3 :         err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
     237           3 :         if (err < 0) {
     238           0 :             av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
     239           0 :             goto fail;
     240             :         }
     241             : 
     242           3 :         err = mpeg2_metadata_update_fragment(bsf, frag);
     243           3 :         if (err < 0) {
     244           0 :             av_log(bsf, AV_LOG_ERROR, "Failed to update metadata fragment.\n");
     245           0 :             goto fail;
     246             :         }
     247             : 
     248           3 :         err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag);
     249           3 :         if (err < 0) {
     250           0 :             av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
     251           0 :             goto fail;
     252             :         }
     253             :     }
     254             : 
     255           3 :     err = 0;
     256           3 : fail:
     257           3 :     ff_cbs_fragment_uninit(ctx->cbc, frag);
     258           3 :     return err;
     259             : }
     260             : 
     261           3 : static void mpeg2_metadata_close(AVBSFContext *bsf)
     262             : {
     263           3 :     MPEG2MetadataContext *ctx = bsf->priv_data;
     264           3 :     ff_cbs_close(&ctx->cbc);
     265           3 : }
     266             : 
     267             : #define OFFSET(x) offsetof(MPEG2MetadataContext, x)
     268             : static const AVOption mpeg2_metadata_options[] = {
     269             :     { "display_aspect_ratio", "Set display aspect ratio (table 6-3)",
     270             :         OFFSET(display_aspect_ratio), AV_OPT_TYPE_RATIONAL,
     271             :         { .dbl = 0.0 }, 0, 65535 },
     272             : 
     273             :     { "frame_rate", "Set frame rate",
     274             :         OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL,
     275             :         { .dbl = 0.0 }, 0, UINT_MAX },
     276             : 
     277             :     { "video_format", "Set video format (table 6-6)",
     278             :         OFFSET(video_format), AV_OPT_TYPE_INT,
     279             :         { .i64 = -1 }, -1, 7 },
     280             :     { "colour_primaries", "Set colour primaries (table 6-7)",
     281             :         OFFSET(colour_primaries), AV_OPT_TYPE_INT,
     282             :         { .i64 = -1 }, -1, 255 },
     283             :     { "transfer_characteristics", "Set transfer characteristics (table 6-8)",
     284             :         OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
     285             :         { .i64 = -1 }, -1, 255 },
     286             :     { "matrix_coefficients", "Set matrix coefficients (table 6-9)",
     287             :         OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
     288             :         { .i64 = -1 }, -1, 255 },
     289             : 
     290             :     { NULL }
     291             : };
     292             : 
     293             : static const AVClass mpeg2_metadata_class = {
     294             :     .class_name = "mpeg2_metadata_bsf",
     295             :     .item_name  = av_default_item_name,
     296             :     .option     = mpeg2_metadata_options,
     297             :     .version    = LIBAVUTIL_VERSION_INT,
     298             : };
     299             : 
     300             : static const enum AVCodecID mpeg2_metadata_codec_ids[] = {
     301             :     AV_CODEC_ID_MPEG2VIDEO, AV_CODEC_ID_NONE,
     302             : };
     303             : 
     304             : const AVBitStreamFilter ff_mpeg2_metadata_bsf = {
     305             :     .name           = "mpeg2_metadata",
     306             :     .priv_data_size = sizeof(MPEG2MetadataContext),
     307             :     .priv_class     = &mpeg2_metadata_class,
     308             :     .init           = &mpeg2_metadata_init,
     309             :     .close          = &mpeg2_metadata_close,
     310             :     .filter         = &mpeg2_metadata_filter,
     311             :     .codec_ids      = mpeg2_metadata_codec_ids,
     312             : };

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