libavcodec/mpeg2_metadata_bsf.c - manifest_repos/ffmpeg - Git at Google

 /*
  * 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
  */

 #include "libavutil/avstring.h"
 #include "libavutil/common.h"
 #include "libavutil/opt.h"

 #include "bsf.h"
 #include "cbs.h"
 #include "cbs_bsf.h"
 #include "cbs_mpeg2.h"
 #include "mpeg12.h"

 typedef struct MPEG2MetadataContext {
     CBSBSFContext common;

     MPEG2RawExtensionData sequence_display_extension;

     AVRational display_aspect_ratio;

     AVRational frame_rate;

     int video_format;
     int colour_primaries;
     int transfer_characteristics;
     int matrix_coefficients;

     int mpeg1_warned;
 } MPEG2MetadataContext;


 static int mpeg2_metadata_update_fragment(AVBSFContext *bsf,
                                           AVPacket *pkt,
                                           CodedBitstreamFragment *frag)
 {
     MPEG2MetadataContext             *ctx = bsf->priv_data;
     MPEG2RawSequenceHeader            *sh = NULL;
     MPEG2RawSequenceExtension         *se = NULL;
     MPEG2RawSequenceDisplayExtension *sde = NULL;
     int i, se_pos;

     for (i = 0; i < frag->nb_units; i++) {
         if (frag->units[i].type == MPEG2_START_SEQUENCE_HEADER) {
             sh = frag->units[i].content;
         } else if (frag->units[i].type == MPEG2_START_EXTENSION) {
             MPEG2RawExtensionData *ext = frag->units[i].content;
             if (ext->extension_start_code_identifier ==
                 MPEG2_EXTENSION_SEQUENCE) {
                 se = &ext->data.sequence;
                 se_pos = i;
             } else if (ext->extension_start_code_identifier ==
                 MPEG2_EXTENSION_SEQUENCE_DISPLAY) {
                 sde = &ext->data.sequence_display;
             }
         }
     }

     if (!sh || !se) {
         // No sequence header and sequence extension: not an MPEG-2 video
         // sequence.
         if (sh && !ctx->mpeg1_warned) {
             av_log(bsf, AV_LOG_WARNING, "Stream contains a sequence "
                    "header but not a sequence extension: maybe it's "
                    "actually MPEG-1?\n");
             ctx->mpeg1_warned = 1;
         }
         return 0;
     }

     if (ctx->display_aspect_ratio.num && ctx->display_aspect_ratio.den) {
         int num, den;

         av_reduce(&num, &den, ctx->display_aspect_ratio.num,
                   ctx->display_aspect_ratio.den, 65535);

         if (num == 4 && den == 3)
             sh->aspect_ratio_information = 2;
         else if (num == 16 && den == 9)
             sh->aspect_ratio_information = 3;
         else if (num == 221 && den == 100)
             sh->aspect_ratio_information = 4;
         else
             sh->aspect_ratio_information = 1;
     }

     if (ctx->frame_rate.num && ctx->frame_rate.den) {
         int code, ext_n, ext_d;

         ff_mpeg12_find_best_frame_rate(ctx->frame_rate,
                                        &code, &ext_n, &ext_d, 0);

         sh->frame_rate_code        = code;
         se->frame_rate_extension_n = ext_n;
         se->frame_rate_extension_d = ext_d;
     }

     if (ctx->video_format             >= 0 ||
         ctx->colour_primaries         >= 0 ||
         ctx->transfer_characteristics >= 0 ||
         ctx->matrix_coefficients      >= 0) {
         if (!sde) {
             int err;
             ctx->sequence_display_extension.extension_start_code =
                 MPEG2_START_EXTENSION;
             ctx->sequence_display_extension.extension_start_code_identifier =
                 MPEG2_EXTENSION_SEQUENCE_DISPLAY;
             sde = &ctx->sequence_display_extension.data.sequence_display;

             *sde = (MPEG2RawSequenceDisplayExtension) {
                 .video_format = 5,

                 .colour_description       = 0,
                 .colour_primaries         = 2,
                 .transfer_characteristics = 2,
                 .matrix_coefficients      = 2,

                 .display_horizontal_size =
                     se->horizontal_size_extension << 12 | sh->horizontal_size_value,
                 .display_vertical_size =
                     se->vertical_size_extension << 12 | sh->vertical_size_value,
             };

             err = ff_cbs_insert_unit_content(frag, se_pos + 1,
                                              MPEG2_START_EXTENSION,
                                              &ctx->sequence_display_extension,
                                              NULL);
             if (err < 0) {
                 av_log(bsf, AV_LOG_ERROR, "Failed to insert new sequence "
                        "display extension.\n");
                 return err;
             }
         }

         if (ctx->video_format >= 0)
             sde->video_format = ctx->video_format;

         if (ctx->colour_primaries         >= 0 ||
             ctx->transfer_characteristics >= 0 ||
             ctx->matrix_coefficients      >= 0) {
             sde->colour_description = 1;

             if (ctx->colour_primaries >= 0)
                 sde->colour_primaries = ctx->colour_primaries;

             if (ctx->transfer_characteristics >= 0)
                 sde->transfer_characteristics = ctx->transfer_characteristics;

             if (ctx->matrix_coefficients >= 0)
                 sde->matrix_coefficients = ctx->matrix_coefficients;
         }
     }

     return 0;
 }

 static const CBSBSFType mpeg2_metadata_type = {
     .codec_id        = AV_CODEC_ID_MPEG2VIDEO,
     .fragment_name   = "frame",
     .unit_name       = "start code",
     .update_fragment = &mpeg2_metadata_update_fragment,
 };

 static int mpeg2_metadata_init(AVBSFContext *bsf)
 {
     MPEG2MetadataContext *ctx = bsf->priv_data;

 #define VALIDITY_CHECK(name) do { \
         if (!ctx->name) { \
             av_log(bsf, AV_LOG_ERROR, "The value 0 for %s is " \
                                       "forbidden.\n", #name); \
             return AVERROR(EINVAL); \
         } \
     } while (0)
     VALIDITY_CHECK(colour_primaries);
     VALIDITY_CHECK(transfer_characteristics);
     VALIDITY_CHECK(matrix_coefficients);
 #undef VALIDITY_CHECK

     return ff_cbs_bsf_generic_init(bsf, &mpeg2_metadata_type);
 }

 #define OFFSET(x) offsetof(MPEG2MetadataContext, x)
 #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
 static const AVOption mpeg2_metadata_options[] = {
     { "display_aspect_ratio", "Set display aspect ratio (table 6-3)",
         OFFSET(display_aspect_ratio), AV_OPT_TYPE_RATIONAL,
         { .dbl = 0.0 }, 0, 65535, FLAGS },

     { "frame_rate", "Set frame rate",
         OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL,
         { .dbl = 0.0 }, 0, UINT_MAX, FLAGS },

     { "video_format", "Set video format (table 6-6)",
         OFFSET(video_format), AV_OPT_TYPE_INT,
         { .i64 = -1 }, -1, 7, FLAGS },
     { "colour_primaries", "Set colour primaries (table 6-7)",
         OFFSET(colour_primaries), AV_OPT_TYPE_INT,
         { .i64 = -1 }, -1, 255, FLAGS },
     { "transfer_characteristics", "Set transfer characteristics (table 6-8)",
         OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
         { .i64 = -1 }, -1, 255, FLAGS },
     { "matrix_coefficients", "Set matrix coefficients (table 6-9)",
         OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
         { .i64 = -1 }, -1, 255, FLAGS },

     { NULL }
 };

 static const AVClass mpeg2_metadata_class = {
     .class_name = "mpeg2_metadata_bsf",
     .item_name  = av_default_item_name,
     .option     = mpeg2_metadata_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 static const enum AVCodecID mpeg2_metadata_codec_ids[] = {
     AV_CODEC_ID_MPEG2VIDEO, AV_CODEC_ID_NONE,
 };

 const AVBitStreamFilter ff_mpeg2_metadata_bsf = {
     .name           = "mpeg2_metadata",
     .priv_data_size = sizeof(MPEG2MetadataContext),
     .priv_class     = &mpeg2_metadata_class,
     .init           = &mpeg2_metadata_init,
     .close          = &ff_cbs_bsf_generic_close,
     .filter         = &ff_cbs_bsf_generic_filter,
     .codec_ids      = mpeg2_metadata_codec_ids,
 };
	/*
	* 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
	*/

	#include "libavutil/avstring.h"
	#include "libavutil/common.h"
	#include "libavutil/opt.h"

	#include "bsf.h"
	#include "cbs.h"
	#include "cbs_bsf.h"
	#include "cbs_mpeg2.h"
	#include "mpeg12.h"

	typedef struct MPEG2MetadataContext {
	CBSBSFContext common;

	MPEG2RawExtensionData sequence_display_extension;

	AVRational display_aspect_ratio;

	AVRational frame_rate;

	int video_format;
	int colour_primaries;
	int transfer_characteristics;
	int matrix_coefficients;

	int mpeg1_warned;
	} MPEG2MetadataContext;


	static int mpeg2_metadata_update_fragment(AVBSFContext *bsf,
	AVPacket *pkt,
	CodedBitstreamFragment *frag)
	{
	MPEG2MetadataContext *ctx = bsf->priv_data;
	MPEG2RawSequenceHeader *sh = NULL;
	MPEG2RawSequenceExtension *se = NULL;
	MPEG2RawSequenceDisplayExtension *sde = NULL;
	int i, se_pos;

	for (i = 0; i < frag->nb_units; i++) {
	if (frag->units[i].type == MPEG2_START_SEQUENCE_HEADER) {
	sh = frag->units[i].content;
	} else if (frag->units[i].type == MPEG2_START_EXTENSION) {
	MPEG2RawExtensionData *ext = frag->units[i].content;
	if (ext->extension_start_code_identifier ==
	MPEG2_EXTENSION_SEQUENCE) {
	se = &ext->data.sequence;
	se_pos = i;
	} else if (ext->extension_start_code_identifier ==
	MPEG2_EXTENSION_SEQUENCE_DISPLAY) {
	sde = &ext->data.sequence_display;
	}
	}
	}

	if (!sh \|\| !se) {
	// No sequence header and sequence extension: not an MPEG-2 video
	// sequence.
	if (sh && !ctx->mpeg1_warned) {
	av_log(bsf, AV_LOG_WARNING, "Stream contains a sequence "
	"header but not a sequence extension: maybe it's "
	"actually MPEG-1?\n");
	ctx->mpeg1_warned = 1;
	}
	return 0;
	}

	if (ctx->display_aspect_ratio.num && ctx->display_aspect_ratio.den) {
	int num, den;

	av_reduce(&num, &den, ctx->display_aspect_ratio.num,
	ctx->display_aspect_ratio.den, 65535);

	if (num == 4 && den == 3)
	sh->aspect_ratio_information = 2;
	else if (num == 16 && den == 9)
	sh->aspect_ratio_information = 3;
	else if (num == 221 && den == 100)
	sh->aspect_ratio_information = 4;
	else
	sh->aspect_ratio_information = 1;
	}

	if (ctx->frame_rate.num && ctx->frame_rate.den) {
	int code, ext_n, ext_d;

	ff_mpeg12_find_best_frame_rate(ctx->frame_rate,
	&code, &ext_n, &ext_d, 0);

	sh->frame_rate_code = code;
	se->frame_rate_extension_n = ext_n;
	se->frame_rate_extension_d = ext_d;
	}

	if (ctx->video_format >= 0 \|\|
	ctx->colour_primaries >= 0 \|\|
	ctx->transfer_characteristics >= 0 \|\|
	ctx->matrix_coefficients >= 0) {
	if (!sde) {
	int err;
	ctx->sequence_display_extension.extension_start_code =
	MPEG2_START_EXTENSION;
	ctx->sequence_display_extension.extension_start_code_identifier =
	MPEG2_EXTENSION_SEQUENCE_DISPLAY;
	sde = &ctx->sequence_display_extension.data.sequence_display;

	*sde = (MPEG2RawSequenceDisplayExtension) {
	.video_format = 5,

	.colour_description = 0,
	.colour_primaries = 2,
	.transfer_characteristics = 2,
	.matrix_coefficients = 2,

	.display_horizontal_size =
	se->horizontal_size_extension << 12 \| sh->horizontal_size_value,
	.display_vertical_size =
	se->vertical_size_extension << 12 \| sh->vertical_size_value,
	};

	err = ff_cbs_insert_unit_content(frag, se_pos + 1,
	MPEG2_START_EXTENSION,
	&ctx->sequence_display_extension,
	NULL);
	if (err < 0) {
	av_log(bsf, AV_LOG_ERROR, "Failed to insert new sequence "
	"display extension.\n");
	return err;
	}
	}

	if (ctx->video_format >= 0)
	sde->video_format = ctx->video_format;

	if (ctx->colour_primaries >= 0 \|\|
	ctx->transfer_characteristics >= 0 \|\|
	ctx->matrix_coefficients >= 0) {
	sde->colour_description = 1;

	if (ctx->colour_primaries >= 0)
	sde->colour_primaries = ctx->colour_primaries;

	if (ctx->transfer_characteristics >= 0)
	sde->transfer_characteristics = ctx->transfer_characteristics;

	if (ctx->matrix_coefficients >= 0)
	sde->matrix_coefficients = ctx->matrix_coefficients;
	}
	}

	return 0;
	}

	static const CBSBSFType mpeg2_metadata_type = {
	.codec_id = AV_CODEC_ID_MPEG2VIDEO,
	.fragment_name = "frame",
	.unit_name = "start code",
	.update_fragment = &mpeg2_metadata_update_fragment,
	};

	static int mpeg2_metadata_init(AVBSFContext *bsf)
	{
	MPEG2MetadataContext *ctx = bsf->priv_data;

	#define VALIDITY_CHECK(name) do { \
	if (!ctx->name) { \
	av_log(bsf, AV_LOG_ERROR, "The value 0 for %s is " \
	"forbidden.\n", #name); \
	return AVERROR(EINVAL); \
	} \
	} while (0)
	VALIDITY_CHECK(colour_primaries);
	VALIDITY_CHECK(transfer_characteristics);
	VALIDITY_CHECK(matrix_coefficients);
	#undef VALIDITY_CHECK

	return ff_cbs_bsf_generic_init(bsf, &mpeg2_metadata_type);
	}

	#define OFFSET(x) offsetof(MPEG2MetadataContext, x)
	#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM\|AV_OPT_FLAG_BSF_PARAM)
	static const AVOption mpeg2_metadata_options[] = {
	{ "display_aspect_ratio", "Set display aspect ratio (table 6-3)",
	OFFSET(display_aspect_ratio), AV_OPT_TYPE_RATIONAL,
	{ .dbl = 0.0 }, 0, 65535, FLAGS },

	{ "frame_rate", "Set frame rate",
	OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL,
	{ .dbl = 0.0 }, 0, UINT_MAX, FLAGS },

	{ "video_format", "Set video format (table 6-6)",
	OFFSET(video_format), AV_OPT_TYPE_INT,
	{ .i64 = -1 }, -1, 7, FLAGS },
	{ "colour_primaries", "Set colour primaries (table 6-7)",
	OFFSET(colour_primaries), AV_OPT_TYPE_INT,
	{ .i64 = -1 }, -1, 255, FLAGS },
	{ "transfer_characteristics", "Set transfer characteristics (table 6-8)",
	OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
	{ .i64 = -1 }, -1, 255, FLAGS },
	{ "matrix_coefficients", "Set matrix coefficients (table 6-9)",
	OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
	{ .i64 = -1 }, -1, 255, FLAGS },

	{ NULL }
	};

	static const AVClass mpeg2_metadata_class = {
	.class_name = "mpeg2_metadata_bsf",
	.item_name = av_default_item_name,
	.option = mpeg2_metadata_options,
	.version = LIBAVUTIL_VERSION_INT,
	};

	static const enum AVCodecID mpeg2_metadata_codec_ids[] = {
	AV_CODEC_ID_MPEG2VIDEO, AV_CODEC_ID_NONE,
	};

	const AVBitStreamFilter ff_mpeg2_metadata_bsf = {
	.name = "mpeg2_metadata",
	.priv_data_size = sizeof(MPEG2MetadataContext),
	.priv_class = &mpeg2_metadata_class,
	.init = &mpeg2_metadata_init,
	.close = &ff_cbs_bsf_generic_close,
	.filter = &ff_cbs_bsf_generic_filter,
	.codec_ids = mpeg2_metadata_codec_ids,
	};