/* * 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/common.h" #include "libavutil/opt.h" #include "libavcodec/bsf.h" #include "libavcodec/bsf_internal.h" #include "libavcodec/cbs.h" #include "libavcodec/cbs_bsf.h" #include "libavcodec/cbs_mpeg2.h" #include "libavcodec/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 FFBitStreamFilter ff_mpeg2_metadata_bsf = { .p.name = "mpeg2_metadata", .p.codec_ids = mpeg2_metadata_codec_ids, .p.priv_class = &mpeg2_metadata_class, .priv_data_size = sizeof(MPEG2MetadataContext), .init = &mpeg2_metadata_init, .close = &ff_cbs_bsf_generic_close, .filter = &ff_cbs_bsf_generic_filter, };