314 lines
9.9 KiB
C
314 lines
9.9 KiB
C
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "bsf.h"
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#include "bsf_internal.h"
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#include "cbs.h"
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#include "cbs_mpeg2.h"
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#include "mpeg12.h"
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typedef struct MPEG2MetadataContext {
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const AVClass *class;
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CodedBitstreamContext *cbc;
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CodedBitstreamFragment fragment;
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MPEG2RawExtensionData sequence_display_extension;
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AVRational display_aspect_ratio;
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AVRational frame_rate;
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int video_format;
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int colour_primaries;
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int transfer_characteristics;
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int matrix_coefficients;
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int mpeg1_warned;
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} MPEG2MetadataContext;
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static int mpeg2_metadata_update_fragment(AVBSFContext *bsf,
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CodedBitstreamFragment *frag)
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{
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MPEG2MetadataContext *ctx = bsf->priv_data;
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MPEG2RawSequenceHeader *sh = NULL;
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MPEG2RawSequenceExtension *se = NULL;
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MPEG2RawSequenceDisplayExtension *sde = NULL;
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int i, se_pos;
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for (i = 0; i < frag->nb_units; i++) {
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if (frag->units[i].type == MPEG2_START_SEQUENCE_HEADER) {
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sh = frag->units[i].content;
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} else if (frag->units[i].type == MPEG2_START_EXTENSION) {
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MPEG2RawExtensionData *ext = frag->units[i].content;
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if (ext->extension_start_code_identifier ==
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MPEG2_EXTENSION_SEQUENCE) {
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se = &ext->data.sequence;
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se_pos = i;
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} else if (ext->extension_start_code_identifier ==
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MPEG2_EXTENSION_SEQUENCE_DISPLAY) {
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sde = &ext->data.sequence_display;
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}
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}
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}
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if (!sh || !se) {
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// No sequence header and sequence extension: not an MPEG-2 video
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// sequence.
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if (sh && !ctx->mpeg1_warned) {
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av_log(bsf, AV_LOG_WARNING, "Stream contains a sequence "
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"header but not a sequence extension: maybe it's "
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"actually MPEG-1?\n");
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ctx->mpeg1_warned = 1;
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}
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return 0;
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}
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if (ctx->display_aspect_ratio.num && ctx->display_aspect_ratio.den) {
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int num, den;
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av_reduce(&num, &den, ctx->display_aspect_ratio.num,
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ctx->display_aspect_ratio.den, 65535);
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if (num == 4 && den == 3)
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sh->aspect_ratio_information = 2;
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else if (num == 16 && den == 9)
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sh->aspect_ratio_information = 3;
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else if (num == 221 && den == 100)
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sh->aspect_ratio_information = 4;
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else
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sh->aspect_ratio_information = 1;
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}
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if (ctx->frame_rate.num && ctx->frame_rate.den) {
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int code, ext_n, ext_d;
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ff_mpeg12_find_best_frame_rate(ctx->frame_rate,
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&code, &ext_n, &ext_d, 0);
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sh->frame_rate_code = code;
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se->frame_rate_extension_n = ext_n;
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se->frame_rate_extension_d = ext_d;
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}
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if (ctx->video_format >= 0 ||
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ctx->colour_primaries >= 0 ||
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ctx->transfer_characteristics >= 0 ||
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ctx->matrix_coefficients >= 0) {
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if (!sde) {
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int err;
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ctx->sequence_display_extension.extension_start_code =
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MPEG2_START_EXTENSION;
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ctx->sequence_display_extension.extension_start_code_identifier =
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MPEG2_EXTENSION_SEQUENCE_DISPLAY;
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sde = &ctx->sequence_display_extension.data.sequence_display;
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*sde = (MPEG2RawSequenceDisplayExtension) {
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.video_format = 5,
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.colour_description = 0,
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.colour_primaries = 2,
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.transfer_characteristics = 2,
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.matrix_coefficients = 2,
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.display_horizontal_size =
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se->horizontal_size_extension << 12 | sh->horizontal_size_value,
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.display_vertical_size =
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se->vertical_size_extension << 12 | sh->vertical_size_value,
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};
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err = ff_cbs_insert_unit_content(ctx->cbc, frag, se_pos + 1,
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MPEG2_START_EXTENSION,
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&ctx->sequence_display_extension,
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NULL);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to insert new sequence "
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"display extension.\n");
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return err;
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}
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}
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if (ctx->video_format >= 0)
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sde->video_format = ctx->video_format;
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if (ctx->colour_primaries >= 0 ||
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ctx->transfer_characteristics >= 0 ||
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ctx->matrix_coefficients >= 0) {
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sde->colour_description = 1;
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if (ctx->colour_primaries >= 0)
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sde->colour_primaries = ctx->colour_primaries;
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if (ctx->transfer_characteristics >= 0)
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sde->transfer_characteristics = ctx->transfer_characteristics;
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if (ctx->matrix_coefficients >= 0)
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sde->matrix_coefficients = ctx->matrix_coefficients;
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}
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}
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return 0;
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}
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static int mpeg2_metadata_filter(AVBSFContext *bsf, AVPacket *pkt)
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{
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MPEG2MetadataContext *ctx = bsf->priv_data;
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CodedBitstreamFragment *frag = &ctx->fragment;
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int err;
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err = ff_bsf_get_packet_ref(bsf, pkt);
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if (err < 0)
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return err;
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err = ff_cbs_read_packet(ctx->cbc, frag, pkt);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
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goto fail;
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}
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err = mpeg2_metadata_update_fragment(bsf, frag);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to update frame fragment.\n");
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goto fail;
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}
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err = ff_cbs_write_packet(ctx->cbc, pkt, frag);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
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goto fail;
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}
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err = 0;
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fail:
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ff_cbs_fragment_reset(ctx->cbc, frag);
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if (err < 0)
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av_packet_unref(pkt);
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return err;
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}
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static int mpeg2_metadata_init(AVBSFContext *bsf)
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{
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MPEG2MetadataContext *ctx = bsf->priv_data;
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CodedBitstreamFragment *frag = &ctx->fragment;
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int err;
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#define VALIDITY_CHECK(name) do { \
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if (!ctx->name) { \
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av_log(bsf, AV_LOG_ERROR, "The value 0 for %s is " \
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"forbidden.\n", #name); \
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return AVERROR(EINVAL); \
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} \
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} while (0)
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VALIDITY_CHECK(colour_primaries);
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VALIDITY_CHECK(transfer_characteristics);
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VALIDITY_CHECK(matrix_coefficients);
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#undef VALIDITY_CHECK
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err = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_MPEG2VIDEO, bsf);
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if (err < 0)
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return err;
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if (bsf->par_in->extradata) {
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err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
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goto fail;
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}
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err = mpeg2_metadata_update_fragment(bsf, frag);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to update metadata fragment.\n");
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goto fail;
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}
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err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
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goto fail;
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}
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}
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err = 0;
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fail:
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ff_cbs_fragment_reset(ctx->cbc, frag);
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return err;
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}
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static void mpeg2_metadata_close(AVBSFContext *bsf)
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{
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MPEG2MetadataContext *ctx = bsf->priv_data;
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ff_cbs_fragment_free(ctx->cbc, &ctx->fragment);
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ff_cbs_close(&ctx->cbc);
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}
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#define OFFSET(x) offsetof(MPEG2MetadataContext, x)
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#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
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static const AVOption mpeg2_metadata_options[] = {
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{ "display_aspect_ratio", "Set display aspect ratio (table 6-3)",
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OFFSET(display_aspect_ratio), AV_OPT_TYPE_RATIONAL,
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{ .dbl = 0.0 }, 0, 65535, FLAGS },
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{ "frame_rate", "Set frame rate",
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OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL,
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{ .dbl = 0.0 }, 0, UINT_MAX, FLAGS },
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{ "video_format", "Set video format (table 6-6)",
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OFFSET(video_format), AV_OPT_TYPE_INT,
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{ .i64 = -1 }, -1, 7, FLAGS },
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{ "colour_primaries", "Set colour primaries (table 6-7)",
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OFFSET(colour_primaries), AV_OPT_TYPE_INT,
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{ .i64 = -1 }, -1, 255, FLAGS },
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{ "transfer_characteristics", "Set transfer characteristics (table 6-8)",
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OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
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{ .i64 = -1 }, -1, 255, FLAGS },
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{ "matrix_coefficients", "Set matrix coefficients (table 6-9)",
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OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
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{ .i64 = -1 }, -1, 255, FLAGS },
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{ NULL }
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};
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static const AVClass mpeg2_metadata_class = {
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.class_name = "mpeg2_metadata_bsf",
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.item_name = av_default_item_name,
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.option = mpeg2_metadata_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const enum AVCodecID mpeg2_metadata_codec_ids[] = {
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AV_CODEC_ID_MPEG2VIDEO, AV_CODEC_ID_NONE,
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};
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const AVBitStreamFilter ff_mpeg2_metadata_bsf = {
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.name = "mpeg2_metadata",
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.priv_data_size = sizeof(MPEG2MetadataContext),
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.priv_class = &mpeg2_metadata_class,
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.init = &mpeg2_metadata_init,
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.close = &mpeg2_metadata_close,
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.filter = &mpeg2_metadata_filter,
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.codec_ids = mpeg2_metadata_codec_ids,
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};
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