| 569721ac |
/*
* 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_mpeg2.h"
#include "mpeg12.h"
typedef struct MPEG2MetadataContext {
const AVClass *class;
CodedBitstreamContext *cbc;
CodedBitstreamFragment fragment;
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,
CodedBitstreamFragment *frag)
{
MPEG2MetadataContext *ctx = bsf->priv_data;
MPEG2RawSequenceHeader *sh = NULL;
MPEG2RawSequenceExtension *se = NULL;
MPEG2RawSequenceDisplayExtension *sde = NULL;
int i, se_pos, add_sde = 0;
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) {
add_sde = 1;
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,
};
}
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;
else if (add_sde)
sde->colour_primaries = 2;
if (ctx->transfer_characteristics >= 0)
sde->transfer_characteristics = ctx->transfer_characteristics;
else if (add_sde)
sde->transfer_characteristics = 2;
if (ctx->matrix_coefficients >= 0)
sde->matrix_coefficients = ctx->matrix_coefficients;
else if (add_sde)
sde->matrix_coefficients = 2;
}
}
if (add_sde) {
int err;
err = ff_cbs_insert_unit_content(ctx->cbc, frag, se_pos + 1,
MPEG2_START_EXTENSION,
&ctx->sequence_display_extension);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to insert new sequence "
"display extension.\n");
return err;
}
}
return 0;
}
static int mpeg2_metadata_filter(AVBSFContext *bsf, AVPacket *out)
{
MPEG2MetadataContext *ctx = bsf->priv_data;
AVPacket *in = NULL;
CodedBitstreamFragment *frag = &ctx->fragment;
int err;
err = ff_bsf_get_packet(bsf, &in);
if (err < 0)
goto fail;
err = ff_cbs_read_packet(ctx->cbc, frag, in);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to read packet.\n");
goto fail;
}
err = mpeg2_metadata_update_fragment(bsf, frag);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to update frame fragment.\n");
goto fail;
}
err = ff_cbs_write_packet(ctx->cbc, out, frag);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to write packet.\n");
goto fail;
}
err = av_packet_copy_props(out, in);
if (err < 0) {
av_packet_unref(out);
goto fail;
}
err = 0;
fail:
ff_cbs_fragment_uninit(ctx->cbc, frag);
av_packet_free(&in);
return err;
}
static int mpeg2_metadata_init(AVBSFContext *bsf)
{
MPEG2MetadataContext *ctx = bsf->priv_data;
CodedBitstreamFragment *frag = &ctx->fragment;
int err;
err = ff_cbs_init(&ctx->cbc, AV_CODEC_ID_MPEG2VIDEO, bsf);
if (err < 0)
return err;
if (bsf->par_in->extradata) {
err = ff_cbs_read_extradata(ctx->cbc, frag, bsf->par_in);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
goto fail;
}
err = mpeg2_metadata_update_fragment(bsf, frag);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to update metadata fragment.\n");
goto fail;
}
err = ff_cbs_write_extradata(ctx->cbc, bsf->par_out, frag);
if (err < 0) {
av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
goto fail;
}
}
err = 0;
fail:
ff_cbs_fragment_uninit(ctx->cbc, frag);
return err;
}
static void mpeg2_metadata_close(AVBSFContext *bsf)
{
MPEG2MetadataContext *ctx = bsf->priv_data;
ff_cbs_close(&ctx->cbc);
}
#define OFFSET(x) offsetof(MPEG2MetadataContext, x)
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 },
{ "frame_rate", "Set frame rate",
OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL,
{ .dbl = 0.0 }, 0, UINT_MAX },
{ "video_format", "Set video format (table 6-6)",
OFFSET(video_format), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 7 },
{ "colour_primaries", "Set colour primaries (table 6-7)",
OFFSET(colour_primaries), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255 },
{ "transfer_characteristics", "Set transfer characteristics (table 6-8)",
OFFSET(transfer_characteristics), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255 },
{ "matrix_coefficients", "Set matrix coefficients (table 6-9)",
OFFSET(matrix_coefficients), AV_OPT_TYPE_INT,
{ .i64 = -1 }, -1, 255 },
{ NULL }
};
static const AVClass mpeg2_metadata_class = {
.class_name = "mpeg2_metadata_bsf",
.item_name = av_default_item_name,
.option = mpeg2_metadata_options, |