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lavf/tee: add support for bitstream filtering

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This allows to apply different bitstream filters to different outputs,
with no need to transcode.
This commit is contained in:
Stefano Sabatini 2013-07-05 18:33:30 +02:00
parent 29852ffc64
commit faf7c35655
3 changed files with 208 additions and 20 deletions
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18
doc/muxers.texi
View File

@ -852,11 +852,27 @@ leading or trailing spaces or any special character, it must be
escaped (see the ``Quoting and escaping'' section in the ffmpeg-utils
manual).
Options can be specified for each slave by prepending them as a list of
Muxer options can be specified for each slave by prepending them as a list of
@var{key}=@var{value} pairs separated by ':', between square brackets. If
the options values contain a special character or the ':' separator, they
must be escaped; note that this is a second level escaping.
The following special options are also recognized:
@table @option
@item f
Specify the format name. Useful if it cannot be guessed from the
output name suffix.
@item bsfs[/@var{spec}]
Specify a list of bitstream filters to apply to the specified
output. It is possible to specify to which streams a given bitstream
filter applies, by appending a stream specifier to the option
separated by @code{/}. If the stream specifier is not specified, the
bistream filters will be applied to all streams in the output.
Several bitstream filters can be specified, separated by ",".
@end table
Example: encode something and both archive it in a WebM file and stream it
as MPEG-TS over UDP (the streams need to be explicitly mapped):

208
libavformat/tee.c
View File

@ -27,16 +27,22 @@
#define MAX_SLAVES 16
typedef struct {
AVFormatContext *avf;
AVBitStreamFilterContext **bsfs; ///< bitstream filters per stream
} TeeSlave;
typedef struct TeeContext {
const AVClass *class;
unsigned nb_slaves;
AVFormatContext *slaves[MAX_SLAVES];
TeeSlave slaves[MAX_SLAVES];
} TeeContext;
static const char *const slave_delim = "|";
static const char *const slave_opt_open = "[";
static const char *const slave_opt_close = "]";
static const char *const slave_opt_delim = ":]"; /* must have the close too */
static const char *const slave_bsfs_spec_sep = "/";
static const AVClass tee_muxer_class = {
.class_name = "Tee muxer",
@ -82,7 +88,47 @@ fail:
return ret;
}
static int open_slave(AVFormatContext *avf, char *slave, AVFormatContext **ravf)
/**
* Parse list of bitstream filters and add them to the list of filters
* pointed to by bsfs.
*
* The list must be specified in the form:
* BSFS ::= BSF[,BSFS]
*/
static int parse_bsfs(void *log_ctx, const char *bsfs_spec,
AVBitStreamFilterContext **bsfs)
{
char *bsf_name, *buf, *saveptr;
int ret;
if (!(buf = av_strdup(bsfs_spec)))
return AVERROR(ENOMEM);
while (bsf_name = av_strtok(buf, ",", &saveptr)) {
AVBitStreamFilterContext *bsf = av_bitstream_filter_init(bsf_name);
if (!bsf) {
av_log(log_ctx, AV_LOG_ERROR,
"Cannot initialize bitstream filter with name '%s', "
"unknown filter or internal error happened\n",
bsf_name);
ret = AVERROR_UNKNOWN;
goto end;
}
/* append bsf context to the list of bsf contexts */
*bsfs = bsf;
bsfs = &bsf->next;
buf = NULL;
}
end:
av_free(buf);
return ret;
}
static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
{
int i, ret;
AVDictionary *options = NULL;
@ -102,14 +148,13 @@ static int open_slave(AVFormatContext *avf, char *slave, AVFormatContext **ravf)
ret = avformat_alloc_output_context2(&avf2, NULL, format, filename);
if (ret < 0)
goto fail;
av_free(format);
goto end;
for (i = 0; i < avf->nb_streams; i++) {
st = avf->streams[i];
if (!(st2 = avformat_new_stream(avf2, NULL))) {
ret = AVERROR(ENOMEM);
goto fail;
goto end;
}
st2->id = st->id;
st2->r_frame_rate = st->r_frame_rate;
@ -122,34 +167,84 @@ static int open_slave(AVFormatContext *avf, char *slave, AVFormatContext **ravf)
st2->avg_frame_rate = st->avg_frame_rate;
av_dict_copy(&st2->metadata, st->metadata, 0);
if ((ret = avcodec_copy_context(st2->codec, st->codec)) < 0)
goto fail;
goto end;
}
if (!(avf2->oformat->flags & AVFMT_NOFILE)) {
if ((ret = avio_open(&avf2->pb, filename, AVIO_FLAG_WRITE)) < 0) {
av_log(avf, AV_LOG_ERROR, "Slave '%s': error opening: %s\n",
slave, av_err2str(ret));
goto fail;
goto end;
}
}
if ((ret = avformat_write_header(avf2, &options)) < 0) {
av_log(avf, AV_LOG_ERROR, "Slave '%s': error writing header: %s\n",
slave, av_err2str(ret));
goto fail;
goto end;
}
tee_slave->avf = avf2;
tee_slave->bsfs = av_calloc(avf2->nb_streams, sizeof(TeeSlave));
if (!tee_slave->bsfs) {
ret = AVERROR(ENOMEM);
goto end;
}
entry = NULL;
while (entry = av_dict_get(options, "bsfs", NULL, AV_DICT_IGNORE_SUFFIX)) {
const char *spec = entry->key + strlen("bsfs");
if (*spec) {
if (strspn(spec, slave_bsfs_spec_sep) != 1) {
av_log(avf, AV_LOG_ERROR,
"Specifier separator in '%s' is '%c', but only characters '%s' "
"are allowed\n", entry->key, *spec, slave_bsfs_spec_sep);
return AVERROR(EINVAL);
}
spec++; /* consume separator */
}
for (i = 0; i < avf2->nb_streams; i++) {
ret = avformat_match_stream_specifier(avf2, avf2->streams[i], spec);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR,
"Invalid stream specifier '%s' in bsfs option '%s' for slave "
"output '%s'\n", spec, entry->key, filename);
goto end;
}
if (ret > 0) {
av_log(avf, AV_LOG_DEBUG, "spec:%s bsfs:%s matches stream %d of slave "
"output '%s'\n", spec, entry->value, i, filename);
if (tee_slave->bsfs[i]) {
av_log(avf, AV_LOG_WARNING,
"Duplicate bsfs specification associated to stream %d of slave "
"output '%s', filters will be ignored\n", i, filename);
continue;
}
ret = parse_bsfs(avf, entry->value, &tee_slave->bsfs[i]);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR,
"Error parsing bitstream filter sequence '%s' associated to "
"stream %d of slave output '%s'\n", entry->value, i, filename);
goto end;
}
}
}
av_dict_set(&options, entry->key, NULL, 0);
}
if (options) {
entry = NULL;
while ((entry = av_dict_get(options, "", entry, AV_DICT_IGNORE_SUFFIX)))
av_log(avf2, AV_LOG_ERROR, "Unknown option '%s'\n", entry->key);
ret = AVERROR_OPTION_NOT_FOUND;
goto fail;
goto end;
}
*ravf = avf2;
return 0;
fail:
end:
av_free(format);
av_dict_free(&options);
return ret;
}
@ -158,14 +253,48 @@ static void close_slaves(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
AVFormatContext *avf2;
unsigned i;
unsigned i, j;
for (i = 0; i < tee->nb_slaves; i++) {
avf2 = tee->slaves[i];
avf2 = tee->slaves[i].avf;
for (j = 0; j < avf2->nb_streams; j++) {
AVBitStreamFilterContext *bsf_next, *bsf = tee->slaves[i].bsfs[j];
while (bsf) {
bsf_next = bsf->next;
av_bitstream_filter_close(bsf);
bsf = bsf_next;
}
}
avio_close(avf2->pb);
avf2->pb = NULL;
avformat_free_context(avf2);
tee->slaves[i] = NULL;
tee->slaves[i].avf = NULL;
}
}
static void log_slave(TeeSlave *slave, void *log_ctx, int log_level)
{
int i;
av_log(log_ctx, log_level, "filename:'%s' format:%s\n",
slave->avf->filename, slave->avf->oformat->name);
for (i = 0; i < slave->avf->nb_streams; i++) {
AVStream *st = slave->avf->streams[i];
AVBitStreamFilterContext *bsf = slave->bsfs[i];
av_log(log_ctx, log_level, " stream:%d codec:%s type:%s",
i, avcodec_get_name(st->codec->codec_id),
av_get_media_type_string(st->codec->codec_type));
if (bsf) {
av_log(log_ctx, log_level, " bsfs:");
while (bsf) {
av_log(log_ctx, log_level, "%s%s",
bsf->filter->name, bsf->next ? "," : "");
bsf = bsf->next;
}
}
av_log(log_ctx, log_level, "\n");
}
}
@ -195,6 +324,7 @@ static int tee_write_header(AVFormatContext *avf)
for (i = 0; i < nb_slaves; i++) {
if ((ret = open_slave(avf, slaves[i], &tee->slaves[i])) < 0)
goto fail;
log_slave(&tee->slaves[i], avf, AV_LOG_VERBOSE);
av_freep(&slaves[i]);
}
@ -208,6 +338,46 @@ fail:
return ret;
}
static int filter_packet(void *log_ctx, AVPacket *pkt,
AVFormatContext *fmt_ctx, AVBitStreamFilterContext *bsf_ctx)
{
AVCodecContext *enc_ctx = fmt_ctx->streams[pkt->stream_index]->codec;
int ret;
while (bsf_ctx) {
AVPacket new_pkt = *pkt;
ret = av_bitstream_filter_filter(bsf_ctx, enc_ctx, NULL,
&new_pkt.data, &new_pkt.size,
pkt->data, pkt->size,
pkt->flags & AV_PKT_FLAG_KEY);
if (ret == 0 && new_pkt.data != pkt->data && new_pkt.destruct) {
if ((ret = av_copy_packet(&new_pkt, pkt)) < 0)
break;
ret = 1;
}
if (ret > 0) {
av_free_packet(pkt);
new_pkt.buf = av_buffer_create(new_pkt.data, new_pkt.size,
av_buffer_default_free, NULL, 0);
if (!new_pkt.buf)
break;
}
*pkt = new_pkt;
bsf_ctx = bsf_ctx->next;
}
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Failed to filter bitstream with filter %s for stream %d in file '%s' with codec %s\n",
bsf_ctx->filter->name, pkt->stream_index, fmt_ctx->filename,
avcodec_get_name(enc_ctx->codec_id));
}
return ret;
}
static int tee_write_trailer(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
@ -216,7 +386,7 @@ static int tee_write_trailer(AVFormatContext *avf)
unsigned i;
for (i = 0; i < tee->nb_slaves; i++) {
avf2 = tee->slaves[i];
avf2 = tee->slaves[i].avf;
if ((ret = av_write_trailer(avf2)) < 0)
if (!ret_all)
ret_all = ret;
@ -241,7 +411,7 @@ static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt)
AVRational tb, tb2;
for (i = 0; i < tee->nb_slaves; i++) {
avf2 = tee->slaves[i];
avf2 = tee->slaves[i].avf;
s = pkt->stream_index;
if (s >= avf2->nb_streams) {
if (!ret_all)
@ -259,6 +429,8 @@ static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt)
pkt2.pts = av_rescale_q(pkt->pts, tb, tb2);
pkt2.dts = av_rescale_q(pkt->dts, tb, tb2);
pkt2.duration = av_rescale_q(pkt->duration, tb, tb2);
filter_packet(avf2, &pkt2, avf2, tee->slaves[i].bsfs[s]);
if ((ret = av_interleaved_write_frame(avf2, &pkt2)) < 0)
if (!ret_all)
ret_all = ret;

2
libavformat/version.h
View File

@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 55
#define LIBAVFORMAT_VERSION_MINOR 13
#define LIBAVFORMAT_VERSION_MICRO 102
#define LIBAVFORMAT_VERSION_MICRO 103
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \