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libavformat/tee: Add fifo support for tee

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Signed-off-by: Jan Sebechlebsky <sebechlebskyjan@gmail.com>
This commit is contained in:
Jan Sebechlebsky 2016-10-30 19:18:21 +01:00
parent 616513ef6e
commit 7c91ee01cc
2 changed files with 106 additions and 1 deletions
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20
doc/muxers.texi
View File

@ -1494,6 +1494,7 @@ Specify whether to remove all fragments when finished. Default 0 (do not remove)
@end table
@anchor{fifo}
@section fifo
The fifo pseudo-muxer allows the separation of encoding and muxing by using
@ -1601,6 +1602,18 @@ with the tee muxer; encoding can be a very expensive process. It is not
useful when using the libavformat API directly because it is then possible
to feed the same packets to several muxers directly.
@table @option
@item use_fifo @var{bool}
If set to 1, slave outputs will be processed in separate thread using @ref{fifo}
muxer. This allows to compensate for different speed/latency/reliability of
outputs and setup transparent recovery. By default this feature is turned off.
@item fifo_options
Options to pass to fifo pseudo-muxer instances. See @ref{fifo}.
@end table
The slave outputs are specified in the file name given to the muxer,
separated by '|'. If any of the slave name contains the '|' separator,
leading or trailing spaces or any special character, it must be
@ -1622,6 +1635,13 @@ output name suffix.
Specify a list of bitstream filters to apply to the specified
output.
@item use_fifo @var{bool}
This allows to override tee muxer use_fifo option for individual slave muxer.
@item fifo_options
This allows to override tee muxer fifo_options for individual slave muxer.
See @ref{fifo}.
It is possible to specify to which streams a given bitstream filter
applies, by appending a stream specifier to the option separated by
@code{/}. @var{spec} must be a stream specifier (see @ref{Format

87
libavformat/tee.c
View File

@ -40,6 +40,8 @@ typedef struct {
AVBSFContext **bsfs; ///< bitstream filters per stream
SlaveFailurePolicy on_fail;
int use_fifo;
AVDictionary *fifo_options;
/** map from input to output streams indexes,
* disabled output streams are set to -1 */
@ -52,15 +54,28 @@ typedef struct TeeContext {
unsigned nb_slaves;
unsigned nb_alive;
TeeSlave *slaves;
int use_fifo;
AVDictionary *fifo_options;
char *fifo_options_str;
} TeeContext;
static const char *const slave_delim = "|";
static const char *const slave_bsfs_spec_sep = "/";
static const char *const slave_select_sep = ",";
#define OFFSET(x) offsetof(TeeContext, x)
static const AVOption options[] = {
{"use_fifo", "Use fifo pseudo-muxer to separate actual muxers from encoder",
OFFSET(use_fifo), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},
{"fifo_options", "fifo pseudo-muxer options", OFFSET(fifo_options_str),
AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, AV_OPT_FLAG_ENCODING_PARAM},
{NULL}
};
static const AVClass tee_muxer_class = {
.class_name = "Tee muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
@ -81,6 +96,29 @@ static inline int parse_slave_failure_policy_option(const char *opt, TeeSlave *t
return AVERROR(EINVAL);
}
static int parse_slave_fifo_options(const char *use_fifo,
const char *fifo_options, TeeSlave *tee_slave)
{
int ret = 0;
if (use_fifo) {
/*TODO - change this to use proper function for parsing boolean
* options when there is one */
if (av_match_name(use_fifo, "true,y,yes,enable,enabled,on,1")) {
tee_slave->use_fifo = 1;
} else if (av_match_name(use_fifo, "false,n,no,disable,disabled,off,0")) {
tee_slave->use_fifo = 0;
} else {
return AVERROR(EINVAL);
}
}
if (fifo_options)
ret = av_dict_parse_string(&tee_slave->fifo_options, fifo_options, "=", ":", 0);
return ret;
}
static int close_slave(TeeSlave *tee_slave)
{
AVFormatContext *avf;
@ -125,6 +163,7 @@ static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
AVDictionaryEntry *entry;
char *filename;
char *format = NULL, *select = NULL, *on_fail = NULL;
char *use_fifo = NULL, *fifo_options_str = NULL;
AVFormatContext *avf2 = NULL;
AVStream *st, *st2;
int stream_count;
@ -145,6 +184,8 @@ static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
STEAL_OPTION("f", format);
STEAL_OPTION("select", select);
STEAL_OPTION("onfail", on_fail);
STEAL_OPTION("use_fifo", use_fifo);
STEAL_OPTION("fifo_options", fifo_options_str);
ret = parse_slave_failure_policy_option(on_fail, tee_slave);
if (ret < 0) {
@ -153,7 +194,39 @@ static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
goto end;
}
ret = avformat_alloc_output_context2(&avf2, NULL, format, filename);
ret = parse_slave_fifo_options(use_fifo, fifo_options_str, tee_slave);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR, "Error parsing fifo options: %s\n", av_err2str(ret));
goto end;
}
if (tee_slave->use_fifo) {
if (options) {
char *format_options_str = NULL;
ret = av_dict_get_string(options, &format_options_str, '=', ':');
if (ret < 0)
goto end;
ret = av_dict_set(&tee_slave->fifo_options, "format_options", format_options_str,
AV_DICT_DONT_STRDUP_VAL);
if (ret < 0)
goto end;
}
if (format) {
ret = av_dict_set(&tee_slave->fifo_options, "fifo_format", format,
AV_DICT_DONT_STRDUP_VAL);
format = NULL;
if (ret < 0)
goto end;
}
av_dict_free(&options);
options = tee_slave->fifo_options;
}
ret = avformat_alloc_output_context2(&avf2, NULL,
tee_slave->use_fifo ? "fifo" :format, filename);
if (ret < 0)
goto end;
tee_slave->avf = avf2;
@ -394,6 +467,12 @@ static int tee_write_header(AVFormatContext *avf)
filename++;
}
if (tee->fifo_options_str) {
ret = av_dict_parse_string(&tee->fifo_options, tee->fifo_options_str, "=", ":", 0);
if (ret < 0)
goto fail;
}
if (!(tee->slaves = av_mallocz_array(nb_slaves, sizeof(*tee->slaves)))) {
ret = AVERROR(ENOMEM);
goto fail;
@ -401,6 +480,12 @@ static int tee_write_header(AVFormatContext *avf)
tee->nb_slaves = tee->nb_alive = nb_slaves;
for (i = 0; i < nb_slaves; i++) {
tee->slaves[i].use_fifo = tee->use_fifo;
ret = av_dict_copy(&tee->slaves[i].fifo_options, tee->fifo_options, 0);
if (ret < 0)
goto fail;
if ((ret = open_slave(avf, slaves[i], &tee->slaves[i])) < 0) {
ret = tee_process_slave_failure(avf, i, ret);
if (ret < 0)