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ffmpeg/libavformat/tee.c

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/*
* Tee pseudo-muxer
* Copyright (c) 2012 Nicolas George
*
* 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/avutil.h"
#include "libavutil/avstring.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavcodec/bsf.h"
#include "internal.h"
#include "avformat.h"
#include "mux.h"
#include "tee_common.h"
typedef enum {
ON_SLAVE_FAILURE_ABORT = 1,
ON_SLAVE_FAILURE_IGNORE = 2
} SlaveFailurePolicy;
#define DEFAULT_SLAVE_FAILURE_POLICY ON_SLAVE_FAILURE_ABORT
typedef struct {
AVFormatContext *avf;
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 */
int *stream_map;
int header_written;
} TeeSlave;
typedef struct TeeContext {
const AVClass *class;
unsigned nb_slaves;
unsigned nb_alive;
TeeSlave *slaves;
int use_fifo;
AVDictionary *fifo_options;
} 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),
AV_OPT_TYPE_DICT, {.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,
};
static inline int parse_slave_failure_policy_option(const char *opt, TeeSlave *tee_slave)
{
if (!opt) {
tee_slave->on_fail = DEFAULT_SLAVE_FAILURE_POLICY;
return 0;
} else if (!av_strcasecmp("abort", opt)) {
tee_slave->on_fail = ON_SLAVE_FAILURE_ABORT;
return 0;
} else if (!av_strcasecmp("ignore", opt)) {
tee_slave->on_fail = ON_SLAVE_FAILURE_IGNORE;
return 0;
}
/* Set failure behaviour to abort, so invalid option error will not be ignored */
tee_slave->on_fail = ON_SLAVE_FAILURE_ABORT;
return AVERROR(EINVAL);
}
static int parse_slave_fifo_policy(const char *use_fifo, TeeSlave *tee_slave)
{
/*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);
}
return 0;
}
static int parse_slave_fifo_options(const char *fifo_options, TeeSlave *tee_slave)
{
return av_dict_parse_string(&tee_slave->fifo_options, fifo_options, "=", ":", 0);
}
static int close_slave(TeeSlave *tee_slave)
{
AVFormatContext *avf;
unsigned i;
int ret = 0;
av_dict_free(&tee_slave->fifo_options);
avf = tee_slave->avf;
if (!avf)
return 0;
if (tee_slave->header_written)
ret = av_write_trailer(avf);
if (tee_slave->bsfs) {
for (i = 0; i < avf->nb_streams; ++i)
av_bsf_free(&tee_slave->bsfs[i]);
}
av_freep(&tee_slave->stream_map);
av_freep(&tee_slave->bsfs);
ff_format_io_close(avf, &avf->pb);
avformat_free_context(avf);
tee_slave->avf = NULL;
return ret;
}
static void close_slaves(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
unsigned i;
for (i = 0; i < tee->nb_slaves; i++) {
close_slave(&tee->slaves[i]);
}
av_freep(&tee->slaves);
}
static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave)
{
int i, ret;
AVDictionary *options = NULL, *bsf_options = NULL;
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;
int fullret;
char *subselect = NULL, *next_subselect = NULL, *first_subselect = NULL, *tmp_select = NULL;
if ((ret = ff_tee_parse_slave_options(avf, slave, &options, &filename)) < 0)
return ret;
#define CONSUME_OPTION(option, field, action) do { \
if ((entry = av_dict_get(options, option, NULL, 0))) { \
field = entry->value; \
{ action } \
av_dict_set(&options, option, NULL, 0); \
} \
} while (0)
#define STEAL_OPTION(option, field) \
CONSUME_OPTION(option, field, \
entry->value = NULL; /* prevent it from being freed */)
#define PROCESS_OPTION(option, field, function, on_error) \
CONSUME_OPTION(option, field, if ((ret = function) < 0) { { on_error } goto end; })
STEAL_OPTION("f", format);
STEAL_OPTION("select", select);
PROCESS_OPTION("onfail", on_fail,
parse_slave_failure_policy_option(on_fail, tee_slave),
av_log(avf, AV_LOG_ERROR, "Invalid onfail option value, "
"valid options are 'abort' and 'ignore'\n"););
PROCESS_OPTION("use_fifo", use_fifo,
parse_slave_fifo_policy(use_fifo, tee_slave),
av_log(avf, AV_LOG_ERROR, "Error parsing fifo options: %s\n",
av_err2str(ret)););
PROCESS_OPTION("fifo_options", fifo_options_str,
parse_slave_fifo_options(fifo_options_str, tee_slave), ;);
entry = NULL;
while ((entry = av_dict_get(options, "bsfs", entry, AV_DICT_IGNORE_SUFFIX))) {
/* trim out strlen("bsfs") characters from key */
av_dict_set(&bsf_options, entry->key + 4, entry->value, 0);
av_dict_set(&options, entry->key, NULL, 0);
}
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_opts", 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;
tee_slave->fifo_options = NULL;
}
ret = avformat_alloc_output_context2(&avf2, NULL,
tee_slave->use_fifo ? "fifo" :format, filename);
if (ret < 0)
goto end;
tee_slave->avf = avf2;
av_dict_copy(&avf2->metadata, avf->metadata, 0);
avf2->opaque = avf->opaque;
avf2->io_open = avf->io_open;
avf2->io_close2 = avf->io_close2;
avf2->interrupt_callback = avf->interrupt_callback;
avf2->flags = avf->flags;
avf2->strict_std_compliance = avf->strict_std_compliance;
tee_slave->stream_map = av_calloc(avf->nb_streams, sizeof(*tee_slave->stream_map));
if (!tee_slave->stream_map) {
ret = AVERROR(ENOMEM);
goto end;
}
stream_count = 0;
for (i = 0; i < avf->nb_streams; i++) {
st = avf->streams[i];
if (select) {
tmp_select = av_strdup(select); // av_strtok is destructive so we regenerate it in each loop
if (!tmp_select) {
ret = AVERROR(ENOMEM);
goto end;
}
fullret = 0;
first_subselect = tmp_select;
next_subselect = NULL;
while (subselect = av_strtok(first_subselect, slave_select_sep, &next_subselect)) {
first_subselect = NULL;
ret = avformat_match_stream_specifier(avf, avf->streams[i], subselect);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR,
"Invalid stream specifier '%s' for output '%s'\n",
subselect, slave);
goto end;
}
if (ret != 0) {
fullret = 1; // match
break;
}
}
av_freep(&tmp_select);
if (fullret == 0) { /* no match */
tee_slave->stream_map[i] = -1;
continue;
}
}
tee_slave->stream_map[i] = stream_count++;
st2 = ff_stream_clone(avf2, st);
if (!st2) {
ret = AVERROR(ENOMEM);
goto end;
}
}
ret = ff_format_output_open(avf2, filename, &options);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR, "Slave '%s': error opening: %s\n", slave,
av_err2str(ret));
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 end;
}
tee_slave->header_written = 1;
tee_slave->bsfs = av_calloc(avf2->nb_streams, sizeof(*tee_slave->bsfs));
if (!tee_slave->bsfs) {
ret = AVERROR(ENOMEM);
goto end;
}
entry = NULL;
while (entry = av_dict_get(bsf_options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
const char *spec = entry->key;
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);
ret = AVERROR(EINVAL);
goto end;
}
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 = av_bsf_list_parse_str(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(&bsf_options, entry->key, NULL, 0);
}
for (i = 0; i < avf->nb_streams; i++){
int target_stream = tee_slave->stream_map[i];
if (target_stream < 0)
continue;
if (!tee_slave->bsfs[target_stream]) {
/* Add pass-through bitstream filter */
ret = av_bsf_get_null_filter(&tee_slave->bsfs[target_stream]);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR,
"Failed to create pass-through bitstream filter: %s\n",
av_err2str(ret));
goto end;
}
}
tee_slave->bsfs[target_stream]->time_base_in = avf->streams[i]->time_base;
ret = avcodec_parameters_copy(tee_slave->bsfs[target_stream]->par_in,
avf->streams[i]->codecpar);
if (ret < 0)
goto end;
ret = av_bsf_init(tee_slave->bsfs[target_stream]);
if (ret < 0) {
av_log(avf, AV_LOG_ERROR,
"Failed to initialize bitstream filter(s): %s\n",
av_err2str(ret));
goto end;
}
}
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 end;
}
end:
av_free(format);
av_free(select);
av_dict_free(&options);
av_dict_free(&bsf_options);
av_freep(&tmp_select);
return ret;
}
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->url, slave->avf->oformat->name);
for (i = 0; i < slave->avf->nb_streams; i++) {
AVStream *st = slave->avf->streams[i];
AVBSFContext *bsf = slave->bsfs[i];
const char *bsf_name;
av_log(log_ctx, log_level, " stream:%d codec:%s type:%s",
i, avcodec_get_name(st->codecpar->codec_id),
av_get_media_type_string(st->codecpar->codec_type));
bsf_name = bsf->filter->priv_class ?
bsf->filter->priv_class->item_name(bsf) : bsf->filter->name;
av_log(log_ctx, log_level, " bsfs: %s\n", bsf_name);
}
}
static int tee_process_slave_failure(AVFormatContext *avf, unsigned slave_idx, int err_n)
{
TeeContext *tee = avf->priv_data;
TeeSlave *tee_slave = &tee->slaves[slave_idx];
tee->nb_alive--;
close_slave(tee_slave);
if (!tee->nb_alive) {
av_log(avf, AV_LOG_ERROR, "All tee outputs failed.\n");
return err_n;
} else if (tee_slave->on_fail == ON_SLAVE_FAILURE_ABORT) {
av_log(avf, AV_LOG_ERROR, "Slave muxer #%u failed, aborting.\n", slave_idx);
return err_n;
} else {
av_log(avf, AV_LOG_ERROR, "Slave muxer #%u failed: %s, continuing with %u/%u slaves.\n",
slave_idx, av_err2str(err_n), tee->nb_alive, tee->nb_slaves);
return 0;
}
}
static int tee_write_header(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
unsigned nb_slaves = 0, i;
const char *filename = avf->url;
char **slaves = NULL;
int ret;
while (*filename) {
char *slave = av_get_token(&filename, slave_delim);
if (!slave) {
ret = AVERROR(ENOMEM);
goto fail;
}
ret = av_dynarray_add_nofree(&slaves, &nb_slaves, slave);
if (ret < 0) {
av_free(slave);
goto fail;
}
if (strspn(filename, slave_delim))
filename++;
}
if (!FF_ALLOCZ_TYPED_ARRAY(tee->slaves, nb_slaves)) {
ret = AVERROR(ENOMEM);
goto fail;
}
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)
goto fail;
} else {
log_slave(&tee->slaves[i], avf, AV_LOG_VERBOSE);
}
av_freep(&slaves[i]);
}
for (i = 0; i < avf->nb_streams; i++) {
int j, mapped = 0;
for (j = 0; j < tee->nb_slaves; j++)
if (tee->slaves[j].avf)
mapped += tee->slaves[j].stream_map[i] >= 0;
if (!mapped)
av_log(avf, AV_LOG_WARNING, "Input stream #%d is not mapped "
"to any slave.\n", i);
}
av_free(slaves);
return 0;
fail:
for (i = 0; i < nb_slaves; i++)
av_freep(&slaves[i]);
close_slaves(avf);
av_free(slaves);
return ret;
}
static int tee_write_trailer(AVFormatContext *avf)
{
TeeContext *tee = avf->priv_data;
int ret_all = 0, ret;
unsigned i;
for (i = 0; i < tee->nb_slaves; i++) {
if ((ret = close_slave(&tee->slaves[i])) < 0) {
ret = tee_process_slave_failure(avf, i, ret);
if (!ret_all && ret < 0)
ret_all = ret;
}
}
av_freep(&tee->slaves);
return ret_all;
}
static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt)
{
TeeContext *tee = avf->priv_data;
AVFormatContext *avf2;
AVBSFContext *bsfs;
AVPacket *const pkt2 = ffformatcontext(avf)->pkt;
int ret_all = 0, ret;
unsigned i, s;
int s2;
for (i = 0; i < tee->nb_slaves; i++) {
if (!(avf2 = tee->slaves[i].avf))
continue;
/* Flush slave if pkt is NULL*/
if (!pkt) {
ret = av_interleaved_write_frame(avf2, NULL);
if (ret < 0) {
ret = tee_process_slave_failure(avf, i, ret);
if (!ret_all && ret < 0)
ret_all = ret;
}
continue;
}
s = pkt->stream_index;
s2 = tee->slaves[i].stream_map[s];
if (s2 < 0)
continue;
if ((ret = av_packet_ref(pkt2, pkt)) < 0) {
if (!ret_all)
ret_all = ret;
continue;
}
bsfs = tee->slaves[i].bsfs[s2];
pkt2->stream_index = s2;
ret = av_bsf_send_packet(bsfs, pkt2);
if (ret < 0) {
av_packet_unref(pkt2);
av_log(avf, AV_LOG_ERROR, "Error while sending packet to bitstream filter: %s\n",
av_err2str(ret));
ret = tee_process_slave_failure(avf, i, ret);
if (!ret_all && ret < 0)
ret_all = ret;
}
while(1) {
ret = av_bsf_receive_packet(bsfs, pkt2);
if (ret == AVERROR(EAGAIN)) {
ret = 0;
break;
} else if (ret < 0) {
break;
}
av_packet_rescale_ts(pkt2, bsfs->time_base_out,
avf2->streams[s2]->time_base);
ret = av_interleaved_write_frame(avf2, pkt2);
if (ret < 0)
break;
};
if (ret < 0) {
ret = tee_process_slave_failure(avf, i, ret);
if (!ret_all && ret < 0)
ret_all = ret;
}
}
return ret_all;
}
const FFOutputFormat ff_tee_muxer = {
.p.name = "tee",
.p.long_name = NULL_IF_CONFIG_SMALL("Multiple muxer tee"),
.priv_data_size = sizeof(TeeContext),
.write_header = tee_write_header,
.write_trailer = tee_write_trailer,
.write_packet = tee_write_packet,
.p.priv_class = &tee_muxer_class,
#if FF_API_ALLOW_FLUSH
.p.flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH | AVFMT_TS_NEGATIVE,
#else
.p.flags = AVFMT_NOFILE | AVFMT_TS_NEGATIVE,
#endif
.flags_internal = FF_OFMT_FLAG_ALLOW_FLUSH,
};
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