diff options
Diffstat (limited to 'libavformat/tee.c')
| -rw-r--r-- | libavformat/tee.c | 480 |
1 files changed, 480 insertions, 0 deletions
diff --git a/libavformat/tee.c b/libavformat/tee.c new file mode 100644 index 0000000000..139070556c --- /dev/null +++ b/libavformat/tee.c @@ -0,0 +1,480 @@ +/* + * 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/opt.h" +#include "internal.h" +#include "avformat.h" +#include "avio_internal.h" + +#define MAX_SLAVES 16 + +typedef struct { + AVFormatContext *avf; + AVBitStreamFilterContext **bsfs; ///< bitstream filters per stream + + /** map from input to output streams indexes, + * disabled output streams are set to -1 */ + int *stream_map; +} TeeSlave; + +typedef struct TeeContext { + const AVClass *class; + unsigned nb_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 char *const slave_select_sep = ","; + +static const AVClass tee_muxer_class = { + .class_name = "Tee muxer", + .item_name = av_default_item_name, + .version = LIBAVUTIL_VERSION_INT, +}; + +static int parse_slave_options(void *log, char *slave, + AVDictionary **options, char **filename) +{ + const char *p; + char *key, *val; + int ret; + + if (!strspn(slave, slave_opt_open)) { + *filename = slave; + return 0; + } + p = slave + 1; + if (strspn(p, slave_opt_close)) { + *filename = (char *)p + 1; + return 0; + } + while (1) { + ret = av_opt_get_key_value(&p, "=", slave_opt_delim, 0, &key, &val); + if (ret < 0) { + av_log(log, AV_LOG_ERROR, "No option found near \"%s\"\n", p); + goto fail; + } + ret = av_dict_set(options, key, val, + AV_DICT_DONT_STRDUP_KEY | AV_DICT_DONT_STRDUP_VAL); + if (ret < 0) + goto fail; + if (strspn(p, slave_opt_close)) + break; + p++; + } + *filename = (char *)p + 1; + return 0; + +fail: + av_dict_free(options); + return ret; +} + +/** + * 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, *dup, *saveptr; + int ret = 0; + + if (!(dup = 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(dup); + return ret; +} + +static int open_slave(AVFormatContext *avf, char *slave, TeeSlave *tee_slave) +{ + int i, ret; + AVDictionary *options = NULL; + AVDictionaryEntry *entry; + char *filename; + char *format = NULL, *select = 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 = parse_slave_options(avf, slave, &options, &filename)) < 0) + return ret; + +#define STEAL_OPTION(option, field) do { \ + if ((entry = av_dict_get(options, option, NULL, 0))) { \ + field = entry->value; \ + entry->value = NULL; /* prevent it from being freed */ \ + av_dict_set(&options, option, NULL, 0); \ + } \ + } while (0) + + STEAL_OPTION("f", format); + STEAL_OPTION("select", select); + + ret = avformat_alloc_output_context2(&avf2, NULL, format, filename); + if (ret < 0) + goto end; + av_dict_copy(&avf2->metadata, avf->metadata, 0); + avf2->opaque = avf->opaque; + avf2->io_open = avf->io_open; + avf2->io_close = avf->io_close; + + 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++; + + if (!(st2 = avformat_new_stream(avf2, NULL))) { + ret = AVERROR(ENOMEM); + goto end; + } + st2->id = st->id; + st2->r_frame_rate = st->r_frame_rate; + st2->time_base = st->time_base; + st2->start_time = st->start_time; + st2->duration = st->duration; + st2->nb_frames = st->nb_frames; + st2->disposition = st->disposition; + st2->sample_aspect_ratio = st->sample_aspect_ratio; + 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 end; + } + + if (!(avf2->oformat->flags & AVFMT_NOFILE)) { + if ((ret = avf2->io_open(avf2, &avf2->pb, filename, AVIO_FLAG_WRITE, NULL)) < 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->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 end; + } + +end: + av_free(format); + av_free(select); + av_dict_free(&options); + av_freep(&tmp_select); + return ret; +} + +static void close_slaves(AVFormatContext *avf) +{ + TeeContext *tee = avf->priv_data; + AVFormatContext *avf2; + unsigned i, j; + + for (i = 0; i < tee->nb_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; + } + } + av_freep(&tee->slaves[i].stream_map); + av_freep(&tee->slaves[i].bsfs); + + ff_format_io_close(avf2, &avf2->pb); + avformat_free_context(avf2); + 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"); + } +} + +static int tee_write_header(AVFormatContext *avf) +{ + TeeContext *tee = avf->priv_data; + unsigned nb_slaves = 0, i; + const char *filename = avf->filename; + char *slaves[MAX_SLAVES]; + int ret; + + while (*filename) { + if (nb_slaves == MAX_SLAVES) { + av_log(avf, AV_LOG_ERROR, "Maximum %d slave muxers reached.\n", + MAX_SLAVES); + ret = AVERROR_PATCHWELCOME; + goto fail; + } + if (!(slaves[nb_slaves++] = av_get_token(&filename, slave_delim))) { + ret = AVERROR(ENOMEM); + goto fail; + } + if (strspn(filename, slave_delim)) + filename++; + } + + 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]); + } + + tee->nb_slaves = nb_slaves; + + for (i = 0; i < avf->nb_streams; i++) { + int j, mapped = 0; + for (j = 0; j < tee->nb_slaves; j++) + 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); + } + return 0; + +fail: + for (i = 0; i < nb_slaves; i++) + av_freep(&slaves[i]); + close_slaves(avf); + return ret; +} + +static int tee_write_trailer(AVFormatContext *avf) +{ + TeeContext *tee = avf->priv_data; + AVFormatContext *avf2; + int ret_all = 0, ret; + unsigned i; + + for (i = 0; i < tee->nb_slaves; i++) { + avf2 = tee->slaves[i].avf; + if ((ret = av_write_trailer(avf2)) < 0) + if (!ret_all) + ret_all = ret; + if (!(avf2->oformat->flags & AVFMT_NOFILE)) + ff_format_io_close(avf2, &avf2->pb); + } + close_slaves(avf); + return ret_all; +} + +static int tee_write_packet(AVFormatContext *avf, AVPacket *pkt) +{ + TeeContext *tee = avf->priv_data; + AVFormatContext *avf2; + AVPacket pkt2; + int ret_all = 0, ret; + unsigned i, s; + int s2; + AVRational tb, tb2; + + for (i = 0; i < tee->nb_slaves; i++) { + avf2 = tee->slaves[i].avf; + s = pkt->stream_index; + s2 = tee->slaves[i].stream_map[s]; + if (s2 < 0) + continue; + + if ((ret = av_copy_packet(&pkt2, pkt)) < 0 || + (ret = av_dup_packet(&pkt2))< 0) + if (!ret_all) { + ret_all = ret; + continue; + } + tb = avf ->streams[s ]->time_base; + tb2 = avf2->streams[s2]->time_base; + 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); + pkt2.stream_index = s2; + + if ((ret = av_apply_bitstream_filters(avf2->streams[s2]->codec, &pkt2, + tee->slaves[i].bsfs[s2])) < 0 || + (ret = av_interleaved_write_frame(avf2, &pkt2)) < 0) + if (!ret_all) + ret_all = ret; + } + return ret_all; +} + +AVOutputFormat ff_tee_muxer = { + .name = "tee", + .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, + .priv_class = &tee_muxer_class, + .flags = AVFMT_NOFILE, +}; |