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-rw-r--r--libavformat/tee.c498
1 files changed, 498 insertions, 0 deletions
diff --git a/libavformat/tee.c b/libavformat/tee.c
new file mode 100644
index 0000000000..12ea0ea27d
--- /dev/null
+++ b/libavformat/tee.c
@@ -0,0 +1,498 @@
+/*
+ * 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 "avformat.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 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;
+
+ 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);
+
+ 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) {
+ ret = avformat_match_stream_specifier(avf, avf->streams[i], select);
+ if (ret < 0) {
+ av_log(avf, AV_LOG_ERROR,
+ "Invalid stream specifier '%s' for output '%s'\n",
+ select, slave);
+ goto end;
+ }
+
+ if (ret == 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 = 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 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);
+ 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);
+
+ avio_close(avf2->pb);
+ avf2->pb = NULL;
+ 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 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 = 0;
+
+ 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;
+ 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)) {
+ if ((ret = avio_close(avf2->pb)) < 0)
+ if (!ret_all)
+ ret_all = ret;
+ avf2->pb = NULL;
+ }
+ }
+ 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 = ret_all;
+ 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;
+
+ filter_packet(avf2, &pkt2, avf2, tee->slaves[i].bsfs[s2]);
+ if ((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,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 12:40:49 +0000