--- /dev/null
+/*
+ * MPEG-DASH ISO BMFF segmenter
+ * Copyright (c) 2014 Martin Storsjo
+ *
+ * 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 "config.h"
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
+#include "libavutil/time_internal.h"
+
+#include "avc.h"
+#include "avformat.h"
+#include "avio_internal.h"
+#include "internal.h"
+#include "isom.h"
+#include "os_support.h"
+#include "url.h"
+
+// See ISO/IEC 23009-1:2014 5.3.9.4.4
+typedef enum {
+ DASH_TMPL_ID_UNDEFINED = -1,
+ DASH_TMPL_ID_ESCAPE,
+ DASH_TMPL_ID_REP_ID,
+ DASH_TMPL_ID_NUMBER,
+ DASH_TMPL_ID_BANDWIDTH,
+ DASH_TMPL_ID_TIME,
+} DASHTmplId;
+
+typedef struct Segment {
+ char file[1024];
+ int64_t start_pos;
+ int range_length, index_length;
+ int64_t time;
+ int duration;
+ int n;
+} Segment;
+
+typedef struct OutputStream {
+ AVFormatContext *ctx;
+ int ctx_inited;
+ uint8_t iobuf[32768];
+ URLContext *out;
+ int packets_written;
+ char initfile[1024];
+ int64_t init_start_pos;
+ int init_range_length;
+ int nb_segments, segments_size, segment_index;
+ Segment **segments;
+ int64_t first_dts, start_dts, end_dts;
+ int bit_rate;
+ char bandwidth_str[64];
+
+ char codec_str[100];
+} OutputStream;
+
+typedef struct DASHContext {
+ const AVClass *class; /* Class for private options. */
+ int window_size;
+ int extra_window_size;
+ int min_seg_duration;
+ int remove_at_exit;
+ int use_template;
+ int use_timeline;
+ int single_file;
+ OutputStream *streams;
+ int has_video, has_audio;
+ int last_duration;
+ int total_duration;
+ char availability_start_time[100];
+ char dirname[1024];
+ const char *single_file_name;
+ const char *init_seg_name;
+ const char *media_seg_name;
+} DASHContext;
+
+static int dash_write(void *opaque, uint8_t *buf, int buf_size)
+{
+ OutputStream *os = opaque;
+ if (os->out)
+ ffurl_write(os->out, buf, buf_size);
+ return buf_size;
+}
+
+// RFC 6381
+static void set_codec_str(AVFormatContext *s, AVCodecContext *codec,
+ char *str, int size)
+{
+ const AVCodecTag *tags[2] = { NULL, NULL };
+ uint32_t tag;
+ if (codec->codec_type == AVMEDIA_TYPE_VIDEO)
+ tags[0] = ff_codec_movvideo_tags;
+ else if (codec->codec_type == AVMEDIA_TYPE_AUDIO)
+ tags[0] = ff_codec_movaudio_tags;
+ else
+ return;
+
+ tag = av_codec_get_tag(tags, codec->codec_id);
+ if (!tag)
+ return;
+ if (size < 5)
+ return;
+
+ AV_WL32(str, tag);
+ str[4] = '\0';
+ if (!strcmp(str, "mp4a") || !strcmp(str, "mp4v")) {
+ uint32_t oti;
+ tags[0] = ff_mp4_obj_type;
+ oti = av_codec_get_tag(tags, codec->codec_id);
+ if (oti)
+ av_strlcatf(str, size, ".%02x", oti);
+ else
+ return;
+
+ if (tag == MKTAG('m', 'p', '4', 'a')) {
+ if (codec->extradata_size >= 2) {
+ int aot = codec->extradata[0] >> 3;
+ if (aot == 31)
+ aot = ((AV_RB16(codec->extradata) >> 5) & 0x3f) + 32;
+ av_strlcatf(str, size, ".%d", aot);
+ }
+ } else if (tag == MKTAG('m', 'p', '4', 'v')) {
+ // Unimplemented, should output ProfileLevelIndication as a decimal number
+ av_log(s, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");
+ }
+ } else if (!strcmp(str, "avc1")) {
+ uint8_t *tmpbuf = NULL;
+ uint8_t *extradata = codec->extradata;
+ int extradata_size = codec->extradata_size;
+ if (!extradata_size)
+ return;
+ if (extradata[0] != 1) {
+ AVIOContext *pb;
+ if (avio_open_dyn_buf(&pb) < 0)
+ return;
+ if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {
+ avio_close_dyn_buf(pb, &tmpbuf);
+ av_free(tmpbuf);
+ return;
+ }
+ extradata_size = avio_close_dyn_buf(pb, &extradata);
+ tmpbuf = extradata;
+ }
+
+ if (extradata_size >= 4)
+ av_strlcatf(str, size, ".%02x%02x%02x",
+ extradata[1], extradata[2], extradata[3]);
+ av_free(tmpbuf);
+ }
+}
+
+static void dash_free(AVFormatContext *s)
+{
+ DASHContext *c = s->priv_data;
+ int i, j;
+ if (!c->streams)
+ return;
+ for (i = 0; i < s->nb_streams; i++) {
+ OutputStream *os = &c->streams[i];
+ if (os->ctx && os->ctx_inited)
+ av_write_trailer(os->ctx);
+ if (os->ctx && os->ctx->pb)
+ av_free(os->ctx->pb);
+ ffurl_close(os->out);
+ os->out = NULL;
+ if (os->ctx)
+ avformat_free_context(os->ctx);
+ for (j = 0; j < os->nb_segments; j++)
+ av_free(os->segments[j]);
+ av_free(os->segments);
+ }
+ av_freep(&c->streams);
+}
+
+static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext *c)
+{
+ int i, start_index = 0, start_number = 1;
+ if (c->window_size) {
+ start_index = FFMAX(os->nb_segments - c->window_size, 0);
+ start_number = FFMAX(os->segment_index - c->window_size, 1);
+ }
+
+ if (c->use_template) {
+ int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;
+ avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
+ if (!c->use_timeline)
+ avio_printf(out, "duration=\"%d\" ", c->last_duration);
+ avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);
+ if (c->use_timeline) {
+ avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
+ for (i = start_index; i < os->nb_segments; ) {
+ Segment *seg = os->segments[i];
+ int repeat = 0;
+ avio_printf(out, "\t\t\t\t\t\t<S ");
+ if (i == start_index)
+ avio_printf(out, "t=\"%"PRId64"\" ", seg->time);
+ avio_printf(out, "d=\"%d\" ", seg->duration);
+ while (i + repeat + 1 < os->nb_segments && os->segments[i + repeat + 1]->duration == seg->duration)
+ repeat++;
+ if (repeat > 0)
+ avio_printf(out, "r=\"%d\" ", repeat);
+ avio_printf(out, "/>\n");
+ i += 1 + repeat;
+ }
+ avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");
+ }
+ avio_printf(out, "\t\t\t\t</SegmentTemplate>\n");
+ } else if (c->single_file) {
+ avio_printf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", os->initfile);
+ avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%d\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
+ avio_printf(out, "\t\t\t\t\t<Initialization range=\"%"PRId64"-%"PRId64"\" />\n", os->init_start_pos, os->init_start_pos + os->init_range_length - 1);
+ for (i = start_index; i < os->nb_segments; i++) {
+ Segment *seg = os->segments[i];
+ avio_printf(out, "\t\t\t\t\t<SegmentURL mediaRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->range_length - 1);
+ if (seg->index_length)
+ avio_printf(out, "indexRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->index_length - 1);
+ avio_printf(out, "/>\n");
+ }
+ avio_printf(out, "\t\t\t\t</SegmentList>\n");
+ } else {
+ avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%d\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);
+ avio_printf(out, "\t\t\t\t\t<Initialization sourceURL=\"%s\" />\n", os->initfile);
+ for (i = start_index; i < os->nb_segments; i++) {
+ Segment *seg = os->segments[i];
+ avio_printf(out, "\t\t\t\t\t<SegmentURL media=\"%s\" />\n", seg->file);
+ }
+ avio_printf(out, "\t\t\t\t</SegmentList>\n");
+ }
+}
+
+static DASHTmplId dash_read_tmpl_id(const char *identifier, char *format_tag,
+ size_t format_tag_size, const char **ptr) {
+ const char *next_ptr;
+ DASHTmplId id_type = DASH_TMPL_ID_UNDEFINED;
+
+ if (av_strstart(identifier, "$$", &next_ptr)) {
+ id_type = DASH_TMPL_ID_ESCAPE;
+ *ptr = next_ptr;
+ } else if (av_strstart(identifier, "$RepresentationID$", &next_ptr)) {
+ id_type = DASH_TMPL_ID_REP_ID;
+ // default to basic format, as $RepresentationID$ identifiers
+ // are not allowed to have custom format-tags.
+ av_strlcpy(format_tag, "%d", format_tag_size);
+ *ptr = next_ptr;
+ } else { // the following identifiers may have an explicit format_tag
+ if (av_strstart(identifier, "$Number", &next_ptr))
+ id_type = DASH_TMPL_ID_NUMBER;
+ else if (av_strstart(identifier, "$Bandwidth", &next_ptr))
+ id_type = DASH_TMPL_ID_BANDWIDTH;
+ else if (av_strstart(identifier, "$Time", &next_ptr))
+ id_type = DASH_TMPL_ID_TIME;
+ else
+ id_type = DASH_TMPL_ID_UNDEFINED;
+
+ // next parse the dash format-tag and generate a c-string format tag
+ // (next_ptr now points at the first '%' at the beginning of the format-tag)
+ if (id_type != DASH_TMPL_ID_UNDEFINED) {
+ const char *number_format = DASH_TMPL_ID_TIME ? "lld" : "d";
+ if (next_ptr[0] == '$') { // no dash format-tag
+ snprintf(format_tag, format_tag_size, "%%%s", number_format);
+ *ptr = &next_ptr[1];
+ } else {
+ const char *width_ptr;
+ // only tolerate single-digit width-field (i.e. up to 9-digit width)
+ if (av_strstart(next_ptr, "%0", &width_ptr) &&
+ av_isdigit(width_ptr[0]) &&
+ av_strstart(&width_ptr[1], "d$", &next_ptr)) {
+ // yes, we're using a format tag to build format_tag.
+ snprintf(format_tag, format_tag_size, "%s%c%s", "%0", width_ptr[0], number_format);
+ *ptr = next_ptr;
+ } else {
+ av_log(NULL, AV_LOG_WARNING, "Failed to parse format-tag beginning with %s. Expected either a "
+ "closing '$' character or a format-string like '%%0[width]d', "
+ "where width must be a single digit\n", next_ptr);
+ id_type = DASH_TMPL_ID_UNDEFINED;
+ }
+ }
+ }
+ }
+ return id_type;
+}
+
+static void dash_fill_tmpl_params(char *dst, size_t buffer_size,
+ const char *template, int rep_id,
+ int number, int bit_rate,
+ int64_t time) {
+ int dst_pos = 0;
+ const char *t_cur = template;
+ while (dst_pos < buffer_size - 1 && *t_cur) {
+ char format_tag[7]; // May be "%d", "%0Xd", or "%0Xlld" (for $Time$), where X is in [0-9]
+ int n = 0;
+ DASHTmplId id_type;
+ const char *t_next = strchr(t_cur, '$'); // copy over everything up to the first '$' character
+ if (t_next) {
+ int num_copy_bytes = FFMIN(t_next - t_cur, buffer_size - dst_pos - 1);
+ av_strlcpy(&dst[dst_pos], t_cur, num_copy_bytes + 1);
+ // advance
+ dst_pos += num_copy_bytes;
+ t_cur = t_next;
+ } else { // no more DASH identifiers to substitute - just copy the rest over and break
+ av_strlcpy(&dst[dst_pos], t_cur, buffer_size - dst_pos);
+ break;
+ }
+
+ if (dst_pos >= buffer_size - 1 || !*t_cur)
+ break;
+
+ // t_cur is now pointing to a '$' character
+ id_type = dash_read_tmpl_id(t_cur, format_tag, sizeof(format_tag), &t_next);
+ switch (id_type) {
+ case DASH_TMPL_ID_ESCAPE:
+ av_strlcpy(&dst[dst_pos], "$", 2);
+ n = 1;
+ break;
+ case DASH_TMPL_ID_REP_ID:
+ n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, rep_id);
+ break;
+ case DASH_TMPL_ID_NUMBER:
+ n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, number);
+ break;
+ case DASH_TMPL_ID_BANDWIDTH:
+ n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, bit_rate);
+ break;
+ case DASH_TMPL_ID_TIME:
+ n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, time);
+ break;
+ case DASH_TMPL_ID_UNDEFINED:
+ // copy over one byte and advance
+ av_strlcpy(&dst[dst_pos], t_cur, 2);
+ n = 1;
+ t_next = &t_cur[1];
+ break;
+ }
+ // t_next points just past the processed identifier
+ // n is the number of bytes that were attempted to be written to dst
+ // (may have failed to write all because buffer_size).
+
+ // advance
+ dst_pos += FFMIN(n, buffer_size - dst_pos - 1);
+ t_cur = t_next;
+ }
+}
+
+static char *xmlescape(const char *str) {
+ int outlen = strlen(str)*3/2 + 6;
+ char *out = av_realloc(NULL, outlen + 1);
+ int pos = 0;
+ if (!out)
+ return NULL;
+ for (; *str; str++) {
+ if (pos + 6 > outlen) {
+ char *tmp;
+ outlen = 2 * outlen + 6;
+ tmp = av_realloc(out, outlen + 1);
+ if (!tmp) {
+ av_free(out);
+ return NULL;
+ }
+ out = tmp;
+ }
+ if (*str == '&') {
+ memcpy(&out[pos], "&", 5);
+ pos += 5;
+ } else if (*str == '<') {
+ memcpy(&out[pos], "<", 4);
+ pos += 4;
+ } else if (*str == '>') {
+ memcpy(&out[pos], ">", 4);
+ pos += 4;
+ } else if (*str == '\'') {
+ memcpy(&out[pos], "'", 6);
+ pos += 6;
+ } else if (*str == '\"') {
+ memcpy(&out[pos], """, 6);
+ pos += 6;
+ } else {
+ out[pos++] = *str;
+ }
+ }
+ out[pos] = '\0';
+ return out;
+}
+
+static void write_time(AVIOContext *out, int64_t time)
+{
+ int seconds = time / AV_TIME_BASE;
+ int fractions = time % AV_TIME_BASE;
+ int minutes = seconds / 60;
+ int hours = minutes / 60;
+ seconds %= 60;
+ minutes %= 60;
+ avio_printf(out, "PT");
+ if (hours)
+ avio_printf(out, "%dH", hours);
+ if (hours || minutes)
+ avio_printf(out, "%dM", minutes);
+ avio_printf(out, "%d.%dS", seconds, fractions / (AV_TIME_BASE / 10));
+}
+
+static int write_manifest(AVFormatContext *s, int final)
+{
+ DASHContext *c = s->priv_data;
+ AVIOContext *out;
+ char temp_filename[1024];
+ int ret, i;
+ AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);
+
+ snprintf(temp_filename, sizeof(temp_filename), "%s.tmp", s->filename);
+ ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
+ if (ret < 0) {
+ av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
+ return ret;
+ }
+ avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
+ avio_printf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
+ "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
+ "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
+ "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
+ "\tprofiles=\"urn:mpeg:dash:profile:isoff-live:2011\"\n"
+ "\ttype=\"%s\"\n", final ? "static" : "dynamic");
+ if (final) {
+ avio_printf(out, "\tmediaPresentationDuration=\"");
+ write_time(out, c->total_duration);
+ avio_printf(out, "\"\n");
+ } else {
+ int update_period = c->last_duration / AV_TIME_BASE;
+ if (c->use_template && !c->use_timeline)
+ update_period = 500;
+ avio_printf(out, "\tminimumUpdatePeriod=\"PT%dS\"\n", update_period);
+ avio_printf(out, "\tsuggestedPresentationDelay=\"PT%dS\"\n", c->last_duration / AV_TIME_BASE);
+ if (!c->availability_start_time[0] && s->nb_streams > 0 && c->streams[0].nb_segments > 0) {
+ time_t t = time(NULL);
+ struct tm *ptm, tmbuf;
+ ptm = gmtime_r(&t, &tmbuf);
+ if (ptm) {
+ if (!strftime(c->availability_start_time, sizeof(c->availability_start_time),
+ "%Y-%m-%dT%H:%M:%S", ptm))
+ c->availability_start_time[0] = '\0';
+ }
+ }
+ if (c->availability_start_time[0])
+ avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);
+ if (c->window_size && c->use_template) {
+ avio_printf(out, "\ttimeShiftBufferDepth=\"");
+ write_time(out, c->last_duration * c->window_size);
+ avio_printf(out, "\"\n");
+ }
+ }
+ avio_printf(out, "\tminBufferTime=\"");
+ write_time(out, c->last_duration);
+ avio_printf(out, "\">\n");
+ avio_printf(out, "\t<ProgramInformation>\n");
+ if (title) {
+ char *escaped = xmlescape(title->value);
+ avio_printf(out, "\t\t<Title>%s</Title>\n", escaped);
+ av_free(escaped);
+ }
+ avio_printf(out, "\t</ProgramInformation>\n");
+ if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {
+ OutputStream *os = &c->streams[0];
+ int start_index = FFMAX(os->nb_segments - c->window_size, 0);
+ int64_t start_time = av_rescale_q(os->segments[start_index]->time, s->streams[0]->time_base, AV_TIME_BASE_Q);
+ avio_printf(out, "\t<Period start=\"");
+ write_time(out, start_time);
+ avio_printf(out, "\">\n");
+ } else {
+ avio_printf(out, "\t<Period start=\"PT0.0S\">\n");
+ }
+
+ if (c->has_video) {
+ avio_printf(out, "\t\t<AdaptationSet id=\"video\" segmentAlignment=\"true\" bitstreamSwitching=\"true\">\n");
+ for (i = 0; i < s->nb_streams; i++) {
+ AVStream *st = s->streams[i];
+ OutputStream *os = &c->streams[i];
+ if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
+ continue;
+ avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/mp4\" codecs=\"%s\"%s width=\"%d\" height=\"%d\">\n", i, os->codec_str, os->bandwidth_str, st->codec->width, st->codec->height);
+ output_segment_list(&c->streams[i], out, c);
+ avio_printf(out, "\t\t\t</Representation>\n");
+ }
+ avio_printf(out, "\t\t</AdaptationSet>\n");
+ }
+ if (c->has_audio) {
+ avio_printf(out, "\t\t<AdaptationSet id=\"audio\" segmentAlignment=\"true\" bitstreamSwitching=\"true\">\n");
+ for (i = 0; i < s->nb_streams; i++) {
+ AVStream *st = s->streams[i];
+ OutputStream *os = &c->streams[i];
+ if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
+ continue;
+ avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/mp4\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n", i, os->codec_str, os->bandwidth_str, st->codec->sample_rate);
+ avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", st->codec->channels);
+ output_segment_list(&c->streams[i], out, c);
+ avio_printf(out, "\t\t\t</Representation>\n");
+ }
+ avio_printf(out, "\t\t</AdaptationSet>\n");
+ }
+ avio_printf(out, "\t</Period>\n");
+ avio_printf(out, "</MPD>\n");
+ avio_flush(out);
+ avio_close(out);
+ return ff_rename(temp_filename, s->filename, s);
+}
+
+static int dash_write_header(AVFormatContext *s)
+{
+ DASHContext *c = s->priv_data;
+ int ret = 0, i;
+ AVOutputFormat *oformat;
+ char *ptr;
+ char basename[1024];
+
+ if (c->single_file_name)
+ c->single_file = 1;
+ if (c->single_file)
+ c->use_template = 0;
+
+ av_strlcpy(c->dirname, s->filename, sizeof(c->dirname));
+ ptr = strrchr(c->dirname, '/');
+ if (ptr) {
+ av_strlcpy(basename, &ptr[1], sizeof(basename));
+ ptr[1] = '\0';
+ } else {
+ c->dirname[0] = '\0';
+ av_strlcpy(basename, s->filename, sizeof(basename));
+ }
+
+ ptr = strrchr(basename, '.');
+ if (ptr)
+ *ptr = '\0';
+
+ oformat = av_guess_format("mp4", NULL, NULL);
+ if (!oformat) {
+ ret = AVERROR_MUXER_NOT_FOUND;
+ goto fail;
+ }
+
+ c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
+ if (!c->streams) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ for (i = 0; i < s->nb_streams; i++) {
+ OutputStream *os = &c->streams[i];
+ AVFormatContext *ctx;
+ AVStream *st;
+ AVDictionary *opts = NULL;
+ char filename[1024];
+
+ os->bit_rate = s->streams[i]->codec->bit_rate ?
+ s->streams[i]->codec->bit_rate :
+ s->streams[i]->codec->rc_max_rate;
+ if (os->bit_rate) {
+ snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
+ " bandwidth=\"%d\"", os->bit_rate);
+ } else {
+ int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?
+ AV_LOG_ERROR : AV_LOG_WARNING;
+ av_log(s, level, "No bit rate set for stream %d\n", i);
+ if (s->strict_std_compliance >= FF_COMPLIANCE_STRICT) {
+ ret = AVERROR(EINVAL);
+ goto fail;
+ }
+ }
+
+ ctx = avformat_alloc_context();
+ if (!ctx) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+ os->ctx = ctx;
+ ctx->oformat = oformat;
+ ctx->interrupt_callback = s->interrupt_callback;
+
+ if (!(st = avformat_new_stream(ctx, NULL))) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+ avcodec_copy_context(st->codec, s->streams[i]->codec);
+ st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
+ st->time_base = s->streams[i]->time_base;
+ ctx->avoid_negative_ts = s->avoid_negative_ts;
+
+ ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, dash_write, NULL);
+ if (!ctx->pb) {
+ ret = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ if (c->single_file) {
+ if (c->single_file_name)
+ dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->single_file_name, i, 0, os->bit_rate, 0);
+ else
+ snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);
+ } else {
+ dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->init_seg_name, i, 0, os->bit_rate, 0);
+ }
+ snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
+ ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
+ if (ret < 0)
+ goto fail;
+ os->init_start_pos = 0;
+
+ av_dict_set(&opts, "movflags", "frag_custom+dash", 0);
+ if ((ret = avformat_write_header(ctx, &opts)) < 0) {
+ goto fail;
+ }
+ os->ctx_inited = 1;
+ avio_flush(ctx->pb);
+ av_dict_free(&opts);
+
+ if (c->single_file) {
+ os->init_range_length = avio_tell(ctx->pb);
+ } else {
+ ffurl_close(os->out);
+ os->out = NULL;
+ }
+
+ s->streams[i]->time_base = st->time_base;
+ // If the muxer wants to shift timestamps, request to have them shifted
+ // already before being handed to this muxer, so we don't have mismatches
+ // between the MPD and the actual segments.
+ s->avoid_negative_ts = ctx->avoid_negative_ts;
+ if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
+ c->has_video = 1;
+ else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
+ c->has_audio = 1;
+
+ set_codec_str(s, os->ctx->streams[0]->codec, os->codec_str, sizeof(os->codec_str));
+ os->first_dts = AV_NOPTS_VALUE;
+ os->segment_index = 1;
+ }
+
+ if (!c->has_video && c->min_seg_duration <= 0) {
+ av_log(s, AV_LOG_WARNING, "no video stream and no min seg duration set\n");
+ ret = AVERROR(EINVAL);
+ }
+ ret = write_manifest(s, 0);
+
+fail:
+ if (ret)
+ dash_free(s);
+ return ret;
+}
+
+static int add_segment(OutputStream *os, const char *file,
+ int64_t time, int duration,
+ int64_t start_pos, int64_t range_length,
+ int64_t index_length)
+{
+ int err;
+ Segment *seg;
+ if (os->nb_segments >= os->segments_size) {
+ os->segments_size = (os->segments_size + 1) * 2;
+ if ((err = av_reallocp(&os->segments, sizeof(*os->segments) *
+ os->segments_size)) < 0) {
+ os->segments_size = 0;
+ os->nb_segments = 0;
+ return err;
+ }
+ }
+ seg = av_mallocz(sizeof(*seg));
+ if (!seg)
+ return AVERROR(ENOMEM);
+ av_strlcpy(seg->file, file, sizeof(seg->file));
+ seg->time = time;
+ seg->duration = duration;
+ seg->start_pos = start_pos;
+ seg->range_length = range_length;
+ seg->index_length = index_length;
+ os->segments[os->nb_segments++] = seg;
+ os->segment_index++;
+ return 0;
+}
+
+static void write_styp(AVIOContext *pb)
+{
+ avio_wb32(pb, 24);
+ ffio_wfourcc(pb, "styp");
+ ffio_wfourcc(pb, "msdh");
+ avio_wb32(pb, 0); /* minor */
+ ffio_wfourcc(pb, "msdh");
+ ffio_wfourcc(pb, "msix");
+}
+
+static void find_index_range(AVFormatContext *s, const char *dirname,
+ const char *filename, int64_t pos,
+ int *index_length)
+{
+ char full_path[1024];
+ uint8_t buf[8];
+ URLContext *fd;
+ int ret;
+
+ snprintf(full_path, sizeof(full_path), "%s%s", dirname, filename);
+ ret = ffurl_open(&fd, full_path, AVIO_FLAG_READ, &s->interrupt_callback, NULL);
+ if (ret < 0)
+ return;
+ if (ffurl_seek(fd, pos, SEEK_SET) != pos) {
+ ffurl_close(fd);
+ return;
+ }
+ ret = ffurl_read(fd, buf, 8);
+ ffurl_close(fd);
+ if (ret < 8)
+ return;
+ if (AV_RL32(&buf[4]) != MKTAG('s', 'i', 'd', 'x'))
+ return;
+ *index_length = AV_RB32(&buf[0]);
+}
+
+static int dash_flush(AVFormatContext *s, int final, int stream)
+{
+ DASHContext *c = s->priv_data;
+ int i, ret = 0;
+ int cur_flush_segment_index = 0;
+ if (stream >= 0)
+ cur_flush_segment_index = c->streams[stream].segment_index;
+
+ for (i = 0; i < s->nb_streams; i++) {
+ OutputStream *os = &c->streams[i];
+ char filename[1024] = "", full_path[1024], temp_path[1024];
+ int64_t start_pos = avio_tell(os->ctx->pb);
+ int range_length, index_length = 0;
+
+ if (!os->packets_written)
+ continue;
+
+ // Flush the single stream that got a keyframe right now.
+ // Flush all audio streams as well, in sync with video keyframes,
+ // but not the other video streams.
+ if (stream >= 0 && i != stream) {
+ if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
+ continue;
+ // Make sure we don't flush audio streams multiple times, when
+ // all video streams are flushed one at a time.
+ if (c->has_video && os->segment_index > cur_flush_segment_index)
+ continue;
+ }
+
+ if (!c->single_file) {
+ dash_fill_tmpl_params(filename, sizeof(filename), c->media_seg_name, i, os->segment_index, os->bit_rate, os->start_dts);
+ snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, filename);
+ snprintf(temp_path, sizeof(temp_path), "%s.tmp", full_path);
+ ret = ffurl_open(&os->out, temp_path, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
+ if (ret < 0)
+ break;
+ write_styp(os->ctx->pb);
+ }
+ av_write_frame(os->ctx, NULL);
+ avio_flush(os->ctx->pb);
+ os->packets_written = 0;
+
+ range_length = avio_tell(os->ctx->pb) - start_pos;
+ if (c->single_file) {
+ find_index_range(s, c->dirname, os->initfile, start_pos, &index_length);
+ } else {
+ ffurl_close(os->out);
+ os->out = NULL;
+ ret = ff_rename(temp_path, full_path, s);
+ if (ret < 0)
+ break;
+ }
+ add_segment(os, filename, os->start_dts, os->end_dts - os->start_dts, start_pos, range_length, index_length);
+ }
+
+ if (c->window_size || (final && c->remove_at_exit)) {
+ for (i = 0; i < s->nb_streams; i++) {
+ OutputStream *os = &c->streams[i];
+ int j;
+ int remove = os->nb_segments - c->window_size - c->extra_window_size;
+ if (final && c->remove_at_exit)
+ remove = os->nb_segments;
+ if (remove > 0) {
+ for (j = 0; j < remove; j++) {
+ char filename[1024];
+ snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->segments[j]->file);
+ unlink(filename);
+ av_free(os->segments[j]);
+ }
+ os->nb_segments -= remove;
+ memmove(os->segments, os->segments + remove, os->nb_segments * sizeof(*os->segments));
+ }
+ }
+ }
+
+ if (ret >= 0)
+ ret = write_manifest(s, final);
+ return ret;
+}
+
+static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ DASHContext *c = s->priv_data;
+ AVStream *st = s->streams[pkt->stream_index];
+ OutputStream *os = &c->streams[pkt->stream_index];
+ int64_t seg_end_duration = (os->segment_index) * (int64_t) c->min_seg_duration;
+ int ret;
+
+ // If forcing the stream to start at 0, the mp4 muxer will set the start
+ // timestamps to 0. Do the same here, to avoid mismatches in duration/timestamps.
+ if (os->first_dts == AV_NOPTS_VALUE &&
+ s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO) {
+ pkt->pts -= pkt->dts;
+ pkt->dts = 0;
+ }
+
+ if (os->first_dts == AV_NOPTS_VALUE)
+ os->first_dts = pkt->dts;
+
+ if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
+ pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&
+ av_compare_ts(pkt->dts - os->first_dts, st->time_base,
+ seg_end_duration, AV_TIME_BASE_Q) >= 0) {
+ int64_t prev_duration = c->last_duration;
+
+ c->last_duration = av_rescale_q(pkt->dts - os->start_dts,
+ st->time_base,
+ AV_TIME_BASE_Q);
+ c->total_duration = av_rescale_q(pkt->dts - os->first_dts,
+ st->time_base,
+ AV_TIME_BASE_Q);
+
+ if ((!c->use_timeline || !c->use_template) && prev_duration) {
+ if (c->last_duration < prev_duration*9/10 ||
+ c->last_duration > prev_duration*11/10) {
+ av_log(s, AV_LOG_WARNING,
+ "Segment durations differ too much, enable use_timeline "
+ "and use_template, or keep a stricter keyframe interval\n");
+ }
+ }
+
+ if ((ret = dash_flush(s, 0, pkt->stream_index)) < 0)
+ return ret;
+ }
+
+ if (!os->packets_written)
+ os->start_dts = pkt->dts;
+ os->end_dts = pkt->dts + pkt->duration;
+ os->packets_written++;
+ return ff_write_chained(os->ctx, 0, pkt, s, 0);
+}
+
+static int dash_write_trailer(AVFormatContext *s)
+{
+ DASHContext *c = s->priv_data;
+
+ if (s->nb_streams > 0) {
+ OutputStream *os = &c->streams[0];
+ // If no segments have been written so far, try to do a crude
+ // guess of the segment duration
+ if (!c->last_duration)
+ c->last_duration = av_rescale_q(os->end_dts - os->start_dts,
+ s->streams[0]->time_base,
+ AV_TIME_BASE_Q);
+ c->total_duration = av_rescale_q(os->end_dts - os->first_dts,
+ s->streams[0]->time_base,
+ AV_TIME_BASE_Q);
+ }
+ dash_flush(s, 1, -1);
+
+ if (c->remove_at_exit) {
+ char filename[1024];
+ int i;
+ for (i = 0; i < s->nb_streams; i++) {
+ OutputStream *os = &c->streams[i];
+ snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
+ unlink(filename);
+ }
+ unlink(s->filename);
+ }
+
+ dash_free(s);
+ return 0;
+}
+
+#define OFFSET(x) offsetof(DASHContext, x)
+#define E AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+ { "window_size", "number of segments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
+ { "extra_window_size", "number of segments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E },
+ { "min_seg_duration", "minimum segment duration (in microseconds)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
+ { "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
+ { "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
+ { "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
+ { "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
+ { "single_file_name", "DASH-templated name to be used for baseURL. Implies storing all segments in one file, accessed using byte ranges", OFFSET(single_file_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
+ { "init_seg_name", "DASH-templated name to used for the initialization segment", OFFSET(init_seg_name), AV_OPT_TYPE_STRING, {.str = "init-stream$RepresentationID$.m4s"}, 0, 0, E },
+ { "media_seg_name", "DASH-templated name to used for the media segments", OFFSET(media_seg_name), AV_OPT_TYPE_STRING, {.str = "chunk-stream$RepresentationID$-$Number%05d$.m4s"}, 0, 0, E },
+ { NULL },
+};
+
+static const AVClass dash_class = {
+ .class_name = "dash muxer",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVOutputFormat ff_dash_muxer = {
+ .name = "dash",
+ .long_name = NULL_IF_CONFIG_SMALL("DASH Muxer"),
+ .priv_data_size = sizeof(DASHContext),
+ .audio_codec = AV_CODEC_ID_AAC,
+ .video_codec = AV_CODEC_ID_H264,
+ .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE | AVFMT_TS_NEGATIVE,
+ .write_header = dash_write_header,
+ .write_packet = dash_write_packet,
+ .write_trailer = dash_write_trailer,
+ .codec_tag = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 },
+ .priv_class = &dash_class,
+};
repositories / deb_ffmpeg.git / blobdiff