[FFmpeg-cvslog] tools: Add a sidxindex tool
Martin Storsjö
git at videolan.org
Mon Nov 17 23:26:49 CET 2014
ffmpeg | branch: master | Martin Storsjö <martin at martin.st> | Wed Oct 29 11:43:34 2014 +0200| [c302d034ba2690a935df8bf7e4f5d44ed86e8d5c] | committer: Martin Storsjö
tools: Add a sidxindex tool
This tool can write an MPD file for fragmented MP4 files with
a sidx index at the start of the file.
Signed-off-by: Martin Storsjö <martin at martin.st>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c302d034ba2690a935df8bf7e4f5d44ed86e8d5c
---
libavformat/Makefile | 1 +
tools/sidxindex.c | 410 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 411 insertions(+)
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 7ed53a7..15f205a 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -412,3 +412,4 @@ TOOLS = aviocat \
ismindex \
pktdumper \
probetest \
+ sidxindex \
diff --git a/tools/sidxindex.c b/tools/sidxindex.c
new file mode 100644
index 0000000..da41d09
--- /dev/null
+++ b/tools/sidxindex.c
@@ -0,0 +1,410 @@
+/*
+ * Copyright (c) 2014 Martin Storsjo
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "libavformat/avformat.h"
+#include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mathematics.h"
+
+static int usage(const char *argv0, int ret)
+{
+ fprintf(stderr, "%s -out foo.mpd file1\n", argv0);
+ return ret;
+}
+
+struct Track {
+ const char *name;
+ int64_t duration;
+ int bitrate;
+ int track_id;
+ int is_audio, is_video;
+ int width, height;
+ int sample_rate, channels;
+ int timescale;
+ char codec_str[30];
+ int64_t sidx_start, sidx_length;
+ int64_t earliest_presentation;
+ uint32_t earliest_presentation_timescale;
+};
+
+struct Tracks {
+ int nb_tracks;
+ int64_t duration;
+ struct Track **tracks;
+ int multiple_tracks_per_file;
+};
+
+static void set_codec_str(AVCodecContext *codec, char *str, int size)
+{
+ switch (codec->codec_id) {
+ case AV_CODEC_ID_H264:
+ snprintf(str, size, "avc1");
+ if (codec->extradata_size >= 4 && codec->extradata[0] == 1) {
+ av_strlcatf(str, size, ".%02x%02x%02x",
+ codec->extradata[1], codec->extradata[2], codec->extradata[3]);
+ }
+ break;
+ case AV_CODEC_ID_AAC:
+ snprintf(str, size, "mp4a.40"); // 0x40 is the mp4 object type for AAC
+ 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);
+ }
+ break;
+ }
+}
+
+static int find_sidx(struct Tracks *tracks, int start_index,
+ const char *file)
+{
+ int err = 0;
+ AVIOContext *f = NULL;
+ int i;
+
+ if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
+ goto fail;
+
+ while (!f->eof_reached) {
+ int64_t pos = avio_tell(f);
+ int32_t size, tag;
+
+ size = avio_rb32(f);
+ tag = avio_rb32(f);
+ if (size < 8)
+ break;
+ if (tag == MKBETAG('s', 'i', 'd', 'x')) {
+ int version, track_id;
+ uint32_t timescale;
+ int64_t earliest_presentation;
+ version = avio_r8(f);
+ avio_rb24(f); /* flags */
+ track_id = avio_rb32(f);
+ timescale = avio_rb32(f);
+ earliest_presentation = version ? avio_rb64(f) : avio_rb32(f);
+ for (i = start_index; i < tracks->nb_tracks; i++) {
+ struct Track *track = tracks->tracks[i];
+ if (!track->sidx_start) {
+ track->sidx_start = pos;
+ track->sidx_length = size;
+ } else if (pos == track->sidx_start + track->sidx_length) {
+ track->sidx_length = pos + size - track->sidx_start;
+ }
+ if (track->track_id == track_id) {
+ track->earliest_presentation = earliest_presentation;
+ track->earliest_presentation_timescale = timescale;
+ }
+ }
+ }
+ if (avio_seek(f, pos + size, SEEK_SET) != pos + size)
+ break;
+ }
+
+fail:
+ if (f)
+ avio_close(f);
+ return err;
+}
+
+static int handle_file(struct Tracks *tracks, const char *file)
+{
+ AVFormatContext *ctx = NULL;
+ int err = 0, i, orig_tracks = tracks->nb_tracks;
+ char errbuf[50], *ptr;
+ struct Track *track;
+
+ err = avformat_open_input(&ctx, file, NULL, NULL);
+ if (err < 0) {
+ av_strerror(err, errbuf, sizeof(errbuf));
+ fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
+ return 1;
+ }
+
+ err = avformat_find_stream_info(ctx, NULL);
+ if (err < 0) {
+ av_strerror(err, errbuf, sizeof(errbuf));
+ fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
+ goto fail;
+ }
+
+ if (ctx->nb_streams < 1) {
+ fprintf(stderr, "No streams found in %s\n", file);
+ goto fail;
+ }
+ if (ctx->nb_streams > 1)
+ tracks->multiple_tracks_per_file = 1;
+
+ for (i = 0; i < ctx->nb_streams; i++) {
+ struct Track **temp;
+ AVStream *st = ctx->streams[i];
+
+ if (st->codec->bit_rate == 0) {
+ fprintf(stderr, "Skipping track %d in %s as it has zero bitrate\n",
+ st->id, file);
+ continue;
+ }
+
+ track = av_mallocz(sizeof(*track));
+ if (!track) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+ temp = av_realloc(tracks->tracks,
+ sizeof(*tracks->tracks) * (tracks->nb_tracks + 1));
+ if (!temp) {
+ av_free(track);
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+ tracks->tracks = temp;
+ tracks->tracks[tracks->nb_tracks] = track;
+
+ track->name = file;
+ if ((ptr = strrchr(file, '/')))
+ track->name = ptr + 1;
+
+ track->bitrate = st->codec->bit_rate;
+ track->track_id = st->id;
+ track->timescale = st->time_base.den;
+ track->duration = st->duration;
+ track->is_audio = st->codec->codec_type == AVMEDIA_TYPE_AUDIO;
+ track->is_video = st->codec->codec_type == AVMEDIA_TYPE_VIDEO;
+
+ if (!track->is_audio && !track->is_video) {
+ fprintf(stderr,
+ "Track %d in %s is neither video nor audio, skipping\n",
+ track->track_id, file);
+ av_freep(&tracks->tracks[tracks->nb_tracks]);
+ continue;
+ }
+
+ tracks->duration = FFMAX(tracks->duration,
+ av_rescale_rnd(track->duration, AV_TIME_BASE,
+ track->timescale, AV_ROUND_UP));
+
+ if (track->is_audio) {
+ track->channels = st->codec->channels;
+ track->sample_rate = st->codec->sample_rate;
+ }
+ if (track->is_video) {
+ track->width = st->codec->width;
+ track->height = st->codec->height;
+ }
+ set_codec_str(st->codec, track->codec_str, sizeof(track->codec_str));
+
+ tracks->nb_tracks++;
+ }
+
+ avformat_close_input(&ctx);
+
+ err = find_sidx(tracks, orig_tracks, file);
+
+fail:
+ if (ctx)
+ avformat_close_input(&ctx);
+ return err;
+}
+
+static void write_time(FILE *out, int64_t time, int decimals, enum AVRounding round)
+{
+ int seconds = time / AV_TIME_BASE;
+ int fractions = time % AV_TIME_BASE;
+ int minutes = seconds / 60;
+ int hours = minutes / 60;
+ fractions = av_rescale_rnd(fractions, pow(10, decimals), AV_TIME_BASE, round);
+ seconds %= 60;
+ minutes %= 60;
+ fprintf(out, "PT");
+ if (hours)
+ fprintf(out, "%dH", hours);
+ if (hours || minutes)
+ fprintf(out, "%dM", minutes);
+ fprintf(out, "%d.%0*dS", seconds, decimals, fractions);
+}
+
+static int output_mpd(struct Tracks *tracks, const char *filename)
+{
+ FILE *out;
+ int i, j, ret = 0;
+ struct Track **adaptation_sets_buf[2] = { NULL };
+ struct Track ***adaptation_sets;
+ int nb_tracks_buf[2] = { 0 };
+ int *nb_tracks;
+ int set, nb_sets;
+ int64_t latest_start = 0;
+
+ if (!tracks->multiple_tracks_per_file) {
+ adaptation_sets = adaptation_sets_buf;
+ nb_tracks = nb_tracks_buf;
+ nb_sets = 2;
+ for (i = 0; i < 2; i++) {
+ adaptation_sets[i] = av_malloc(sizeof(*adaptation_sets[i]) * tracks->nb_tracks);
+ if (!adaptation_sets[i]) {
+ ret = AVERROR(ENOMEM);
+ goto err;
+ }
+ }
+ for (i = 0; i < tracks->nb_tracks; i++) {
+ int set_index = -1;
+ if (tracks->tracks[i]->is_video)
+ set_index = 0;
+ else if (tracks->tracks[i]->is_audio)
+ set_index = 1;
+ else
+ continue;
+ adaptation_sets[set_index][nb_tracks[set_index]++] = tracks->tracks[i];
+ }
+ } else {
+ adaptation_sets = &tracks->tracks;
+ nb_tracks = &tracks->nb_tracks;
+ nb_sets = 1;
+ }
+
+ out = fopen(filename, "w");
+ if (!out) {
+ ret = AVERROR(errno);
+ perror(filename);
+ return ret;
+ }
+ fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
+ fprintf(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-on-demand:2011\"\n"
+ "\ttype=\"static\"\n");
+ fprintf(out, "\tmediaPresentationDuration=\"");
+ write_time(out, tracks->duration, 1, AV_ROUND_DOWN);
+ fprintf(out, "\"\n");
+ fprintf(out, "\tminBufferTime=\"PT5S\">\n");
+
+ for (i = 0; i < tracks->nb_tracks; i++) {
+ int64_t start = av_rescale_rnd(tracks->tracks[i]->earliest_presentation,
+ AV_TIME_BASE,
+ tracks->tracks[i]->earliest_presentation_timescale,
+ AV_ROUND_UP);
+ latest_start = FFMAX(start, latest_start);
+ }
+ fprintf(out, "\t<Period start=\"");
+ write_time(out, latest_start, 3, AV_ROUND_UP);
+ fprintf(out, "\">\n");
+
+
+ for (set = 0; set < nb_sets; set++) {
+ if (nb_tracks[set] == 0)
+ continue;
+ fprintf(out, "\t\t<AdaptationSet segmentAlignment=\"true\">\n");
+ if (nb_sets == 1) {
+ for (i = 0; i < nb_tracks[set]; i++) {
+ struct Track *track = adaptation_sets[set][i];
+ if (strcmp(track->name, adaptation_sets[set][0]->name))
+ break;
+ fprintf(out, "\t\t\t<ContentComponent id=\"%d\" contentType=\"%s\" />\n", track->track_id, track->is_audio ? "audio" : "video");
+ }
+ }
+
+ for (i = 0; i < nb_tracks[set]; ) {
+ struct Track *first_track = adaptation_sets[set][i];
+ int width = 0, height = 0, sample_rate = 0, channels = 0, bitrate = 0;
+ fprintf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/mp4\" codecs=\"", i);
+ for (j = i; j < nb_tracks[set]; j++) {
+ struct Track *track = adaptation_sets[set][j];
+ if (strcmp(track->name, first_track->name))
+ break;
+ if (track->is_audio) {
+ sample_rate = track->sample_rate;
+ channels = track->channels;
+ }
+ if (track->is_video) {
+ width = track->width;
+ height = track->height;
+ }
+ bitrate += track->bitrate;
+ if (j > i)
+ fprintf(out, ",");
+ fprintf(out, "%s", track->codec_str);
+ }
+ fprintf(out, "\" bandwidth=\"%d\"", bitrate);
+ if (width > 0 && height > 0)
+ fprintf(out, " width=\"%d\" height=\"%d\"", width, height);
+ if (sample_rate > 0)
+ fprintf(out, " audioSamplingRate=\"%d\"", sample_rate);
+ fprintf(out, ">\n");
+ if (channels > 0)
+ fprintf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", channels);
+ fprintf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", first_track->name);
+ fprintf(out, "\t\t\t\t<SegmentBase indexRange=\"%"PRId64"-%"PRId64"\" />\n", first_track->sidx_start, first_track->sidx_start + first_track->sidx_length - 1);
+ fprintf(out, "\t\t\t</Representation>\n");
+ i = j;
+ }
+ fprintf(out, "\t\t</AdaptationSet>\n");
+ }
+ fprintf(out, "\t</Period>\n");
+ fprintf(out, "</MPD>\n");
+
+ fclose(out);
+err:
+ for (i = 0; i < 2; i++)
+ av_free(adaptation_sets_buf[i]);
+ return ret;
+}
+
+static void clean_tracks(struct Tracks *tracks)
+{
+ int i;
+ for (i = 0; i < tracks->nb_tracks; i++) {
+ av_freep(&tracks->tracks[i]);
+ }
+ av_freep(&tracks->tracks);
+ tracks->nb_tracks = 0;
+}
+
+int main(int argc, char **argv)
+{
+ const char *out = NULL;
+ struct Tracks tracks = { 0 };
+ int i;
+
+ av_register_all();
+
+ for (i = 1; i < argc; i++) {
+ if (!strcmp(argv[i], "-out")) {
+ out = argv[i + 1];
+ i++;
+ } else if (argv[i][0] == '-') {
+ return usage(argv[0], 1);
+ } else {
+ if (handle_file(&tracks, argv[i]))
+ return 1;
+ }
+ }
+ if (!tracks.nb_tracks || !out)
+ return usage(argv[0], 1);
+
+ output_mpd(&tracks, out);
+
+ clean_tracks(&tracks);
+
+ return 0;
+}
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