386 lines
12 KiB
C
386 lines
12 KiB
C
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/*
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* Copyright (c) 2014 Martin Storsjo
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <string.h>
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#include "libavformat/avformat.h"
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#include "libavutil/avstring.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mathematics.h"
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static int usage(const char *argv0, int ret)
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{
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fprintf(stderr, "%s -out foo.mpd file1\n", argv0);
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return ret;
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}
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struct Track {
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const char *name;
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int64_t duration;
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int bitrate;
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int track_id;
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int is_audio, is_video;
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int width, height;
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int sample_rate, channels;
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int timescale;
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char codec_str[30];
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int64_t sidx_start, sidx_length;
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};
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struct Tracks {
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int nb_tracks;
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int64_t duration;
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struct Track **tracks;
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int multiple_tracks_per_file;
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};
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static void set_codec_str(AVCodecParameters *codecpar, char *str, int size)
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{
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switch (codecpar->codec_id) {
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case AV_CODEC_ID_H264:
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snprintf(str, size, "avc1");
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if (codecpar->extradata_size >= 4 && codecpar->extradata[0] == 1) {
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av_strlcatf(str, size, ".%02x%02x%02x",
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codecpar->extradata[1], codecpar->extradata[2],
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codecpar->extradata[3]);
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}
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break;
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case AV_CODEC_ID_AAC:
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snprintf(str, size, "mp4a.40"); // 0x40 is the mp4 object type for AAC
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if (codecpar->extradata_size >= 2) {
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int aot = codecpar->extradata[0] >> 3;
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if (aot == 31)
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aot = ((AV_RB16(codecpar->extradata) >> 5) & 0x3f) + 32;
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av_strlcatf(str, size, ".%d", aot);
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}
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break;
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}
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}
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static int find_sidx(struct Tracks *tracks, int start_index,
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const char *file)
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{
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int err = 0;
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AVIOContext *f = NULL;
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int i;
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if ((err = avio_open2(&f, file, AVIO_FLAG_READ, NULL, NULL)) < 0)
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goto fail;
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while (!f->eof_reached) {
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int64_t pos = avio_tell(f);
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int32_t size, tag;
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size = avio_rb32(f);
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tag = avio_rb32(f);
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if (size < 8)
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break;
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if (tag == MKBETAG('s', 'i', 'd', 'x')) {
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for (i = start_index; i < tracks->nb_tracks; i++) {
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struct Track *track = tracks->tracks[i];
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if (!track->sidx_start) {
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track->sidx_start = pos;
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track->sidx_length = size;
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} else if (pos == track->sidx_start + track->sidx_length) {
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track->sidx_length = pos + size - track->sidx_start;
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}
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}
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}
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if (avio_seek(f, pos + size, SEEK_SET) != pos + size)
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break;
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}
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fail:
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if (f)
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avio_close(f);
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return err;
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}
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static int handle_file(struct Tracks *tracks, const char *file)
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{
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AVFormatContext *ctx = NULL;
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int err = 0, i, orig_tracks = tracks->nb_tracks;
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char errbuf[50], *ptr;
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struct Track *track;
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err = avformat_open_input(&ctx, file, NULL, NULL);
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if (err < 0) {
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av_strerror(err, errbuf, sizeof(errbuf));
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fprintf(stderr, "Unable to open %s: %s\n", file, errbuf);
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return 1;
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}
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err = avformat_find_stream_info(ctx, NULL);
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if (err < 0) {
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av_strerror(err, errbuf, sizeof(errbuf));
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fprintf(stderr, "Unable to identify %s: %s\n", file, errbuf);
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goto fail;
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}
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if (ctx->nb_streams < 1) {
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fprintf(stderr, "No streams found in %s\n", file);
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goto fail;
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}
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if (ctx->nb_streams > 1)
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tracks->multiple_tracks_per_file = 1;
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for (i = 0; i < ctx->nb_streams; i++) {
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struct Track **temp;
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AVStream *st = ctx->streams[i];
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if (st->codecpar->bit_rate == 0) {
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fprintf(stderr, "Skipping track %d in %s as it has zero bitrate\n",
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st->id, file);
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continue;
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}
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track = av_mallocz(sizeof(*track));
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if (!track) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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temp = av_realloc_array(tracks->tracks, tracks->nb_tracks + 1,
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sizeof(*tracks->tracks));
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if (!temp) {
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av_free(track);
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err = AVERROR(ENOMEM);
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goto fail;
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}
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tracks->tracks = temp;
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tracks->tracks[tracks->nb_tracks] = track;
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track->name = file;
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if ((ptr = strrchr(file, '/')))
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track->name = ptr + 1;
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track->bitrate = st->codecpar->bit_rate;
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track->track_id = st->id;
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track->timescale = st->time_base.den;
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track->duration = st->duration;
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track->is_audio = st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO;
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track->is_video = st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
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if (!track->is_audio && !track->is_video) {
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fprintf(stderr,
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"Track %d in %s is neither video nor audio, skipping\n",
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track->track_id, file);
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av_freep(&tracks->tracks[tracks->nb_tracks]);
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continue;
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}
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tracks->duration = FFMAX(tracks->duration,
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av_rescale_rnd(track->duration, AV_TIME_BASE,
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track->timescale, AV_ROUND_UP));
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if (track->is_audio) {
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track->channels = st->codecpar->channels;
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track->sample_rate = st->codecpar->sample_rate;
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}
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if (track->is_video) {
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track->width = st->codecpar->width;
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track->height = st->codecpar->height;
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}
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set_codec_str(st->codecpar, track->codec_str, sizeof(track->codec_str));
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tracks->nb_tracks++;
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}
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avformat_close_input(&ctx);
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err = find_sidx(tracks, orig_tracks, file);
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fail:
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if (ctx)
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avformat_close_input(&ctx);
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return err;
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}
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static void write_time(FILE *out, int64_t time, int decimals, enum AVRounding round)
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{
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int seconds = time / AV_TIME_BASE;
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int fractions = time % AV_TIME_BASE;
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int minutes = seconds / 60;
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int hours = minutes / 60;
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fractions = av_rescale_rnd(fractions, pow(10, decimals), AV_TIME_BASE, round);
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seconds %= 60;
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minutes %= 60;
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fprintf(out, "PT");
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if (hours)
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fprintf(out, "%dH", hours);
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if (hours || minutes)
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fprintf(out, "%dM", minutes);
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fprintf(out, "%d.%0*dS", seconds, decimals, fractions);
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}
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static int output_mpd(struct Tracks *tracks, const char *filename)
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{
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FILE *out;
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int i, j, ret = 0;
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struct Track **adaptation_sets_buf[2] = { NULL };
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struct Track ***adaptation_sets;
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int nb_tracks_buf[2] = { 0 };
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int *nb_tracks;
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int set, nb_sets;
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if (!tracks->multiple_tracks_per_file) {
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adaptation_sets = adaptation_sets_buf;
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nb_tracks = nb_tracks_buf;
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nb_sets = 2;
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for (i = 0; i < 2; i++) {
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adaptation_sets[i] = av_malloc_array(tracks->nb_tracks, sizeof(*adaptation_sets[i]));
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if (!adaptation_sets[i]) {
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ret = AVERROR(ENOMEM);
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goto err;
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}
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}
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for (i = 0; i < tracks->nb_tracks; i++) {
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int set_index = -1;
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if (tracks->tracks[i]->is_video)
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set_index = 0;
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else if (tracks->tracks[i]->is_audio)
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set_index = 1;
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else
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continue;
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adaptation_sets[set_index][nb_tracks[set_index]++] = tracks->tracks[i];
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}
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} else {
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adaptation_sets = &tracks->tracks;
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nb_tracks = &tracks->nb_tracks;
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nb_sets = 1;
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}
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out = fopen(filename, "w");
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if (!out) {
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ret = AVERROR(errno);
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perror(filename);
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return ret;
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}
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fprintf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
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fprintf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"
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"\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
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"\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
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"\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
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"\tprofiles=\"urn:mpeg:dash:profile:isoff-on-demand:2011\"\n"
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"\ttype=\"static\"\n");
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fprintf(out, "\tmediaPresentationDuration=\"");
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write_time(out, tracks->duration, 1, AV_ROUND_DOWN);
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fprintf(out, "\"\n");
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fprintf(out, "\tminBufferTime=\"PT5S\">\n");
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fprintf(out, "\t<Period start=\"PT0.0S\">\n");
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for (set = 0; set < nb_sets; set++) {
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if (nb_tracks[set] == 0)
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continue;
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fprintf(out, "\t\t<AdaptationSet segmentAlignment=\"true\">\n");
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if (nb_sets == 1) {
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for (i = 0; i < nb_tracks[set]; i++) {
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struct Track *track = adaptation_sets[set][i];
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if (strcmp(track->name, adaptation_sets[set][0]->name))
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break;
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fprintf(out, "\t\t\t<ContentComponent id=\"%d\" contentType=\"%s\" />\n", track->track_id, track->is_audio ? "audio" : "video");
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}
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}
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for (i = 0; i < nb_tracks[set]; ) {
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struct Track *first_track = adaptation_sets[set][i];
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int width = 0, height = 0, sample_rate = 0, channels = 0, bitrate = 0;
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fprintf(out, "\t\t\t<Representation id=\"%d\" codecs=\"", i);
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for (j = i; j < nb_tracks[set]; j++) {
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struct Track *track = adaptation_sets[set][j];
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if (strcmp(track->name, first_track->name))
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break;
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if (track->is_audio) {
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sample_rate = track->sample_rate;
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channels = track->channels;
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}
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if (track->is_video) {
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width = track->width;
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height = track->height;
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}
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bitrate += track->bitrate;
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if (j > i)
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fprintf(out, ",");
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fprintf(out, "%s", track->codec_str);
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}
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fprintf(out, "\" mimeType=\"%s/mp4\" bandwidth=\"%d\"",
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width ? "video" : "audio", bitrate);
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if (width > 0 && height > 0)
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fprintf(out, " width=\"%d\" height=\"%d\"", width, height);
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if (sample_rate > 0)
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fprintf(out, " audioSamplingRate=\"%d\"", sample_rate);
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fprintf(out, ">\n");
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if (channels > 0)
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fprintf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", channels);
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fprintf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", first_track->name);
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fprintf(out, "\t\t\t\t<SegmentBase indexRange=\"%"PRId64"-%"PRId64"\" />\n", first_track->sidx_start, first_track->sidx_start + first_track->sidx_length - 1);
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fprintf(out, "\t\t\t</Representation>\n");
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i = j;
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}
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fprintf(out, "\t\t</AdaptationSet>\n");
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}
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fprintf(out, "\t</Period>\n");
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fprintf(out, "</MPD>\n");
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fclose(out);
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err:
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for (i = 0; i < 2; i++)
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av_free(adaptation_sets_buf[i]);
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return ret;
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}
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static void clean_tracks(struct Tracks *tracks)
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{
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int i;
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for (i = 0; i < tracks->nb_tracks; i++) {
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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;
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|