/* * 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 <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; }; struct Tracks { int nb_tracks; int64_t duration; struct Track **tracks; int multiple_tracks_per_file; }; static void set_codec_str(AVCodecParameters *codecpar, char *str, int size) { switch (codecpar->codec_id) { case AV_CODEC_ID_H264: snprintf(str, size, "avc1"); if (codecpar->extradata_size >= 4 && codecpar->extradata[0] == 1) { av_strlcatf(str, size, ".%02x%02x%02x", codecpar->extradata[1], codecpar->extradata[2], codecpar->extradata[3]); } break; case AV_CODEC_ID_AAC: snprintf(str, size, "mp4a.40"); // 0x40 is the mp4 object type for AAC if (codecpar->extradata_size >= 2) { int aot = codecpar->extradata[0] >> 3; if (aot == 31) aot = ((AV_RB16(codecpar->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')) { 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 (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->codecpar->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_array(tracks->tracks, tracks->nb_tracks + 1, sizeof(*tracks->tracks)); 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->codecpar->bit_rate; track->track_id = st->id; track->timescale = st->time_base.den; track->duration = st->duration; track->is_audio = st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO; track->is_video = st->codecpar->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->codecpar->ch_layout.nb_channels; track->sample_rate = st->codecpar->sample_rate; } if (track->is_video) { track->width = st->codecpar->width; track->height = st->codecpar->height; } set_codec_str(st->codecpar, 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; 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_array(tracks->nb_tracks, sizeof(*adaptation_sets[i])); 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"); fprintf(out, "\t<Period start=\"PT0.0S\">\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\" 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, "\" mimeType=\"%s/mp4\" bandwidth=\"%d\"", width ? "video" : "audio", 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; 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; }