/* * Live smooth streaming fragmenter * Copyright (c) 2012 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 "config.h" #include <float.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #include "avformat.h" #include "internal.h" #include "os_support.h" #include "avc.h" #include "url.h" #include "isom.h" #include "libavutil/opt.h" #include "libavutil/avstring.h" #include "libavutil/mathematics.h" #include "libavutil/intreadwrite.h" typedef struct { char file[1024]; char infofile[1024]; int64_t start_time, duration; int n; int64_t start_pos, size; } Fragment; typedef struct { AVFormatContext *ctx; int ctx_inited; char dirname[1024]; uint8_t iobuf[32768]; URLContext *out; // Current output stream where all output is written URLContext *out2; // Auxillary output stream where all output also is written URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere int64_t tail_pos, cur_pos, cur_start_pos; int packets_written; const char *stream_type_tag; int nb_fragments, fragments_size, fragment_index; Fragment **fragments; const char *fourcc; char *private_str; int packet_size; int audio_tag; } OutputStream; typedef struct { const AVClass *class; /* Class for private options. */ int window_size; int extra_window_size; int lookahead_count; int min_frag_duration; int remove_at_exit; OutputStream *streams; int has_video, has_audio; int nb_fragments; } SmoothStreamingContext; static int ism_write(void *opaque, uint8_t *buf, int buf_size) { OutputStream *os = opaque; if (os->out) ffurl_write(os->out, buf, buf_size); if (os->out2) ffurl_write(os->out2, buf, buf_size); os->cur_pos += buf_size; if (os->cur_pos >= os->tail_pos) os->tail_pos = os->cur_pos; return buf_size; } static int64_t ism_seek(void *opaque, int64_t offset, int whence) { OutputStream *os = opaque; int i; if (whence != SEEK_SET) return AVERROR(ENOSYS); if (os->tail_out) { if (os->out) { ffurl_close(os->out); } if (os->out2) { ffurl_close(os->out2); } os->out = os->tail_out; os->out2 = NULL; os->tail_out = NULL; } if (offset >= os->cur_start_pos) { if (os->out) ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET); os->cur_pos = offset; return offset; } for (i = os->nb_fragments - 1; i >= 0; i--) { Fragment *frag = os->fragments[i]; if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) { int ret; AVDictionary *opts = NULL; os->tail_out = os->out; av_dict_set(&opts, "truncate", "0", 0); ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts); av_dict_free(&opts); if (ret < 0) { os->out = os->tail_out; os->tail_out = NULL; return ret; } av_dict_set(&opts, "truncate", "0", 0); ffurl_open(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts); av_dict_free(&opts); ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET); if (os->out2) ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET); os->cur_pos = offset; return offset; } } return AVERROR(EIO); } static void get_private_data(OutputStream *os) { AVCodecContext *codec = os->ctx->streams[0]->codec; uint8_t *ptr = codec->extradata; int size = codec->extradata_size; int i; if (codec->codec_id == AV_CODEC_ID_H264) { ff_avc_write_annexb_extradata(ptr, &ptr, &size); if (!ptr) ptr = codec->extradata; } if (!ptr) return; os->private_str = av_mallocz(2*size + 1); for (i = 0; i < size; i++) snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]); if (ptr != codec->extradata) av_free(ptr); } static void ism_free(AVFormatContext *s) { SmoothStreamingContext *c = s->priv_data; int i, j; if (!c->streams) return; for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; ffurl_close(os->out); ffurl_close(os->out2); ffurl_close(os->tail_out); os->out = os->out2 = os->tail_out = NULL; if (os->ctx && os->ctx_inited) av_write_trailer(os->ctx); if (os->ctx && os->ctx->pb) av_free(os->ctx->pb); if (os->ctx) avformat_free_context(os->ctx); av_free(os->private_str); for (j = 0; j < os->nb_fragments; j++) av_free(os->fragments[j]); av_free(os->fragments); } av_freep(&c->streams); } static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size) { int removed = 0, i, start = 0; if (os->nb_fragments <= 0) return; if (os->fragments[0]->n > 0) removed = 1; if (final) skip = 0; if (window_size) start = FFMAX(os->nb_fragments - skip - window_size, 0); for (i = start; i < os->nb_fragments - skip; i++) { Fragment *frag = os->fragments[i]; if (!final || removed) avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration); else avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration); } } static int write_manifest(AVFormatContext *s, int final) { SmoothStreamingContext *c = s->priv_data; AVIOContext *out; char filename[1024]; int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0; int64_t duration = 0; snprintf(filename, sizeof(filename), "%s/Manifest", s->filename); ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL); if (ret < 0) { av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", filename); return ret; } avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"); for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; if (os->nb_fragments > 0) { Fragment *last = os->fragments[os->nb_fragments - 1]; duration = last->start_time + last->duration; } if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { video_chunks = os->nb_fragments; video_streams++; } else { audio_chunks = os->nb_fragments; audio_streams++; } } if (!final) { duration = 0; video_chunks = audio_chunks = 0; } if (c->window_size) { video_chunks = FFMIN(video_chunks, c->window_size); audio_chunks = FFMIN(audio_chunks, c->window_size); } avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration); if (!final) avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count); avio_printf(out, ">\n"); if (c->has_video) { int last = -1, index = 0; avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks); for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO) continue; last = i; avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->width, s->streams[i]->codec->height, os->private_str); index++; } output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size); avio_printf(out, "</StreamIndex>\n"); } if (c->has_audio) { int last = -1, index = 0; avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks); for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO) continue; last = i; avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->sample_rate, s->streams[i]->codec->channels, os->packet_size, os->audio_tag, os->private_str); index++; } output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size); avio_printf(out, "</StreamIndex>\n"); } avio_printf(out, "</SmoothStreamingMedia>\n"); avio_flush(out); avio_close(out); return 0; } static int ism_write_header(AVFormatContext *s) { SmoothStreamingContext *c = s->priv_data; int ret = 0, i; AVOutputFormat *oformat; mkdir(s->filename, 0777); oformat = av_guess_format("ismv", 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 buf[10]; if (!s->streams[i]->codec->bit_rate) { av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i); ret = AVERROR(EINVAL); goto fail; } snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate); mkdir(os->dirname, 0777); 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; ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek); if (!ctx->pb) { ret = AVERROR(ENOMEM); goto fail; } snprintf(buf, sizeof(buf), "%d", c->lookahead_count); av_dict_set(&opts, "ism_lookahead", buf, 0); av_dict_set(&opts, "movflags", "frag_custom", 0); if ((ret = avformat_write_header(ctx, &opts)) < 0) { goto fail; } os->ctx_inited = 1; avio_flush(ctx->pb); av_dict_free(&opts); s->streams[i]->time_base = st->time_base; if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { c->has_video = 1; os->stream_type_tag = "video"; if (st->codec->codec_id == AV_CODEC_ID_H264) { os->fourcc = "H264"; } else if (st->codec->codec_id == AV_CODEC_ID_VC1) { os->fourcc = "WVC1"; } else { av_log(s, AV_LOG_ERROR, "Unsupported video codec\n"); ret = AVERROR(EINVAL); goto fail; } } else { c->has_audio = 1; os->stream_type_tag = "audio"; if (st->codec->codec_id == AV_CODEC_ID_AAC) { os->fourcc = "AACL"; os->audio_tag = 0xff; } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) { os->fourcc = "WMAP"; os->audio_tag = 0x0162; } else { av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n"); ret = AVERROR(EINVAL); goto fail; } os->packet_size = st->codec->block_align ? st->codec->block_align : 4; } get_private_data(os); } if (!c->has_video && c->min_frag_duration <= 0) { av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n"); ret = AVERROR(EINVAL); } ret = write_manifest(s, 0); fail: if (ret) ism_free(s); return ret; } static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size) { AVIOContext *in; int ret; uint32_t len; if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0) return ret; ret = AVERROR(EIO); *moof_size = avio_rb32(in); if (*moof_size < 8 || *moof_size > size) goto fail; if (avio_rl32(in) != MKTAG('m','o','o','f')) goto fail; len = avio_rb32(in); if (len > *moof_size) goto fail; if (avio_rl32(in) != MKTAG('m','f','h','d')) goto fail; avio_seek(in, len - 8, SEEK_CUR); avio_rb32(in); /* traf size */ if (avio_rl32(in) != MKTAG('t','r','a','f')) goto fail; while (avio_tell(in) < *moof_size) { uint32_t len = avio_rb32(in); uint32_t tag = avio_rl32(in); int64_t end = avio_tell(in) + len - 8; if (len < 8 || len >= *moof_size) goto fail; if (tag == MKTAG('u','u','i','d')) { const uint8_t tfxd[] = { 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6, 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2 }; uint8_t uuid[16]; avio_read(in, uuid, 16); if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) { avio_seek(in, 4, SEEK_CUR); *start_ts = avio_rb64(in); *duration = avio_rb64(in); ret = 0; break; } } avio_seek(in, end, SEEK_SET); } fail: avio_close(in); return ret; } static int add_fragment(OutputStream *os, const char *file, const char *infofile, int64_t start_time, int64_t duration, int64_t start_pos, int64_t size) { Fragment *frag; if (os->nb_fragments >= os->fragments_size) { os->fragments_size = (os->fragments_size + 1) * 2; os->fragments = av_realloc(os->fragments, sizeof(*os->fragments)*os->fragments_size); if (!os->fragments) return AVERROR(ENOMEM); } frag = av_mallocz(sizeof(*frag)); if (!frag) return AVERROR(ENOMEM); av_strlcpy(frag->file, file, sizeof(frag->file)); av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile)); frag->start_time = start_time; frag->duration = duration; frag->start_pos = start_pos; frag->size = size; frag->n = os->fragment_index; os->fragments[os->nb_fragments++] = frag; os->fragment_index++; return 0; } static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size) { AVIOContext *in, *out; int ret = 0; if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0) return ret; if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) { avio_close(in); return ret; } while (size > 0) { uint8_t buf[8192]; int n = FFMIN(size, sizeof(buf)); n = avio_read(in, buf, n); if (n <= 0) { ret = AVERROR(EIO); break; } avio_write(out, buf, n); size -= n; } avio_flush(out); avio_close(out); avio_close(in); return ret; } static int ism_flush(AVFormatContext *s, int final) { SmoothStreamingContext *c = s->priv_data; int i, ret = 0; for (i = 0; i < s->nb_streams; i++) { OutputStream *os = &c->streams[i]; char filename[1024], target_filename[1024], header_filename[1024]; int64_t start_pos = os->tail_pos, size; int64_t start_ts, duration, moof_size; if (!os->packets_written) continue; snprintf(filename, sizeof(filename), "%s/temp", os->dirname); ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL); if (ret < 0) break; os->cur_start_pos = os->tail_pos; av_write_frame(os->ctx, NULL); avio_flush(os->ctx->pb); os->packets_written = 0; if (!os->out || os->tail_out) return AVERROR(EIO); ffurl_close(os->out); os->out = NULL; size = os->tail_pos - start_pos; if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0) break; snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts); snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts); copy_moof(s, filename, header_filename, moof_size); rename(filename, target_filename); add_fragment(os, target_filename, header_filename, start_ts, duration, start_pos, size); } 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_fragments - c->window_size - c->extra_window_size - c->lookahead_count; if (final && c->remove_at_exit) remove = os->nb_fragments; if (remove > 0) { for (j = 0; j < remove; j++) { unlink(os->fragments[j]->file); unlink(os->fragments[j]->infofile); av_free(os->fragments[j]); } os->nb_fragments -= remove; memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments)); } if (final && c->remove_at_exit) rmdir(os->dirname); } } if (ret >= 0) ret = write_manifest(s, final); return ret; } static int ism_write_packet(AVFormatContext *s, AVPacket *pkt) { SmoothStreamingContext *c = s->priv_data; AVStream *st = s->streams[pkt->stream_index]; OutputStream *os = &c->streams[pkt->stream_index]; int64_t end_pts = (c->nb_fragments + 1) * c->min_frag_duration; int ret; if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) && av_compare_ts(pkt->pts, st->time_base, end_pts, AV_TIME_BASE_Q) >= 0 && pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) { if ((ret = ism_flush(s, 0)) < 0) return ret; c->nb_fragments++; } os->packets_written++; return ff_write_chained(os->ctx, 0, pkt, s); } static int ism_write_trailer(AVFormatContext *s) { SmoothStreamingContext *c = s->priv_data; ism_flush(s, 1); if (c->remove_at_exit) { char filename[1024]; snprintf(filename, sizeof(filename), "%s/Manifest", s->filename); unlink(filename); rmdir(s->filename); } ism_free(s); return 0; } #define OFFSET(x) offsetof(SmoothStreamingContext, x) #define E AV_OPT_FLAG_ENCODING_PARAM static const AVOption options[] = { { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E }, { "extra_window_size", "number of fragments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E }, { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E }, { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E }, { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E }, { NULL }, }; static const AVClass ism_class = { .class_name = "smooth streaming muxer", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; AVOutputFormat ff_smoothstreaming_muxer = { .name = "smoothstreaming", .long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"), .priv_data_size = sizeof(SmoothStreamingContext), .audio_codec = AV_CODEC_ID_AAC, .video_codec = AV_CODEC_ID_H264, .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE, .write_header = ism_write_header, .write_packet = ism_write_packet, .write_trailer = ism_write_trailer, .codec_tag = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 }, .priv_class = &ism_class, };