| /* |
| * Live smooth streaming fragmenter |
| * Copyright (c) 2012 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" |
| #include <float.h> |
| #if HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| |
| #include "avformat.h" |
| #include "avio_internal.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/file.h" |
| #include "libavutil/mathematics.h" |
| #include "libavutil/intreadwrite.h" |
| |
| typedef struct Fragment { |
| char file[1024]; |
| char infofile[1024]; |
| int64_t start_time, duration; |
| int n; |
| int64_t start_pos, size; |
| } Fragment; |
| |
| typedef struct OutputStream { |
| AVFormatContext *ctx; |
| int ctx_inited; |
| char dirname[1024]; |
| uint8_t iobuf[32768]; |
| URLContext *out; // Current output stream where all output is written |
| URLContext *out2; // Auxiliary output stream where all output is also 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 SmoothStreamingContext { |
| 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_whitelist(&os->out, frag->file, AVIO_FLAG_READ_WRITE, |
| &os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist); |
| 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_whitelist(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, |
| &os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist); |
| 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); |
| if (!os->private_str) |
| goto fail; |
| for (i = 0; i < size; i++) |
| snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]); |
| fail: |
| 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_freep(&os->ctx->pb); |
| if (os->ctx) |
| avformat_free_context(os->ctx); |
| av_freep(&os->private_str); |
| for (j = 0; j < os->nb_fragments; j++) |
| av_freep(&os->fragments[j]); |
| av_freep(&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], temp_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); |
| snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->filename); |
| ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, 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"); |
| 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=\"%"PRId64"\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, (int64_t)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=\"%"PRId64"\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n", index, (int64_t)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); |
| ff_format_io_close(s, &out); |
| return ff_rename(temp_filename, filename, s); |
| } |
| |
| static int ism_write_header(AVFormatContext *s) |
| { |
| SmoothStreamingContext *c = s->priv_data; |
| int ret = 0, i; |
| AVOutputFormat *oformat; |
| |
| if (mkdir(s->filename, 0777) == -1 && errno != EEXIST) { |
| ret = AVERROR(errno); |
| av_log(s, AV_LOG_ERROR, "mkdir failed\n"); |
| goto fail; |
| } |
| |
| oformat = av_guess_format("ismv", NULL, NULL); |
| if (!oformat) { |
| ret = AVERROR_MUXER_NOT_FOUND; |
| goto fail; |
| } |
| |
| c->streams = av_mallocz_array(s->nb_streams, sizeof(*c->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; |
| |
| 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(%"PRId64")", s->filename, (int64_t)s->streams[i]->codec->bit_rate); |
| if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) { |
| ret = AVERROR(errno); |
| av_log(s, AV_LOG_ERROR, "mkdir failed\n"); |
| goto fail; |
| } |
| |
| ctx = avformat_alloc_context(); |
| if (!ctx || ff_copy_whitelists(ctx, s) < 0) { |
| 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->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; |
| } |
| |
| av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 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); |
| goto fail; |
| } |
| 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 = s->io_open(s, &in, filename, AVIO_FLAG_READ, 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')) { |
| static 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: |
| ff_format_io_close(s, &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) |
| { |
| int err; |
| Fragment *frag; |
| if (os->nb_fragments >= os->fragments_size) { |
| os->fragments_size = (os->fragments_size + 1) * 2; |
| if ((err = av_reallocp(&os->fragments, sizeof(*os->fragments) * |
| os->fragments_size)) < 0) { |
| os->fragments_size = 0; |
| os->nb_fragments = 0; |
| return err; |
| } |
| } |
| 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 = s->io_open(s, &in, infile, AVIO_FLAG_READ, NULL)) < 0) |
| return ret; |
| if ((ret = s->io_open(s, &out, outfile, AVIO_FLAG_WRITE, NULL)) < 0) { |
| ff_format_io_close(s, &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); |
| ff_format_io_close(s, &out); |
| ff_format_io_close(s, &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 size; |
| int64_t start_ts, duration, moof_size; |
| if (!os->packets_written) |
| continue; |
| |
| snprintf(filename, sizeof(filename), "%s/temp", os->dirname); |
| ret = ffurl_open_whitelist(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL, s->protocol_whitelist); |
| 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 - os->cur_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); |
| ret = ff_rename(filename, target_filename, s); |
| if (ret < 0) |
| break; |
| add_fragment(os, target_filename, header_filename, start_ts, duration, |
| os->cur_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_freep(&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_dts = (c->nb_fragments + 1) * (int64_t) c->min_frag_duration; |
| int ret; |
| |
| if (st->first_dts == AV_NOPTS_VALUE) |
| st->first_dts = pkt->dts; |
| |
| if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) && |
| av_compare_ts(pkt->dts - st->first_dts, st->time_base, |
| end_dts, 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, 0); |
| } |
| |
| 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_BOOL, { .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, |
| }; |
