FFmpeg: libavformat/smoothstreamingenc.c Source File

00001 /*
00002  * Live smooth streaming fragmenter
00003  * Copyright (c) 2012 Martin Storsjo
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "config.h"
00023 #include <float.h>
00024 #if HAVE_UNISTD_H
00025 #include <unistd.h>
00026 #endif
00027 
00028 #include "avformat.h"
00029 #include "internal.h"
00030 #include "os_support.h"
00031 #include "avc.h"
00032 #include "url.h"
00033 #include "isom.h"
00034 
00035 #include "libavutil/opt.h"
00036 #include "libavutil/avstring.h"
00037 #include "libavutil/mathematics.h"
00038 #include "libavutil/intreadwrite.h"
00039 
00040 typedef struct {
00041     char file[1024];
00042     char infofile[1024];
00043     int64_t start_time, duration;
00044     int n;
00045     int64_t start_pos, size;
00046 } Fragment;
00047 
00048 typedef struct {
00049     AVFormatContext *ctx;
00050     int ctx_inited;
00051     char dirname[1024];
00052     uint8_t iobuf[32768];
00053     URLContext *out;  // Current output stream where all output is written
00054     URLContext *out2; // Auxillary output stream where all output also is written
00055     URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
00056     int64_t tail_pos, cur_pos, cur_start_pos;
00057     int packets_written;
00058     const char *stream_type_tag;
00059     int nb_fragments, fragments_size, fragment_index;
00060     Fragment **fragments;
00061 
00062     const char *fourcc;
00063     char *private_str;
00064     int packet_size;
00065     int audio_tag;
00066 } OutputStream;
00067 
00068 typedef struct {
00069     const AVClass *class;  /* Class for private options. */
00070     int window_size;
00071     int extra_window_size;
00072     int lookahead_count;
00073     int min_frag_duration;
00074     int remove_at_exit;
00075     OutputStream *streams;
00076     int has_video, has_audio;
00077     int nb_fragments;
00078 } SmoothStreamingContext;
00079 
00080 static int ism_write(void *opaque, uint8_t *buf, int buf_size)
00081 {
00082     OutputStream *os = opaque;
00083     if (os->out)
00084         ffurl_write(os->out, buf, buf_size);
00085     if (os->out2)
00086         ffurl_write(os->out2, buf, buf_size);
00087     os->cur_pos += buf_size;
00088     if (os->cur_pos >= os->tail_pos)
00089         os->tail_pos = os->cur_pos;
00090     return buf_size;
00091 }
00092 
00093 static int64_t ism_seek(void *opaque, int64_t offset, int whence)
00094 {
00095     OutputStream *os = opaque;
00096     int i;
00097     if (whence != SEEK_SET)
00098         return AVERROR(ENOSYS);
00099     if (os->tail_out) {
00100         if (os->out) {
00101             ffurl_close(os->out);
00102         }
00103         if (os->out2) {
00104             ffurl_close(os->out2);
00105         }
00106         os->out = os->tail_out;
00107         os->out2 = NULL;
00108         os->tail_out = NULL;
00109     }
00110     if (offset >= os->cur_start_pos) {
00111         ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
00112         os->cur_pos = offset;
00113         return offset;
00114     }
00115     for (i = os->nb_fragments - 1; i >= 0; i--) {
00116         Fragment *frag = os->fragments[i];
00117         if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
00118             int ret;
00119             AVDictionary *opts = NULL;
00120             os->tail_out = os->out;
00121             av_dict_set(&opts, "truncate", "0", 0);
00122             ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);
00123             av_dict_free(&opts);
00124             if (ret < 0) {
00125                 os->out = os->tail_out;
00126                 os->tail_out = NULL;
00127                 return ret;
00128             }
00129             av_dict_set(&opts, "truncate", "0", 0);
00130             ffurl_open(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);
00131             av_dict_free(&opts);
00132             ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
00133             if (os->out2)
00134                 ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
00135             os->cur_pos = offset;
00136             return offset;
00137         }
00138     }
00139     return AVERROR(EIO);
00140 }
00141 
00142 static void get_private_data(OutputStream *os)
00143 {
00144     AVCodecContext *codec = os->ctx->streams[0]->codec;
00145     uint8_t *ptr = codec->extradata;
00146     int size = codec->extradata_size;
00147     int i;
00148     if (codec->codec_id == AV_CODEC_ID_H264) {
00149         ff_avc_write_annexb_extradata(ptr, &ptr, &size);
00150         if (!ptr)
00151             ptr = codec->extradata;
00152     }
00153     if (!ptr)
00154         return;
00155     os->private_str = av_mallocz(2*size + 1);
00156     for (i = 0; i < size; i++)
00157         snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
00158     if (ptr != codec->extradata)
00159         av_free(ptr);
00160 }
00161 
00162 static void ism_free(AVFormatContext *s)
00163 {
00164     SmoothStreamingContext *c = s->priv_data;
00165     int i, j;
00166     if (!c->streams)
00167         return;
00168     for (i = 0; i < s->nb_streams; i++) {
00169         OutputStream *os = &c->streams[i];
00170         ffurl_close(os->out);
00171         ffurl_close(os->out2);
00172         ffurl_close(os->tail_out);
00173         os->out = os->out2 = os->tail_out = NULL;
00174         if (os->ctx && os->ctx_inited)
00175             av_write_trailer(os->ctx);
00176         if (os->ctx && os->ctx->pb)
00177             av_free(os->ctx->pb);
00178         if (os->ctx)
00179             avformat_free_context(os->ctx);
00180         av_free(os->private_str);
00181         for (j = 0; j < os->nb_fragments; j++)
00182             av_free(os->fragments[j]);
00183         av_free(os->fragments);
00184     }
00185     av_freep(&c->streams);
00186 }
00187 
00188 static int ism_write_header(AVFormatContext *s)
00189 {
00190     SmoothStreamingContext *c = s->priv_data;
00191     int ret = 0, i;
00192     AVOutputFormat *oformat;
00193 
00194     ret = mkdir(s->filename, 0777);
00195     if (ret) {
00196         av_log(s, AV_LOG_ERROR, "mkdir(%s): %s\n", s->filename, strerror(errno));
00197         return AVERROR(errno);
00198     }
00199     ret = 0;
00200 
00201     oformat = av_guess_format("ismv", NULL, NULL);
00202     if (!oformat) {
00203         ret = AVERROR_MUXER_NOT_FOUND;
00204         goto fail;
00205     }
00206 
00207     c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
00208     if (!c->streams) {
00209         ret = AVERROR(ENOMEM);
00210         goto fail;
00211     }
00212 
00213     for (i = 0; i < s->nb_streams; i++) {
00214         OutputStream *os = &c->streams[i];
00215         AVFormatContext *ctx;
00216         AVStream *st;
00217         AVDictionary *opts = NULL;
00218         char buf[10];
00219 
00220         if (!s->streams[i]->codec->bit_rate) {
00221             av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);
00222             ret = AVERROR(EINVAL);
00223             goto fail;
00224         }
00225         snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate);
00226         mkdir(os->dirname, 0777);
00227 
00228         ctx = avformat_alloc_context();
00229         if (!ctx) {
00230             ret = AVERROR(ENOMEM);
00231             goto fail;
00232         }
00233         os->ctx = ctx;
00234         ctx->oformat = oformat;
00235         ctx->interrupt_callback = s->interrupt_callback;
00236 
00237         if (!(st = avformat_new_stream(ctx, NULL))) {
00238             ret = AVERROR(ENOMEM);
00239             goto fail;
00240         }
00241         avcodec_copy_context(st->codec, s->streams[i]->codec);
00242         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
00243 
00244         ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);
00245         if (!ctx->pb) {
00246             ret = AVERROR(ENOMEM);
00247             goto fail;
00248         }
00249 
00250         snprintf(buf, sizeof(buf), "%d", c->lookahead_count);
00251         av_dict_set(&opts, "ism_lookahead", buf, 0);
00252         av_dict_set(&opts, "movflags", "frag_custom", 0);
00253         if ((ret = avformat_write_header(ctx, &opts)) < 0) {
00254              goto fail;
00255         }
00256         os->ctx_inited = 1;
00257         avio_flush(ctx->pb);
00258         av_dict_free(&opts);
00259         s->streams[i]->time_base = st->time_base;
00260         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00261             c->has_video = 1;
00262             os->stream_type_tag = "video";
00263             if (st->codec->codec_id == AV_CODEC_ID_H264) {
00264                 os->fourcc = "H264";
00265             } else if (st->codec->codec_id == AV_CODEC_ID_VC1) {
00266                 os->fourcc = "WVC1";
00267             } else {
00268                 av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
00269                 ret = AVERROR(EINVAL);
00270                 goto fail;
00271             }
00272         } else {
00273             c->has_audio = 1;
00274             os->stream_type_tag = "audio";
00275             if (st->codec->codec_id == AV_CODEC_ID_AAC) {
00276                 os->fourcc = "AACL";
00277                 os->audio_tag = 0xff;
00278             } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) {
00279                 os->fourcc = "WMAP";
00280                 os->audio_tag = 0x0162;
00281             } else {
00282                 av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
00283                 ret = AVERROR(EINVAL);
00284                 goto fail;
00285             }
00286             os->packet_size = st->codec->block_align ? st->codec->block_align : 4;
00287         }
00288         get_private_data(os);
00289     }
00290 
00291     if (!c->has_video && c->min_frag_duration <= 0) {
00292         av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
00293         ret = AVERROR(EINVAL);
00294     }
00295 
00296 fail:
00297     if (ret)
00298         ism_free(s);
00299     return ret;
00300 }
00301 
00302 static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
00303 {
00304     AVIOContext *in;
00305     int ret;
00306     uint32_t len;
00307     if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)
00308         return ret;
00309     ret = AVERROR(EIO);
00310     *moof_size = avio_rb32(in);
00311     if (*moof_size < 8 || *moof_size > size)
00312         goto fail;
00313     if (avio_rl32(in) != MKTAG('m','o','o','f'))
00314         goto fail;
00315     len = avio_rb32(in);
00316     if (len > *moof_size)
00317         goto fail;
00318     if (avio_rl32(in) != MKTAG('m','f','h','d'))
00319         goto fail;
00320     avio_seek(in, len - 8, SEEK_CUR);
00321     avio_rb32(in); /* traf size */
00322     if (avio_rl32(in) != MKTAG('t','r','a','f'))
00323         goto fail;
00324     while (avio_tell(in) < *moof_size) {
00325         uint32_t len = avio_rb32(in);
00326         uint32_t tag = avio_rl32(in);
00327         int64_t end = avio_tell(in) + len - 8;
00328         if (len < 8 || len >= *moof_size)
00329             goto fail;
00330         if (tag == MKTAG('u','u','i','d')) {
00331             const uint8_t tfxd[] = {
00332                 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
00333                 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
00334             };
00335             uint8_t uuid[16];
00336             avio_read(in, uuid, 16);
00337             if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {
00338                 avio_seek(in, 4, SEEK_CUR);
00339                 *start_ts = avio_rb64(in);
00340                 *duration = avio_rb64(in);
00341                 ret = 0;
00342                 break;
00343             }
00344         }
00345         avio_seek(in, end, SEEK_SET);
00346     }
00347 fail:
00348     avio_close(in);
00349     return ret;
00350 }
00351 
00352 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)
00353 {
00354     Fragment *frag;
00355     if (os->nb_fragments >= os->fragments_size) {
00356         os->fragments_size = (os->fragments_size + 1) * 2;
00357         os->fragments = av_realloc(os->fragments, sizeof(*os->fragments)*os->fragments_size);
00358         if (!os->fragments)
00359             return AVERROR(ENOMEM);
00360     }
00361     frag = av_mallocz(sizeof(*frag));
00362     if (!frag)
00363         return AVERROR(ENOMEM);
00364     av_strlcpy(frag->file, file, sizeof(frag->file));
00365     av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
00366     frag->start_time = start_time;
00367     frag->duration = duration;
00368     frag->start_pos = start_pos;
00369     frag->size = size;
00370     frag->n = os->fragment_index;
00371     os->fragments[os->nb_fragments++] = frag;
00372     os->fragment_index++;
00373     return 0;
00374 }
00375 
00376 static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
00377 {
00378     AVIOContext *in, *out;
00379     int ret = 0;
00380     if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)
00381         return ret;
00382     if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) {
00383         avio_close(in);
00384         return ret;
00385     }
00386     while (size > 0) {
00387         uint8_t buf[8192];
00388         int n = FFMIN(size, sizeof(buf));
00389         n = avio_read(in, buf, n);
00390         if (n <= 0) {
00391             ret = AVERROR(EIO);
00392             break;
00393         }
00394         avio_write(out, buf, n);
00395         size -= n;
00396     }
00397     avio_flush(out);
00398     avio_close(out);
00399     avio_close(in);
00400     return ret;
00401 }
00402 
00403 static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
00404 {
00405     int removed = 0, i, start = 0;
00406     if (os->nb_fragments <= 0)
00407         return;
00408     if (os->fragments[0]->n > 0)
00409         removed = 1;
00410     if (final)
00411         skip = 0;
00412     if (window_size)
00413         start = FFMAX(os->nb_fragments - skip - window_size, 0);
00414     for (i = start; i < os->nb_fragments - skip; i++) {
00415         Fragment *frag = os->fragments[i];
00416         if (!final || removed)
00417             avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
00418         else
00419             avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
00420     }
00421 }
00422 
00423 static int write_manifest(AVFormatContext *s, int final)
00424 {
00425     SmoothStreamingContext *c = s->priv_data;
00426     AVIOContext *out;
00427     char filename[1024];
00428     int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
00429     int64_t duration = 0;
00430 
00431     snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
00432     ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
00433     if (ret < 0)
00434         return ret;
00435     avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
00436     for (i = 0; i < s->nb_streams; i++) {
00437         OutputStream *os = &c->streams[i];
00438         if (os->nb_fragments > 0) {
00439             Fragment *last = os->fragments[os->nb_fragments - 1];
00440             duration = last->start_time + last->duration;
00441         }
00442         if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00443             video_chunks = os->nb_fragments;
00444             video_streams++;
00445         } else {
00446             audio_chunks = os->nb_fragments;
00447             audio_streams++;
00448         }
00449     }
00450     if (!final) {
00451         duration = 0;
00452         video_chunks = audio_chunks = 0;
00453     }
00454     if (c->window_size) {
00455         video_chunks = FFMIN(video_chunks, c->window_size);
00456         audio_chunks = FFMIN(audio_chunks, c->window_size);
00457     }
00458     avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
00459     if (!final)
00460         avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
00461     avio_printf(out, ">\n");
00462     if (c->has_video) {
00463         int last = -1, index = 0;
00464         avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
00465         for (i = 0; i < s->nb_streams; i++) {
00466             OutputStream *os = &c->streams[i];
00467             if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
00468                 continue;
00469             last = i;
00470             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);
00471             index++;
00472         }
00473         output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
00474         avio_printf(out, "</StreamIndex>\n");
00475     }
00476     if (c->has_audio) {
00477         int last = -1, index = 0;
00478         avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
00479         for (i = 0; i < s->nb_streams; i++) {
00480             OutputStream *os = &c->streams[i];
00481             if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
00482                 continue;
00483             last = i;
00484             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);
00485             index++;
00486         }
00487         output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
00488         avio_printf(out, "</StreamIndex>\n");
00489     }
00490     avio_printf(out, "</SmoothStreamingMedia>\n");
00491     avio_flush(out);
00492     avio_close(out);
00493     return 0;
00494 }
00495 
00496 static int ism_flush(AVFormatContext *s, int final)
00497 {
00498     SmoothStreamingContext *c = s->priv_data;
00499     int i, ret = 0;
00500 
00501     for (i = 0; i < s->nb_streams; i++) {
00502         OutputStream *os = &c->streams[i];
00503         char filename[1024], target_filename[1024], header_filename[1024];
00504         int64_t start_pos = os->tail_pos, size;
00505         int64_t start_ts, duration, moof_size;
00506         if (!os->packets_written)
00507             continue;
00508 
00509         snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
00510         ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
00511         if (ret < 0)
00512             break;
00513         os->cur_start_pos = os->tail_pos;
00514         av_write_frame(os->ctx, NULL);
00515         avio_flush(os->ctx->pb);
00516         os->packets_written = 0;
00517         if (!os->out || os->tail_out)
00518             return AVERROR(EIO);
00519 
00520         ffurl_close(os->out);
00521         os->out = NULL;
00522         size = os->tail_pos - start_pos;
00523         if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
00524             break;
00525         snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
00526         snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
00527         copy_moof(s, filename, header_filename, moof_size);
00528         rename(filename, target_filename);
00529         add_fragment(os, target_filename, header_filename, start_ts, duration, start_pos, size);
00530     }
00531 
00532     if (c->window_size || (final && c->remove_at_exit)) {
00533         for (i = 0; i < s->nb_streams; i++) {
00534             OutputStream *os = &c->streams[i];
00535             int j;
00536             int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
00537             if (final && c->remove_at_exit)
00538                 remove = os->nb_fragments;
00539             if (remove > 0) {
00540                 for (j = 0; j < remove; j++) {
00541                     unlink(os->fragments[j]->file);
00542                     unlink(os->fragments[j]->infofile);
00543                     av_free(os->fragments[j]);
00544                 }
00545                 os->nb_fragments -= remove;
00546                 memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
00547             }
00548             if (final && c->remove_at_exit)
00549                 rmdir(os->dirname);
00550         }
00551     }
00552 
00553     write_manifest(s, final);
00554     return ret;
00555 }
00556 
00557 static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)
00558 {
00559     SmoothStreamingContext *c = s->priv_data;
00560     AVStream *st = s->streams[pkt->stream_index];
00561     OutputStream *os = &c->streams[pkt->stream_index];
00562     int64_t end_pts = (c->nb_fragments + 1) * c->min_frag_duration;
00563 
00564     if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
00565         av_compare_ts(pkt->pts, st->time_base,
00566                       end_pts, AV_TIME_BASE_Q) >= 0 &&
00567         pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
00568 
00569         ism_flush(s, 0);
00570         c->nb_fragments++;
00571     }
00572 
00573     os->packets_written++;
00574     return ff_write_chained(os->ctx, 0, pkt, s);
00575 }
00576 
00577 static int ism_write_trailer(AVFormatContext *s)
00578 {
00579     SmoothStreamingContext *c = s->priv_data;
00580     ism_flush(s, 1);
00581 
00582     if (c->remove_at_exit) {
00583         char filename[1024];
00584         snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
00585         unlink(filename);
00586         rmdir(s->filename);
00587     }
00588 
00589     ism_free(s);
00590     return 0;
00591 }
00592 
00593 #define OFFSET(x) offsetof(SmoothStreamingContext, x)
00594 #define E AV_OPT_FLAG_ENCODING_PARAM
00595 static const AVOption options[] = {
00596     { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
00597     { "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 },
00598     { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
00599     { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
00600     { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
00601     { NULL },
00602 };
00603 
00604 static const AVClass ism_class = {
00605     .class_name = "smooth streaming muxer",
00606     .item_name  = av_default_item_name,
00607     .option     = options,
00608     .version    = LIBAVUTIL_VERSION_INT,
00609 };
00610 
00611 
00612 AVOutputFormat ff_smoothstreaming_muxer = {
00613     .name           = "smoothstreaming",
00614     .long_name      = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
00615     .priv_data_size = sizeof(SmoothStreamingContext),
00616     .audio_codec    = AV_CODEC_ID_AAC,
00617     .video_codec    = AV_CODEC_ID_H264,
00618     .flags          = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
00619     .write_header   = ism_write_header,
00620     .write_packet   = ism_write_packet,
00621     .write_trailer  = ism_write_trailer,
00622     .codec_tag      = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 },
00623     .priv_class     = &ism_class,
00624 };