LCOV - code coverage report
Current view: top level - libavformat - smoothstreamingenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 393 0.0 %
Date: 2017-12-16 13:57:32 Functions: 0 13 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Live smooth streaming fragmenter
       3             :  * Copyright (c) 2012 Martin Storsjo
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "config.h"
      23             : #include <float.h>
      24             : #if HAVE_UNISTD_H
      25             : #include <unistd.h>
      26             : #endif
      27             : 
      28             : #include "avformat.h"
      29             : #include "avio_internal.h"
      30             : #include "internal.h"
      31             : #include "os_support.h"
      32             : #include "avc.h"
      33             : #include "url.h"
      34             : #include "isom.h"
      35             : 
      36             : #include "libavutil/opt.h"
      37             : #include "libavutil/avstring.h"
      38             : #include "libavutil/file.h"
      39             : #include "libavutil/mathematics.h"
      40             : #include "libavutil/intreadwrite.h"
      41             : 
      42             : typedef struct Fragment {
      43             :     char file[1024];
      44             :     char infofile[1024];
      45             :     int64_t start_time, duration;
      46             :     int n;
      47             :     int64_t start_pos, size;
      48             : } Fragment;
      49             : 
      50             : typedef struct OutputStream {
      51             :     AVFormatContext *ctx;
      52             :     int ctx_inited;
      53             :     char dirname[1024];
      54             :     uint8_t iobuf[32768];
      55             :     URLContext *out;  // Current output stream where all output is written
      56             :     URLContext *out2; // Auxiliary output stream where all output is also written
      57             :     URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
      58             :     int64_t tail_pos, cur_pos, cur_start_pos;
      59             :     int packets_written;
      60             :     const char *stream_type_tag;
      61             :     int nb_fragments, fragments_size, fragment_index;
      62             :     Fragment **fragments;
      63             : 
      64             :     const char *fourcc;
      65             :     char *private_str;
      66             :     int packet_size;
      67             :     int audio_tag;
      68             : } OutputStream;
      69             : 
      70             : typedef struct SmoothStreamingContext {
      71             :     const AVClass *class;  /* Class for private options. */
      72             :     int window_size;
      73             :     int extra_window_size;
      74             :     int lookahead_count;
      75             :     int min_frag_duration;
      76             :     int remove_at_exit;
      77             :     OutputStream *streams;
      78             :     int has_video, has_audio;
      79             :     int nb_fragments;
      80             : } SmoothStreamingContext;
      81             : 
      82           0 : static int ism_write(void *opaque, uint8_t *buf, int buf_size)
      83             : {
      84           0 :     OutputStream *os = opaque;
      85           0 :     if (os->out)
      86           0 :         ffurl_write(os->out, buf, buf_size);
      87           0 :     if (os->out2)
      88           0 :         ffurl_write(os->out2, buf, buf_size);
      89           0 :     os->cur_pos += buf_size;
      90           0 :     if (os->cur_pos >= os->tail_pos)
      91           0 :         os->tail_pos = os->cur_pos;
      92           0 :     return buf_size;
      93             : }
      94             : 
      95           0 : static int64_t ism_seek(void *opaque, int64_t offset, int whence)
      96             : {
      97           0 :     OutputStream *os = opaque;
      98             :     int i;
      99           0 :     if (whence != SEEK_SET)
     100           0 :         return AVERROR(ENOSYS);
     101           0 :     if (os->tail_out) {
     102           0 :         if (os->out) {
     103           0 :             ffurl_close(os->out);
     104             :         }
     105           0 :         if (os->out2) {
     106           0 :             ffurl_close(os->out2);
     107             :         }
     108           0 :         os->out = os->tail_out;
     109           0 :         os->out2 = NULL;
     110           0 :         os->tail_out = NULL;
     111             :     }
     112           0 :     if (offset >= os->cur_start_pos) {
     113           0 :         if (os->out)
     114           0 :             ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
     115           0 :         os->cur_pos = offset;
     116           0 :         return offset;
     117             :     }
     118           0 :     for (i = os->nb_fragments - 1; i >= 0; i--) {
     119           0 :         Fragment *frag = os->fragments[i];
     120           0 :         if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
     121             :             int ret;
     122           0 :             AVDictionary *opts = NULL;
     123           0 :             os->tail_out = os->out;
     124           0 :             av_dict_set(&opts, "truncate", "0", 0);
     125           0 :             ret = ffurl_open_whitelist(&os->out, frag->file, AVIO_FLAG_WRITE,
     126           0 :                                        &os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
     127           0 :             av_dict_free(&opts);
     128           0 :             if (ret < 0) {
     129           0 :                 os->out = os->tail_out;
     130           0 :                 os->tail_out = NULL;
     131           0 :                 return ret;
     132             :             }
     133           0 :             av_dict_set(&opts, "truncate", "0", 0);
     134           0 :             ffurl_open_whitelist(&os->out2, frag->infofile, AVIO_FLAG_WRITE,
     135           0 :                                  &os->ctx->interrupt_callback, &opts, os->ctx->protocol_whitelist, os->ctx->protocol_blacklist, NULL);
     136           0 :             av_dict_free(&opts);
     137           0 :             ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
     138           0 :             if (os->out2)
     139           0 :                 ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
     140           0 :             os->cur_pos = offset;
     141           0 :             return offset;
     142             :         }
     143             :     }
     144           0 :     return AVERROR(EIO);
     145             : }
     146             : 
     147           0 : static void get_private_data(OutputStream *os)
     148             : {
     149           0 :     AVCodecParameters *par = os->ctx->streams[0]->codecpar;
     150           0 :     uint8_t *ptr = par->extradata;
     151           0 :     int size = par->extradata_size;
     152             :     int i;
     153           0 :     if (par->codec_id == AV_CODEC_ID_H264) {
     154           0 :         ff_avc_write_annexb_extradata(ptr, &ptr, &size);
     155           0 :         if (!ptr)
     156           0 :             ptr = par->extradata;
     157             :     }
     158           0 :     if (!ptr)
     159           0 :         return;
     160           0 :     os->private_str = av_mallocz(2*size + 1);
     161           0 :     if (!os->private_str)
     162           0 :         goto fail;
     163           0 :     for (i = 0; i < size; i++)
     164           0 :         snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
     165           0 : fail:
     166           0 :     if (ptr != par->extradata)
     167           0 :         av_free(ptr);
     168             : }
     169             : 
     170           0 : static void ism_free(AVFormatContext *s)
     171             : {
     172           0 :     SmoothStreamingContext *c = s->priv_data;
     173             :     int i, j;
     174           0 :     if (!c->streams)
     175           0 :         return;
     176           0 :     for (i = 0; i < s->nb_streams; i++) {
     177           0 :         OutputStream *os = &c->streams[i];
     178           0 :         ffurl_close(os->out);
     179           0 :         ffurl_close(os->out2);
     180           0 :         ffurl_close(os->tail_out);
     181           0 :         os->out = os->out2 = os->tail_out = NULL;
     182           0 :         if (os->ctx && os->ctx_inited)
     183           0 :             av_write_trailer(os->ctx);
     184           0 :         if (os->ctx && os->ctx->pb)
     185           0 :             avio_context_free(&os->ctx->pb);
     186           0 :         if (os->ctx)
     187           0 :             avformat_free_context(os->ctx);
     188           0 :         av_freep(&os->private_str);
     189           0 :         for (j = 0; j < os->nb_fragments; j++)
     190           0 :             av_freep(&os->fragments[j]);
     191           0 :         av_freep(&os->fragments);
     192             :     }
     193           0 :     av_freep(&c->streams);
     194             : }
     195             : 
     196           0 : static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
     197             : {
     198           0 :     int removed = 0, i, start = 0;
     199           0 :     if (os->nb_fragments <= 0)
     200           0 :         return;
     201           0 :     if (os->fragments[0]->n > 0)
     202           0 :         removed = 1;
     203           0 :     if (final)
     204           0 :         skip = 0;
     205           0 :     if (window_size)
     206           0 :         start = FFMAX(os->nb_fragments - skip - window_size, 0);
     207           0 :     for (i = start; i < os->nb_fragments - skip; i++) {
     208           0 :         Fragment *frag = os->fragments[i];
     209           0 :         if (!final || removed)
     210           0 :             avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
     211             :         else
     212           0 :             avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
     213             :     }
     214             : }
     215             : 
     216           0 : static int write_manifest(AVFormatContext *s, int final)
     217             : {
     218           0 :     SmoothStreamingContext *c = s->priv_data;
     219             :     AVIOContext *out;
     220             :     char filename[1024], temp_filename[1024];
     221           0 :     int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
     222           0 :     int64_t duration = 0;
     223             : 
     224           0 :     snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
     225           0 :     snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->filename);
     226           0 :     ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);
     227           0 :     if (ret < 0) {
     228           0 :         av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename);
     229           0 :         return ret;
     230             :     }
     231           0 :     avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
     232           0 :     for (i = 0; i < s->nb_streams; i++) {
     233           0 :         OutputStream *os = &c->streams[i];
     234           0 :         if (os->nb_fragments > 0) {
     235           0 :             Fragment *last = os->fragments[os->nb_fragments - 1];
     236           0 :             duration = last->start_time + last->duration;
     237             :         }
     238           0 :         if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
     239           0 :             video_chunks = os->nb_fragments;
     240           0 :             video_streams++;
     241             :         } else {
     242           0 :             audio_chunks = os->nb_fragments;
     243           0 :             audio_streams++;
     244             :         }
     245             :     }
     246           0 :     if (!final) {
     247           0 :         duration = 0;
     248           0 :         video_chunks = audio_chunks = 0;
     249             :     }
     250           0 :     if (c->window_size) {
     251           0 :         video_chunks = FFMIN(video_chunks, c->window_size);
     252           0 :         audio_chunks = FFMIN(audio_chunks, c->window_size);
     253             :     }
     254           0 :     avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
     255           0 :     if (!final)
     256           0 :         avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
     257           0 :     avio_printf(out, ">\n");
     258           0 :     if (c->has_video) {
     259           0 :         int last = -1, index = 0;
     260           0 :         avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
     261           0 :         for (i = 0; i < s->nb_streams; i++) {
     262           0 :             OutputStream *os = &c->streams[i];
     263           0 :             if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)
     264           0 :                 continue;
     265           0 :             last = i;
     266           0 :             avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height, os->private_str);
     267           0 :             index++;
     268             :         }
     269           0 :         output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
     270           0 :         avio_printf(out, "</StreamIndex>\n");
     271             :     }
     272           0 :     if (c->has_audio) {
     273           0 :         int last = -1, index = 0;
     274           0 :         avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
     275           0 :         for (i = 0; i < s->nb_streams; i++) {
     276           0 :             OutputStream *os = &c->streams[i];
     277           0 :             if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
     278           0 :                 continue;
     279           0 :             last = i;
     280           0 :             avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%"PRId64"\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codecpar->bit_rate, os->fourcc, s->streams[i]->codecpar->sample_rate, s->streams[i]->codecpar->channels, os->packet_size, os->audio_tag, os->private_str);
     281           0 :             index++;
     282             :         }
     283           0 :         output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
     284           0 :         avio_printf(out, "</StreamIndex>\n");
     285             :     }
     286           0 :     avio_printf(out, "</SmoothStreamingMedia>\n");
     287           0 :     avio_flush(out);
     288           0 :     ff_format_io_close(s, &out);
     289           0 :     return ff_rename(temp_filename, filename, s);
     290             : }
     291             : 
     292           0 : static int ism_write_header(AVFormatContext *s)
     293             : {
     294           0 :     SmoothStreamingContext *c = s->priv_data;
     295           0 :     int ret = 0, i;
     296             :     AVOutputFormat *oformat;
     297             : 
     298           0 :     if (mkdir(s->filename, 0777) == -1 && errno != EEXIST) {
     299           0 :         ret = AVERROR(errno);
     300           0 :         av_log(s, AV_LOG_ERROR, "mkdir failed\n");
     301           0 :         goto fail;
     302             :     }
     303             : 
     304           0 :     oformat = av_guess_format("ismv", NULL, NULL);
     305           0 :     if (!oformat) {
     306           0 :         ret = AVERROR_MUXER_NOT_FOUND;
     307           0 :         goto fail;
     308             :     }
     309             : 
     310           0 :     c->streams = av_mallocz_array(s->nb_streams, sizeof(*c->streams));
     311           0 :     if (!c->streams) {
     312           0 :         ret = AVERROR(ENOMEM);
     313           0 :         goto fail;
     314             :     }
     315             : 
     316           0 :     for (i = 0; i < s->nb_streams; i++) {
     317           0 :         OutputStream *os = &c->streams[i];
     318             :         AVFormatContext *ctx;
     319             :         AVStream *st;
     320           0 :         AVDictionary *opts = NULL;
     321             : 
     322           0 :         if (!s->streams[i]->codecpar->bit_rate) {
     323           0 :             av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);
     324           0 :             ret = AVERROR(EINVAL);
     325           0 :             goto fail;
     326             :         }
     327           0 :         snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%"PRId64")", s->filename, s->streams[i]->codecpar->bit_rate);
     328           0 :         if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) {
     329           0 :             ret = AVERROR(errno);
     330           0 :             av_log(s, AV_LOG_ERROR, "mkdir failed\n");
     331           0 :             goto fail;
     332             :         }
     333             : 
     334           0 :         ctx = avformat_alloc_context();
     335           0 :         if (!ctx || ff_copy_whiteblacklists(ctx, s) < 0) {
     336           0 :             ret = AVERROR(ENOMEM);
     337           0 :             goto fail;
     338             :         }
     339           0 :         os->ctx = ctx;
     340           0 :         ctx->oformat = oformat;
     341           0 :         ctx->interrupt_callback = s->interrupt_callback;
     342             : 
     343           0 :         if (!(st = avformat_new_stream(ctx, NULL))) {
     344           0 :             ret = AVERROR(ENOMEM);
     345           0 :             goto fail;
     346             :         }
     347           0 :         avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);
     348           0 :         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
     349           0 :         st->time_base = s->streams[i]->time_base;
     350             : 
     351           0 :         ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);
     352           0 :         if (!ctx->pb) {
     353           0 :             ret = AVERROR(ENOMEM);
     354           0 :             goto fail;
     355             :         }
     356             : 
     357           0 :         av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0);
     358           0 :         av_dict_set(&opts, "movflags", "frag_custom", 0);
     359           0 :         if ((ret = avformat_write_header(ctx, &opts)) < 0) {
     360           0 :              goto fail;
     361             :         }
     362           0 :         os->ctx_inited = 1;
     363           0 :         avio_flush(ctx->pb);
     364           0 :         av_dict_free(&opts);
     365           0 :         s->streams[i]->time_base = st->time_base;
     366           0 :         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
     367           0 :             c->has_video = 1;
     368           0 :             os->stream_type_tag = "video";
     369           0 :             if (st->codecpar->codec_id == AV_CODEC_ID_H264) {
     370           0 :                 os->fourcc = "H264";
     371           0 :             } else if (st->codecpar->codec_id == AV_CODEC_ID_VC1) {
     372           0 :                 os->fourcc = "WVC1";
     373             :             } else {
     374           0 :                 av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
     375           0 :                 ret = AVERROR(EINVAL);
     376           0 :                 goto fail;
     377             :             }
     378             :         } else {
     379           0 :             c->has_audio = 1;
     380           0 :             os->stream_type_tag = "audio";
     381           0 :             if (st->codecpar->codec_id == AV_CODEC_ID_AAC) {
     382           0 :                 os->fourcc = "AACL";
     383           0 :                 os->audio_tag = 0xff;
     384           0 :             } else if (st->codecpar->codec_id == AV_CODEC_ID_WMAPRO) {
     385           0 :                 os->fourcc = "WMAP";
     386           0 :                 os->audio_tag = 0x0162;
     387             :             } else {
     388           0 :                 av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
     389           0 :                 ret = AVERROR(EINVAL);
     390           0 :                 goto fail;
     391             :             }
     392           0 :             os->packet_size = st->codecpar->block_align ? st->codecpar->block_align : 4;
     393             :         }
     394           0 :         get_private_data(os);
     395             :     }
     396             : 
     397           0 :     if (!c->has_video && c->min_frag_duration <= 0) {
     398           0 :         av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
     399           0 :         ret = AVERROR(EINVAL);
     400           0 :         goto fail;
     401             :     }
     402           0 :     ret = write_manifest(s, 0);
     403             : 
     404           0 : fail:
     405           0 :     if (ret)
     406           0 :         ism_free(s);
     407           0 :     return ret;
     408             : }
     409             : 
     410           0 : static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
     411             : {
     412             :     AVIOContext *in;
     413             :     int ret;
     414             :     uint32_t len;
     415           0 :     if ((ret = s->io_open(s, &in, filename, AVIO_FLAG_READ, NULL)) < 0)
     416           0 :         return ret;
     417           0 :     ret = AVERROR(EIO);
     418           0 :     *moof_size = avio_rb32(in);
     419           0 :     if (*moof_size < 8 || *moof_size > size)
     420             :         goto fail;
     421           0 :     if (avio_rl32(in) != MKTAG('m','o','o','f'))
     422           0 :         goto fail;
     423           0 :     len = avio_rb32(in);
     424           0 :     if (len > *moof_size)
     425           0 :         goto fail;
     426           0 :     if (avio_rl32(in) != MKTAG('m','f','h','d'))
     427           0 :         goto fail;
     428           0 :     avio_seek(in, len - 8, SEEK_CUR);
     429           0 :     avio_rb32(in); /* traf size */
     430           0 :     if (avio_rl32(in) != MKTAG('t','r','a','f'))
     431           0 :         goto fail;
     432           0 :     while (avio_tell(in) < *moof_size) {
     433           0 :         uint32_t len = avio_rb32(in);
     434           0 :         uint32_t tag = avio_rl32(in);
     435           0 :         int64_t end = avio_tell(in) + len - 8;
     436           0 :         if (len < 8 || len >= *moof_size)
     437             :             goto fail;
     438           0 :         if (tag == MKTAG('u','u','i','d')) {
     439             :             static const uint8_t tfxd[] = {
     440             :                 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
     441             :                 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
     442             :             };
     443             :             uint8_t uuid[16];
     444           0 :             avio_read(in, uuid, 16);
     445           0 :             if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {
     446           0 :                 avio_seek(in, 4, SEEK_CUR);
     447           0 :                 *start_ts = avio_rb64(in);
     448           0 :                 *duration = avio_rb64(in);
     449           0 :                 ret = 0;
     450           0 :                 break;
     451             :             }
     452             :         }
     453           0 :         avio_seek(in, end, SEEK_SET);
     454             :     }
     455           0 : fail:
     456           0 :     ff_format_io_close(s, &in);
     457           0 :     return ret;
     458             : }
     459             : 
     460           0 : 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)
     461             : {
     462             :     int err;
     463             :     Fragment *frag;
     464           0 :     if (os->nb_fragments >= os->fragments_size) {
     465           0 :         os->fragments_size = (os->fragments_size + 1) * 2;
     466           0 :         if ((err = av_reallocp(&os->fragments, sizeof(*os->fragments) *
     467           0 :                                os->fragments_size)) < 0) {
     468           0 :             os->fragments_size = 0;
     469           0 :             os->nb_fragments = 0;
     470           0 :             return err;
     471             :         }
     472             :     }
     473           0 :     frag = av_mallocz(sizeof(*frag));
     474           0 :     if (!frag)
     475           0 :         return AVERROR(ENOMEM);
     476           0 :     av_strlcpy(frag->file, file, sizeof(frag->file));
     477           0 :     av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
     478           0 :     frag->start_time = start_time;
     479           0 :     frag->duration = duration;
     480           0 :     frag->start_pos = start_pos;
     481           0 :     frag->size = size;
     482           0 :     frag->n = os->fragment_index;
     483           0 :     os->fragments[os->nb_fragments++] = frag;
     484           0 :     os->fragment_index++;
     485           0 :     return 0;
     486             : }
     487             : 
     488           0 : static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
     489             : {
     490             :     AVIOContext *in, *out;
     491           0 :     int ret = 0;
     492           0 :     if ((ret = s->io_open(s, &in, infile, AVIO_FLAG_READ, NULL)) < 0)
     493           0 :         return ret;
     494           0 :     if ((ret = s->io_open(s, &out, outfile, AVIO_FLAG_WRITE, NULL)) < 0) {
     495           0 :         ff_format_io_close(s, &in);
     496           0 :         return ret;
     497             :     }
     498           0 :     while (size > 0) {
     499             :         uint8_t buf[8192];
     500           0 :         int n = FFMIN(size, sizeof(buf));
     501           0 :         n = avio_read(in, buf, n);
     502           0 :         if (n <= 0) {
     503           0 :             ret = AVERROR(EIO);
     504           0 :             break;
     505             :         }
     506           0 :         avio_write(out, buf, n);
     507           0 :         size -= n;
     508             :     }
     509           0 :     avio_flush(out);
     510           0 :     ff_format_io_close(s, &out);
     511           0 :     ff_format_io_close(s, &in);
     512           0 :     return ret;
     513             : }
     514             : 
     515           0 : static int ism_flush(AVFormatContext *s, int final)
     516             : {
     517           0 :     SmoothStreamingContext *c = s->priv_data;
     518           0 :     int i, ret = 0;
     519             : 
     520           0 :     for (i = 0; i < s->nb_streams; i++) {
     521           0 :         OutputStream *os = &c->streams[i];
     522             :         char filename[1024], target_filename[1024], header_filename[1024];
     523             :         int64_t size;
     524             :         int64_t start_ts, duration, moof_size;
     525           0 :         if (!os->packets_written)
     526           0 :             continue;
     527             : 
     528           0 :         snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
     529           0 :         ret = ffurl_open_whitelist(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL, s->protocol_whitelist, s->protocol_blacklist, NULL);
     530           0 :         if (ret < 0)
     531           0 :             break;
     532           0 :         os->cur_start_pos = os->tail_pos;
     533           0 :         av_write_frame(os->ctx, NULL);
     534           0 :         avio_flush(os->ctx->pb);
     535           0 :         os->packets_written = 0;
     536           0 :         if (!os->out || os->tail_out)
     537           0 :             return AVERROR(EIO);
     538             : 
     539           0 :         ffurl_close(os->out);
     540           0 :         os->out = NULL;
     541           0 :         size = os->tail_pos - os->cur_start_pos;
     542           0 :         if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
     543           0 :             break;
     544           0 :         snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
     545           0 :         snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
     546           0 :         copy_moof(s, filename, header_filename, moof_size);
     547           0 :         ret = ff_rename(filename, target_filename, s);
     548           0 :         if (ret < 0)
     549           0 :             break;
     550           0 :         add_fragment(os, target_filename, header_filename, start_ts, duration,
     551             :                      os->cur_start_pos, size);
     552             :     }
     553             : 
     554           0 :     if (c->window_size || (final && c->remove_at_exit)) {
     555           0 :         for (i = 0; i < s->nb_streams; i++) {
     556           0 :             OutputStream *os = &c->streams[i];
     557             :             int j;
     558           0 :             int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
     559           0 :             if (final && c->remove_at_exit)
     560           0 :                 remove = os->nb_fragments;
     561           0 :             if (remove > 0) {
     562           0 :                 for (j = 0; j < remove; j++) {
     563           0 :                     unlink(os->fragments[j]->file);
     564           0 :                     unlink(os->fragments[j]->infofile);
     565           0 :                     av_freep(&os->fragments[j]);
     566             :                 }
     567           0 :                 os->nb_fragments -= remove;
     568           0 :                 memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
     569             :             }
     570           0 :             if (final && c->remove_at_exit)
     571           0 :                 rmdir(os->dirname);
     572             :         }
     573             :     }
     574             : 
     575           0 :     if (ret >= 0)
     576           0 :         ret = write_manifest(s, final);
     577           0 :     return ret;
     578             : }
     579             : 
     580           0 : static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)
     581             : {
     582           0 :     SmoothStreamingContext *c = s->priv_data;
     583           0 :     AVStream *st = s->streams[pkt->stream_index];
     584           0 :     OutputStream *os = &c->streams[pkt->stream_index];
     585           0 :     int64_t end_dts = (c->nb_fragments + 1) * (int64_t) c->min_frag_duration;
     586             :     int ret;
     587             : 
     588           0 :     if (st->first_dts == AV_NOPTS_VALUE)
     589           0 :         st->first_dts = pkt->dts;
     590             : 
     591           0 :     if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&
     592           0 :         av_compare_ts(pkt->dts - st->first_dts, st->time_base,
     593           0 :                       end_dts, AV_TIME_BASE_Q) >= 0 &&
     594           0 :         pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
     595             : 
     596           0 :         if ((ret = ism_flush(s, 0)) < 0)
     597           0 :             return ret;
     598           0 :         c->nb_fragments++;
     599             :     }
     600             : 
     601           0 :     os->packets_written++;
     602           0 :     return ff_write_chained(os->ctx, 0, pkt, s, 0);
     603             : }
     604             : 
     605           0 : static int ism_write_trailer(AVFormatContext *s)
     606             : {
     607           0 :     SmoothStreamingContext *c = s->priv_data;
     608           0 :     ism_flush(s, 1);
     609             : 
     610           0 :     if (c->remove_at_exit) {
     611             :         char filename[1024];
     612           0 :         snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
     613           0 :         unlink(filename);
     614           0 :         rmdir(s->filename);
     615             :     }
     616             : 
     617           0 :     ism_free(s);
     618           0 :     return 0;
     619             : }
     620             : 
     621             : #define OFFSET(x) offsetof(SmoothStreamingContext, x)
     622             : #define E AV_OPT_FLAG_ENCODING_PARAM
     623             : static const AVOption options[] = {
     624             :     { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
     625             :     { "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 },
     626             :     { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
     627             :     { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
     628             :     { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
     629             :     { NULL },
     630             : };
     631             : 
     632             : static const AVClass ism_class = {
     633             :     .class_name = "smooth streaming muxer",
     634             :     .item_name  = av_default_item_name,
     635             :     .option     = options,
     636             :     .version    = LIBAVUTIL_VERSION_INT,
     637             : };
     638             : 
     639             : 
     640             : AVOutputFormat ff_smoothstreaming_muxer = {
     641             :     .name           = "smoothstreaming",
     642             :     .long_name      = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
     643             :     .priv_data_size = sizeof(SmoothStreamingContext),
     644             :     .audio_codec    = AV_CODEC_ID_AAC,
     645             :     .video_codec    = AV_CODEC_ID_H264,
     646             :     .flags          = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
     647             :     .write_header   = ism_write_header,
     648             :     .write_packet   = ism_write_packet,
     649             :     .write_trailer  = ism_write_trailer,
     650             :     .priv_class     = &ism_class,
     651             : };

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