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FFmpeg/libavformat/smoothstreamingenc.c

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  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 "internal.h"

  30. #include "os_support.h"

  31. #include "avc.h"

  32. #include "url.h"

  33. #include "isom.h"

  34. 

  35. #include "libavutil/opt.h"

  36. #include "libavutil/avstring.h"

  37. #include "libavutil/mathematics.h"

  38. #include "libavutil/intreadwrite.h"

  39. 

  40. typedef struct {

  41.     char file[1024];

  42.     char infofile[1024];

  43.     int64_t start_time, duration;

  44.     int n;

  45.     int64_t start_pos, size;

  46. } Fragment;

  47. 

  48. typedef struct {

  49.     AVFormatContext *ctx;

  50.     int ctx_inited;

  51.     char dirname[1024];

  52.     uint8_t iobuf[32768];

  53.     URLContext *out;  // Current output stream where all output is written

  54.     URLContext *out2; // Auxiliary output stream where all output is also written

  55.     URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere

  56.     int64_t tail_pos, cur_pos, cur_start_pos;

  57.     int packets_written;

  58.     const char *stream_type_tag;

  59.     int nb_fragments, fragments_size, fragment_index;

  60.     Fragment **fragments;

  61. 

  62.     const char *fourcc;

  63.     char *private_str;

  64.     int packet_size;

  65.     int audio_tag;

  66. } OutputStream;

  67. 

  68. typedef struct {

  69.     const AVClass *class;  /* Class for private options. */

  70.     int window_size;

  71.     int extra_window_size;

  72.     int lookahead_count;

  73.     int min_frag_duration;

  74.     int remove_at_exit;

  75.     OutputStream *streams;

  76.     int has_video, has_audio;

  77.     int nb_fragments;

  78. } SmoothStreamingContext;

  79. 

  80. static int ism_write(void *opaque, uint8_t *buf, int buf_size)

  81. {

  82.     OutputStream *os = opaque;

  83.     if (os->out)

  84.         ffurl_write(os->out, buf, buf_size);

  85.     if (os->out2)

  86.         ffurl_write(os->out2, buf, buf_size);

  87.     os->cur_pos += buf_size;

  88.     if (os->cur_pos >= os->tail_pos)

  89.         os->tail_pos = os->cur_pos;

  90.     return buf_size;

  91. }

  92. 

  93. static int64_t ism_seek(void *opaque, int64_t offset, int whence)

  94. {

  95.     OutputStream *os = opaque;

  96.     int i;

  97.     if (whence != SEEK_SET)

  98.         return AVERROR(ENOSYS);

  99.     if (os->tail_out) {

  100.         if (os->out) {

  101.             ffurl_close(os->out);

  102.         }

  103.         if (os->out2) {

  104.             ffurl_close(os->out2);

  105.         }

  106.         os->out = os->tail_out;

  107.         os->out2 = NULL;

  108.         os->tail_out = NULL;

  109.     }

  110.     if (offset >= os->cur_start_pos) {

  111.         if (os->out)

  112.             ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);

  113.         os->cur_pos = offset;

  114.         return offset;

  115.     }

  116.     for (i = os->nb_fragments - 1; i >= 0; i--) {

  117.         Fragment *frag = os->fragments[i];

  118.         if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {

  119.             int ret;

  120.             AVDictionary *opts = NULL;

  121.             os->tail_out = os->out;

  122.             av_dict_set(&opts, "truncate", "0", 0);

  123.             ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);

  124.             av_dict_free(&opts);

  125.             if (ret < 0) {

  126.                 os->out = os->tail_out;

  127.                 os->tail_out = NULL;

  128.                 return ret;

  129.             }

  130.             av_dict_set(&opts, "truncate", "0", 0);

  131.             ffurl_open(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);

  132.             av_dict_free(&opts);

  133.             ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);

  134.             if (os->out2)

  135.                 ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);

  136.             os->cur_pos = offset;

  137.             return offset;

  138.         }

  139.     }

  140.     return AVERROR(EIO);

  141. }

  142. 

  143. static void get_private_data(OutputStream *os)

  144. {

  145.     AVCodecContext *codec = os->ctx->streams[0]->codec;

  146.     uint8_t *ptr = codec->extradata;

  147.     int size = codec->extradata_size;

  148.     int i;

  149.     if (codec->codec_id == AV_CODEC_ID_H264) {

  150.         ff_avc_write_annexb_extradata(ptr, &ptr, &size);

  151.         if (!ptr)

  152.             ptr = codec->extradata;

  153.     }

  154.     if (!ptr)

  155.         return;

  156.     os->private_str = av_mallocz(2*size + 1);

  157.     for (i = 0; i < size; i++)

  158.         snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);

  159.     if (ptr != codec->extradata)

  160.         av_free(ptr);

  161. }

  162. 

  163. static void ism_free(AVFormatContext *s)

  164. {

  165.     SmoothStreamingContext *c = s->priv_data;

  166.     int i, j;

  167.     if (!c->streams)

  168.         return;

  169.     for (i = 0; i < s->nb_streams; i++) {

  170.         OutputStream *os = &c->streams[i];

  171.         ffurl_close(os->out);

  172.         ffurl_close(os->out2);

  173.         ffurl_close(os->tail_out);

  174.         os->out = os->out2 = os->tail_out = NULL;

  175.         if (os->ctx && os->ctx_inited)

  176.             av_write_trailer(os->ctx);

  177.         if (os->ctx && os->ctx->pb)

  178.             av_free(os->ctx->pb);

  179.         if (os->ctx)

  180.             avformat_free_context(os->ctx);

  181.         av_free(os->private_str);

  182.         for (j = 0; j < os->nb_fragments; j++)

  183.             av_free(os->fragments[j]);

  184.         av_free(os->fragments);

  185.     }

  186.     av_freep(&c->streams);

  187. }

  188. 

  189. static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)

  190. {

  191.     int removed = 0, i, start = 0;

  192.     if (os->nb_fragments <= 0)

  193.         return;

  194.     if (os->fragments[0]->n > 0)

  195.         removed = 1;

  196.     if (final)

  197.         skip = 0;

  198.     if (window_size)

  199.         start = FFMAX(os->nb_fragments - skip - window_size, 0);

  200.     for (i = start; i < os->nb_fragments - skip; i++) {

  201.         Fragment *frag = os->fragments[i];

  202.         if (!final || removed)

  203.             avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);

  204.         else

  205.             avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);

  206.     }

  207. }

  208. 

  209. static int write_manifest(AVFormatContext *s, int final)

  210. {

  211.     SmoothStreamingContext *c = s->priv_data;

  212.     AVIOContext *out;

  213.     char filename[1024];

  214.     int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;

  215.     int64_t duration = 0;

  216. 

  217.     snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);

  218.     ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);

  219.     if (ret < 0) {

  220.         av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", filename);

  221.         return ret;

  222.     }

  223.     avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");

  224.     for (i = 0; i < s->nb_streams; i++) {

  225.         OutputStream *os = &c->streams[i];

  226.         if (os->nb_fragments > 0) {

  227.             Fragment *last = os->fragments[os->nb_fragments - 1];

  228.             duration = last->start_time + last->duration;

  229.         }

  230.         if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  231.             video_chunks = os->nb_fragments;

  232.             video_streams++;

  233.         } else {

  234.             audio_chunks = os->nb_fragments;

  235.             audio_streams++;

  236.         }

  237.     }

  238.     if (!final) {

  239.         duration = 0;

  240.         video_chunks = audio_chunks = 0;

  241.     }

  242.     if (c->window_size) {

  243.         video_chunks = FFMIN(video_chunks, c->window_size);

  244.         audio_chunks = FFMIN(audio_chunks, c->window_size);

  245.     }

  246.     avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);

  247.     if (!final)

  248.         avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);

  249.     avio_printf(out, ">\n");

  250.     if (c->has_video) {

  251.         int last = -1, index = 0;

  252.         avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);

  253.         for (i = 0; i < s->nb_streams; i++) {

  254.             OutputStream *os = &c->streams[i];

  255.             if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)

  256.                 continue;

  257.             last = i;

  258.             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);

  259.             index++;

  260.         }

  261.         output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);

  262.         avio_printf(out, "</StreamIndex>\n");

  263.     }

  264.     if (c->has_audio) {

  265.         int last = -1, index = 0;

  266.         avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);

  267.         for (i = 0; i < s->nb_streams; i++) {

  268.             OutputStream *os = &c->streams[i];

  269.             if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)

  270.                 continue;

  271.             last = i;

  272.             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);

  273.             index++;

  274.         }

  275.         output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);

  276.         avio_printf(out, "</StreamIndex>\n");

  277.     }

  278.     avio_printf(out, "</SmoothStreamingMedia>\n");

  279.     avio_flush(out);

  280.     avio_close(out);

  281.     return 0;

  282. }

  283. 

  284. static int ism_write_header(AVFormatContext *s)

  285. {

  286.     SmoothStreamingContext *c = s->priv_data;

  287.     int ret = 0, i;

  288.     AVOutputFormat *oformat;

  289. 

  290.     if (mkdir(s->filename, 0777) < 0) {

  291.         av_log(s, AV_LOG_ERROR, "mkdir failed\n");

  292.         ret = AVERROR(errno);

  293.         goto fail;

  294.     }

  295. 

  296.     oformat = av_guess_format("ismv", NULL, NULL);

  297.     if (!oformat) {

  298.         ret = AVERROR_MUXER_NOT_FOUND;

  299.         goto fail;

  300.     }

  301. 

  302.     c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);

  303.     if (!c->streams) {

  304.         ret = AVERROR(ENOMEM);

  305.         goto fail;

  306.     }

  307. 

  308.     for (i = 0; i < s->nb_streams; i++) {

  309.         OutputStream *os = &c->streams[i];

  310.         AVFormatContext *ctx;

  311.         AVStream *st;

  312.         AVDictionary *opts = NULL;

  313.         char buf[10];

  314. 

  315.         if (!s->streams[i]->codec->bit_rate) {

  316.             av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);

  317.             ret = AVERROR(EINVAL);

  318.             goto fail;

  319.         }

  320.         snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate);

  321.         if (mkdir(os->dirname, 0777) < 0) {

  322.             ret = AVERROR(errno);

  323.             av_log(s, AV_LOG_ERROR, "mkdir failed\n");

  324.             goto fail;

  325.         }

  326. 

  327.         ctx = avformat_alloc_context();

  328.         if (!ctx) {

  329.             ret = AVERROR(ENOMEM);

  330.             goto fail;

  331.         }

  332.         os->ctx = ctx;

  333.         ctx->oformat = oformat;

  334.         ctx->interrupt_callback = s->interrupt_callback;

  335. 

  336.         if (!(st = avformat_new_stream(ctx, NULL))) {

  337.             ret = AVERROR(ENOMEM);

  338.             goto fail;

  339.         }

  340.         avcodec_copy_context(st->codec, s->streams[i]->codec);

  341.         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;

  342. 

  343.         ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);

  344.         if (!ctx->pb) {

  345.             ret = AVERROR(ENOMEM);

  346.             goto fail;

  347.         }

  348. 

  349.         snprintf(buf, sizeof(buf), "%d", c->lookahead_count);

  350.         av_dict_set(&opts, "ism_lookahead", buf, 0);

  351.         av_dict_set(&opts, "movflags", "frag_custom", 0);

  352.         if ((ret = avformat_write_header(ctx, &opts)) < 0) {

  353.              goto fail;

  354.         }

  355.         os->ctx_inited = 1;

  356.         avio_flush(ctx->pb);

  357.         av_dict_free(&opts);

  358.         s->streams[i]->time_base = st->time_base;

  359.         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  360.             c->has_video = 1;

  361.             os->stream_type_tag = "video";

  362.             if (st->codec->codec_id == AV_CODEC_ID_H264) {

  363.                 os->fourcc = "H264";

  364.             } else if (st->codec->codec_id == AV_CODEC_ID_VC1) {

  365.                 os->fourcc = "WVC1";

  366.             } else {

  367.                 av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");

  368.                 ret = AVERROR(EINVAL);

  369.                 goto fail;

  370.             }

  371.         } else {

  372.             c->has_audio = 1;

  373.             os->stream_type_tag = "audio";

  374.             if (st->codec->codec_id == AV_CODEC_ID_AAC) {

  375.                 os->fourcc = "AACL";

  376.                 os->audio_tag = 0xff;

  377.             } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) {

  378.                 os->fourcc = "WMAP";

  379.                 os->audio_tag = 0x0162;

  380.             } else {

  381.                 av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");

  382.                 ret = AVERROR(EINVAL);

  383.                 goto fail;

  384.             }

  385.             os->packet_size = st->codec->block_align ? st->codec->block_align : 4;

  386.         }

  387.         get_private_data(os);

  388.     }

  389. 

  390.     if (!c->has_video && c->min_frag_duration <= 0) {

  391.         av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");

  392.         ret = AVERROR(EINVAL);

  393.     }

  394.     ret = write_manifest(s, 0);

  395. 

  396. fail:

  397.     if (ret)

  398.         ism_free(s);

  399.     return ret;

  400. }

  401. 

  402. static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)

  403. {

  404.     AVIOContext *in;

  405.     int ret;

  406.     uint32_t len;

  407.     if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)

  408.         return ret;

  409.     ret = AVERROR(EIO);

  410.     *moof_size = avio_rb32(in);

  411.     if (*moof_size < 8 || *moof_size > size)

  412.         goto fail;

  413.     if (avio_rl32(in) != MKTAG('m','o','o','f'))

  414.         goto fail;

  415.     len = avio_rb32(in);

  416.     if (len > *moof_size)

  417.         goto fail;

  418.     if (avio_rl32(in) != MKTAG('m','f','h','d'))

  419.         goto fail;

  420.     avio_seek(in, len - 8, SEEK_CUR);

  421.     avio_rb32(in); /* traf size */

  422.     if (avio_rl32(in) != MKTAG('t','r','a','f'))

  423.         goto fail;

  424.     while (avio_tell(in) < *moof_size) {

  425.         uint32_t len = avio_rb32(in);

  426.         uint32_t tag = avio_rl32(in);

  427.         int64_t end = avio_tell(in) + len - 8;

  428.         if (len < 8 || len >= *moof_size)

  429.             goto fail;

  430.         if (tag == MKTAG('u','u','i','d')) {

  431.             const uint8_t tfxd[] = {

  432.                 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,

  433.                 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2

  434.             };

  435.             uint8_t uuid[16];

  436.             avio_read(in, uuid, 16);

  437.             if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {

  438.                 avio_seek(in, 4, SEEK_CUR);

  439.                 *start_ts = avio_rb64(in);

  440.                 *duration = avio_rb64(in);

  441.                 ret = 0;

  442.                 break;

  443.             }

  444.         }

  445.         avio_seek(in, end, SEEK_SET);

  446.     }

  447. fail:

  448.     avio_close(in);

  449.     return ret;

  450. }

  451. 

  452. 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)

  453. {

  454.     Fragment *frag;

  455.     if (os->nb_fragments >= os->fragments_size) {

  456.         os->fragments_size = (os->fragments_size + 1) * 2;

  457.         os->fragments = av_realloc(os->fragments, sizeof(*os->fragments)*os->fragments_size);

  458.         if (!os->fragments)

  459.             return AVERROR(ENOMEM);

  460.     }

  461.     frag = av_mallocz(sizeof(*frag));

  462.     if (!frag)

  463.         return AVERROR(ENOMEM);

  464.     av_strlcpy(frag->file, file, sizeof(frag->file));

  465.     av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));

  466.     frag->start_time = start_time;

  467.     frag->duration = duration;

  468.     frag->start_pos = start_pos;

  469.     frag->size = size;

  470.     frag->n = os->fragment_index;

  471.     os->fragments[os->nb_fragments++] = frag;

  472.     os->fragment_index++;

  473.     return 0;

  474. }

  475. 

  476. static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)

  477. {

  478.     AVIOContext *in, *out;

  479.     int ret = 0;

  480.     if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)

  481.         return ret;

  482.     if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) {

  483.         avio_close(in);

  484.         return ret;

  485.     }

  486.     while (size > 0) {

  487.         uint8_t buf[8192];

  488.         int n = FFMIN(size, sizeof(buf));

  489.         n = avio_read(in, buf, n);

  490.         if (n <= 0) {

  491.             ret = AVERROR(EIO);

  492.             break;

  493.         }

  494.         avio_write(out, buf, n);

  495.         size -= n;

  496.     }

  497.     avio_flush(out);

  498.     avio_close(out);

  499.     avio_close(in);

  500.     return ret;

  501. }

  502. 

  503. static int ism_flush(AVFormatContext *s, int final)

  504. {

  505.     SmoothStreamingContext *c = s->priv_data;

  506.     int i, ret = 0;

  507. 

  508.     for (i = 0; i < s->nb_streams; i++) {

  509.         OutputStream *os = &c->streams[i];

  510.         char filename[1024], target_filename[1024], header_filename[1024];

  511.         int64_t start_pos = os->tail_pos, size;

  512.         int64_t start_ts, duration, moof_size;

  513.         if (!os->packets_written)

  514.             continue;

  515. 

  516.         snprintf(filename, sizeof(filename), "%s/temp", os->dirname);

  517.         ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);

  518.         if (ret < 0)

  519.             break;

  520.         os->cur_start_pos = os->tail_pos;

  521.         av_write_frame(os->ctx, NULL);

  522.         avio_flush(os->ctx->pb);

  523.         os->packets_written = 0;

  524.         if (!os->out || os->tail_out)

  525.             return AVERROR(EIO);

  526. 

  527.         ffurl_close(os->out);

  528.         os->out = NULL;

  529.         size = os->tail_pos - start_pos;

  530.         if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)

  531.             break;

  532.         snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);

  533.         snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);

  534.         copy_moof(s, filename, header_filename, moof_size);

  535.         rename(filename, target_filename);

  536.         add_fragment(os, target_filename, header_filename, start_ts, duration, start_pos, size);

  537.     }

  538. 

  539.     if (c->window_size || (final && c->remove_at_exit)) {

  540.         for (i = 0; i < s->nb_streams; i++) {

  541.             OutputStream *os = &c->streams[i];

  542.             int j;

  543.             int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;

  544.             if (final && c->remove_at_exit)

  545.                 remove = os->nb_fragments;

  546.             if (remove > 0) {

  547.                 for (j = 0; j < remove; j++) {

  548.                     unlink(os->fragments[j]->file);

  549.                     unlink(os->fragments[j]->infofile);

  550.                     av_free(os->fragments[j]);

  551.                 }

  552.                 os->nb_fragments -= remove;

  553.                 memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));

  554.             }

  555.             if (final && c->remove_at_exit)

  556.                 rmdir(os->dirname);

  557.         }

  558.     }

  559. 

  560.     if (ret >= 0)

  561.         ret = write_manifest(s, final);

  562.     return ret;

  563. }

  564. 

  565. static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)

  566. {

  567.     SmoothStreamingContext *c = s->priv_data;

  568.     AVStream *st = s->streams[pkt->stream_index];

  569.     OutputStream *os = &c->streams[pkt->stream_index];

  570.     int64_t end_dts = (c->nb_fragments + 1LL) * c->min_frag_duration;

  571.     int ret;

  572. 

  573.     if (st->first_dts == AV_NOPTS_VALUE)

  574.         st->first_dts = pkt->dts;

  575. 

  576.     if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&

  577.         av_compare_ts(pkt->dts - st->first_dts, st->time_base,

  578.                       end_dts, AV_TIME_BASE_Q) >= 0 &&

  579.         pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {

  580. 

  581.         if ((ret = ism_flush(s, 0)) < 0)

  582.             return ret;

  583.         c->nb_fragments++;

  584.     }

  585. 

  586.     os->packets_written++;

  587.     return ff_write_chained(os->ctx, 0, pkt, s);

  588. }

  589. 

  590. static int ism_write_trailer(AVFormatContext *s)

  591. {

  592.     SmoothStreamingContext *c = s->priv_data;

  593.     ism_flush(s, 1);

  594. 

  595.     if (c->remove_at_exit) {

  596.         char filename[1024];

  597.         snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);

  598.         unlink(filename);

  599.         rmdir(s->filename);

  600.     }

  601. 

  602.     ism_free(s);

  603.     return 0;

  604. }

  605. 

  606. #define OFFSET(x) offsetof(SmoothStreamingContext, x)

  607. #define E AV_OPT_FLAG_ENCODING_PARAM

  608. static const AVOption options[] = {

  609.     { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },

  610.     { "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 },

  611.     { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },

  612.     { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },

  613.     { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },

  614.     { NULL },

  615. };

  616. 

  617. static const AVClass ism_class = {

  618.     .class_name = "smooth streaming muxer",

  619.     .item_name  = av_default_item_name,

  620.     .option     = options,

  621.     .version    = LIBAVUTIL_VERSION_INT,

  622. };

  623. 

  624. 

  625. AVOutputFormat ff_smoothstreaming_muxer = {

  626.     .name           = "smoothstreaming",

  627.     .long_name      = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),

  628.     .priv_data_size = sizeof(SmoothStreamingContext),

  629.     .audio_codec    = AV_CODEC_ID_AAC,

  630.     .video_codec    = AV_CODEC_ID_H264,

  631.     .flags          = AVFMT_GLOBALHEADER | AVFMT_NOFILE,

  632.     .write_header   = ism_write_header,

  633.     .write_packet   = ism_write_packet,

  634.     .write_trailer  = ism_write_trailer,

  635.     .codec_tag      = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 },

  636.     .priv_class     = &ism_class,

  637. };