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FFmpeg/libavformat/dashenc.c

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  1. /*

  2.  * MPEG-DASH ISO BMFF segmenter

  3.  * Copyright (c) 2014 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. #if HAVE_UNISTD_H

  24. #include <unistd.h>

  25. #endif

  26. 

  27. #include "libavutil/avassert.h"

  28. #include "libavutil/avstring.h"

  29. #include "libavutil/intreadwrite.h"

  30. #include "libavutil/mathematics.h"

  31. #include "libavutil/opt.h"

  32. #include "libavutil/rational.h"

  33. #include "libavutil/time_internal.h"

  34. 

  35. #include "avc.h"

  36. #include "avformat.h"

  37. #include "avio_internal.h"

  38. #include "internal.h"

  39. #include "isom.h"

  40. #include "os_support.h"

  41. #include "url.h"

  42. #include "dash.h"

  43. 

  44. typedef struct Segment {

  45.     char file[1024];

  46.     int64_t start_pos;

  47.     int range_length, index_length;

  48.     int64_t time;

  49.     int duration;

  50.     int n;

  51. } Segment;

  52. 

  53. typedef struct OutputStream {

  54.     AVFormatContext *ctx;

  55.     int ctx_inited;

  56.     uint8_t iobuf[32768];

  57.     AVIOContext *out;

  58.     int packets_written;

  59.     char initfile[1024];

  60.     int64_t init_start_pos;

  61.     int init_range_length;

  62.     int nb_segments, segments_size, segment_index;

  63.     Segment **segments;

  64.     int64_t first_pts, start_pts, max_pts;

  65.     int64_t last_dts;

  66.     int bit_rate;

  67.     char bandwidth_str[64];

  68. 

  69.     char codec_str[100];

  70. } OutputStream;

  71. 

  72. typedef struct DASHContext {

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

  74.     int window_size;

  75.     int extra_window_size;

  76.     int min_seg_duration;

  77.     int remove_at_exit;

  78.     int use_template;

  79.     int use_timeline;

  80.     int single_file;

  81.     OutputStream *streams;

  82.     int has_video, has_audio;

  83.     int64_t last_duration;

  84.     int64_t total_duration;

  85.     char availability_start_time[100];

  86.     char dirname[1024];

  87.     const char *single_file_name;

  88.     const char *init_seg_name;

  89.     const char *media_seg_name;

  90.     AVRational min_frame_rate, max_frame_rate;

  91.     int ambiguous_frame_rate;

  92.     const char *utc_timing_url;

  93. } DASHContext;

  94. 

  95. static int dash_write(void *opaque, uint8_t *buf, int buf_size)

  96. {

  97.     OutputStream *os = opaque;

  98.     if (os->out)

  99.         avio_write(os->out, buf, buf_size);

  100.     return buf_size;

  101. }

  102. 

  103. // RFC 6381

  104. static void set_codec_str(AVFormatContext *s, AVCodecParameters *par,

  105.                           char *str, int size)

  106. {

  107.     const AVCodecTag *tags[2] = { NULL, NULL };

  108.     uint32_t tag;

  109.     if (par->codec_type == AVMEDIA_TYPE_VIDEO)

  110.         tags[0] = ff_codec_movvideo_tags;

  111.     else if (par->codec_type == AVMEDIA_TYPE_AUDIO)

  112.         tags[0] = ff_codec_movaudio_tags;

  113.     else

  114.         return;

  115. 

  116.     tag = av_codec_get_tag(tags, par->codec_id);

  117.     if (!tag)

  118.         return;

  119.     if (size < 5)

  120.         return;

  121. 

  122.     AV_WL32(str, tag);

  123.     str[4] = '\0';

  124.     if (!strcmp(str, "mp4a") || !strcmp(str, "mp4v")) {

  125.         uint32_t oti;

  126.         tags[0] = ff_mp4_obj_type;

  127.         oti = av_codec_get_tag(tags, par->codec_id);

  128.         if (oti)

  129.             av_strlcatf(str, size, ".%02"PRIx32, oti);

  130.         else

  131.             return;

  132. 

  133.         if (tag == MKTAG('m', 'p', '4', 'a')) {

  134.             if (par->extradata_size >= 2) {

  135.                 int aot = par->extradata[0] >> 3;

  136.                 if (aot == 31)

  137.                     aot = ((AV_RB16(par->extradata) >> 5) & 0x3f) + 32;

  138.                 av_strlcatf(str, size, ".%d", aot);

  139.             }

  140.         } else if (tag == MKTAG('m', 'p', '4', 'v')) {

  141.             // Unimplemented, should output ProfileLevelIndication as a decimal number

  142.             av_log(s, AV_LOG_WARNING, "Incomplete RFC 6381 codec string for mp4v\n");

  143.         }

  144.     } else if (!strcmp(str, "avc1")) {

  145.         uint8_t *tmpbuf = NULL;

  146.         uint8_t *extradata = par->extradata;

  147.         int extradata_size = par->extradata_size;

  148.         if (!extradata_size)

  149.             return;

  150.         if (extradata[0] != 1) {

  151.             AVIOContext *pb;

  152.             if (avio_open_dyn_buf(&pb) < 0)

  153.                 return;

  154.             if (ff_isom_write_avcc(pb, extradata, extradata_size) < 0) {

  155.                 ffio_free_dyn_buf(&pb);

  156.                 return;

  157.             }

  158.             extradata_size = avio_close_dyn_buf(pb, &extradata);

  159.             tmpbuf = extradata;

  160.         }

  161. 

  162.         if (extradata_size >= 4)

  163.             av_strlcatf(str, size, ".%02x%02x%02x",

  164.                         extradata[1], extradata[2], extradata[3]);

  165.         av_free(tmpbuf);

  166.     }

  167. }

  168. 

  169. static void dash_free(AVFormatContext *s)

  170. {

  171.     DASHContext *c = s->priv_data;

  172.     int i, j;

  173.     if (!c->streams)

  174.         return;

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

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

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

  178.             av_write_trailer(os->ctx);

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

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

  181.         ff_format_io_close(s, &os->out);

  182.         if (os->ctx)

  183.             avformat_free_context(os->ctx);

  184.         for (j = 0; j < os->nb_segments; j++)

  185.             av_free(os->segments[j]);

  186.         av_free(os->segments);

  187.     }

  188.     av_freep(&c->streams);

  189. }

  190. 

  191. static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext *c)

  192. {

  193.     int i, start_index = 0, start_number = 1;

  194.     if (c->window_size) {

  195.         start_index  = FFMAX(os->nb_segments   - c->window_size, 0);

  196.         start_number = FFMAX(os->segment_index - c->window_size, 1);

  197.     }

  198. 

  199.     if (c->use_template) {

  200.         int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;

  201.         avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);

  202.         if (!c->use_timeline)

  203.             avio_printf(out, "duration=\"%"PRId64"\" ", c->last_duration);

  204.         avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);

  205.         if (c->use_timeline) {

  206.             int64_t cur_time = 0;

  207.             avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");

  208.             for (i = start_index; i < os->nb_segments; ) {

  209.                 Segment *seg = os->segments[i];

  210.                 int repeat = 0;

  211.                 avio_printf(out, "\t\t\t\t\t\t<S ");

  212.                 if (i == start_index || seg->time != cur_time) {

  213.                     cur_time = seg->time;

  214.                     avio_printf(out, "t=\"%"PRId64"\" ", seg->time);

  215.                 }

  216.                 avio_printf(out, "d=\"%d\" ", seg->duration);

  217.                 while (i + repeat + 1 < os->nb_segments &&

  218.                        os->segments[i + repeat + 1]->duration == seg->duration &&

  219.                        os->segments[i + repeat + 1]->time == os->segments[i + repeat]->time + os->segments[i + repeat]->duration)

  220.                     repeat++;

  221.                 if (repeat > 0)

  222.                     avio_printf(out, "r=\"%d\" ", repeat);

  223.                 avio_printf(out, "/>\n");

  224.                 i += 1 + repeat;

  225.                 cur_time += (1 + repeat) * seg->duration;

  226.             }

  227.             avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");

  228.         }

  229.         avio_printf(out, "\t\t\t\t</SegmentTemplate>\n");

  230.     } else if (c->single_file) {

  231.         avio_printf(out, "\t\t\t\t<BaseURL>%s</BaseURL>\n", os->initfile);

  232.         avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);

  233.         avio_printf(out, "\t\t\t\t\t<Initialization range=\"%"PRId64"-%"PRId64"\" />\n", os->init_start_pos, os->init_start_pos + os->init_range_length - 1);

  234.         for (i = start_index; i < os->nb_segments; i++) {

  235.             Segment *seg = os->segments[i];

  236.             avio_printf(out, "\t\t\t\t\t<SegmentURL mediaRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->range_length - 1);

  237.             if (seg->index_length)

  238.                 avio_printf(out, "indexRange=\"%"PRId64"-%"PRId64"\" ", seg->start_pos, seg->start_pos + seg->index_length - 1);

  239.             avio_printf(out, "/>\n");

  240.         }

  241.         avio_printf(out, "\t\t\t\t</SegmentList>\n");

  242.     } else {

  243.         avio_printf(out, "\t\t\t\t<SegmentList timescale=\"%d\" duration=\"%"PRId64"\" startNumber=\"%d\">\n", AV_TIME_BASE, c->last_duration, start_number);

  244.         avio_printf(out, "\t\t\t\t\t<Initialization sourceURL=\"%s\" />\n", os->initfile);

  245.         for (i = start_index; i < os->nb_segments; i++) {

  246.             Segment *seg = os->segments[i];

  247.             avio_printf(out, "\t\t\t\t\t<SegmentURL media=\"%s\" />\n", seg->file);

  248.         }

  249.         avio_printf(out, "\t\t\t\t</SegmentList>\n");

  250.     }

  251. }

  252. 

  253. static char *xmlescape(const char *str) {

  254.     int outlen = strlen(str)*3/2 + 6;

  255.     char *out = av_realloc(NULL, outlen + 1);

  256.     int pos = 0;

  257.     if (!out)

  258.         return NULL;

  259.     for (; *str; str++) {

  260.         if (pos + 6 > outlen) {

  261.             char *tmp;

  262.             outlen = 2 * outlen + 6;

  263.             tmp = av_realloc(out, outlen + 1);

  264.             if (!tmp) {

  265.                 av_free(out);

  266.                 return NULL;

  267.             }

  268.             out = tmp;

  269.         }

  270.         if (*str == '&') {

  271.             memcpy(&out[pos], "&amp;", 5);

  272.             pos += 5;

  273.         } else if (*str == '<') {

  274.             memcpy(&out[pos], "&lt;", 4);

  275.             pos += 4;

  276.         } else if (*str == '>') {

  277.             memcpy(&out[pos], "&gt;", 4);

  278.             pos += 4;

  279.         } else if (*str == '\'') {

  280.             memcpy(&out[pos], "&apos;", 6);

  281.             pos += 6;

  282.         } else if (*str == '\"') {

  283.             memcpy(&out[pos], "&quot;", 6);

  284.             pos += 6;

  285.         } else {

  286.             out[pos++] = *str;

  287.         }

  288.     }

  289.     out[pos] = '\0';

  290.     return out;

  291. }

  292. 

  293. static void write_time(AVIOContext *out, int64_t time)

  294. {

  295.     int seconds = time / AV_TIME_BASE;

  296.     int fractions = time % AV_TIME_BASE;

  297.     int minutes = seconds / 60;

  298.     int hours = minutes / 60;

  299.     seconds %= 60;

  300.     minutes %= 60;

  301.     avio_printf(out, "PT");

  302.     if (hours)

  303.         avio_printf(out, "%dH", hours);

  304.     if (hours || minutes)

  305.         avio_printf(out, "%dM", minutes);

  306.     avio_printf(out, "%d.%dS", seconds, fractions / (AV_TIME_BASE / 10));

  307. }

  308. 

  309. static void format_date_now(char *buf, int size)

  310. {

  311.     time_t t = time(NULL);

  312.     struct tm *ptm, tmbuf;

  313.     ptm = gmtime_r(&t, &tmbuf);

  314.     if (ptm) {

  315.         if (!strftime(buf, size, "%Y-%m-%dT%H:%M:%SZ", ptm))

  316.             buf[0] = '\0';

  317.     }

  318. }

  319. 

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

  321. {

  322.     DASHContext *c = s->priv_data;

  323.     AVIOContext *out;

  324.     char temp_filename[1024];

  325.     int ret, i, as_id = 0;

  326.     const char *proto = avio_find_protocol_name(s->filename);

  327.     int use_rename = proto && !strcmp(proto, "file");

  328.     static unsigned int warned_non_file = 0;

  329.     AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);

  330. 

  331.     if (!use_rename && !warned_non_file++)

  332.         av_log(s, AV_LOG_ERROR, "Cannot use rename on non file protocol, this may lead to races and temporary partial files\n");

  333. 

  334.     snprintf(temp_filename, sizeof(temp_filename), use_rename ? "%s.tmp" : "%s", s->filename);

  335.     ret = s->io_open(s, &out, temp_filename, AVIO_FLAG_WRITE, NULL);

  336.     if (ret < 0) {

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

  338.         return ret;

  339.     }

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

  341.     avio_printf(out, "<MPD xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n"

  342.                 "\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"

  343.                 "\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"

  344.                 "\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"

  345.                 "\tprofiles=\"urn:mpeg:dash:profile:isoff-live:2011\"\n"

  346.                 "\ttype=\"%s\"\n", final ? "static" : "dynamic");

  347.     if (final) {

  348.         avio_printf(out, "\tmediaPresentationDuration=\"");

  349.         write_time(out, c->total_duration);

  350.         avio_printf(out, "\"\n");

  351.     } else {

  352.         int64_t update_period = c->last_duration / AV_TIME_BASE;

  353.         char now_str[100];

  354.         if (c->use_template && !c->use_timeline)

  355.             update_period = 500;

  356.         avio_printf(out, "\tminimumUpdatePeriod=\"PT%"PRId64"S\"\n", update_period);

  357.         avio_printf(out, "\tsuggestedPresentationDelay=\"PT%"PRId64"S\"\n", c->last_duration / AV_TIME_BASE);

  358.         if (!c->availability_start_time[0] && s->nb_streams > 0 && c->streams[0].nb_segments > 0) {

  359.             format_date_now(c->availability_start_time, sizeof(c->availability_start_time));

  360.         }

  361.         if (c->availability_start_time[0])

  362.             avio_printf(out, "\tavailabilityStartTime=\"%s\"\n", c->availability_start_time);

  363.         format_date_now(now_str, sizeof(now_str));

  364.         if (now_str[0])

  365.             avio_printf(out, "\tpublishTime=\"%s\"\n", now_str);

  366.         if (c->window_size && c->use_template) {

  367.             avio_printf(out, "\ttimeShiftBufferDepth=\"");

  368.             write_time(out, c->last_duration * c->window_size);

  369.             avio_printf(out, "\"\n");

  370.         }

  371.     }

  372.     avio_printf(out, "\tminBufferTime=\"");

  373.     write_time(out, c->last_duration * 2);

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

  375.     avio_printf(out, "\t<ProgramInformation>\n");

  376.     if (title) {

  377.         char *escaped = xmlescape(title->value);

  378.         avio_printf(out, "\t\t<Title>%s</Title>\n", escaped);

  379.         av_free(escaped);

  380.     }

  381.     avio_printf(out, "\t</ProgramInformation>\n");

  382.     if (c->utc_timing_url)

  383.         avio_printf(out, "\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);

  384. 

  385.     if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {

  386.         OutputStream *os = &c->streams[0];

  387.         int start_index = FFMAX(os->nb_segments - c->window_size, 0);

  388.         int64_t start_time = av_rescale_q(os->segments[start_index]->time, s->streams[0]->time_base, AV_TIME_BASE_Q);

  389.         avio_printf(out, "\t<Period id=\"0\" start=\"");

  390.         write_time(out, start_time);

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

  392.     } else {

  393.         avio_printf(out, "\t<Period id=\"0\" start=\"PT0.0S\">\n");

  394.     }

  395. 

  396.     if (c->has_video) {

  397.         avio_printf(out, "\t\t<AdaptationSet id=\"%d\" contentType=\"video\" segmentAlignment=\"true\" bitstreamSwitching=\"true\"", as_id++);

  398.         if (c->max_frame_rate.num && !c->ambiguous_frame_rate)

  399.             avio_printf(out, " %s=\"%d/%d\"", (av_cmp_q(c->min_frame_rate, c->max_frame_rate) < 0) ? "maxFrameRate" : "frameRate", c->max_frame_rate.num, c->max_frame_rate.den);

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

  401. 

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

  403.             AVStream *st = s->streams[i];

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

  405. 

  406.             if (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO)

  407.                 continue;

  408. 

  409.             avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/mp4\" codecs=\"%s\"%s width=\"%d\" height=\"%d\"", i, os->codec_str, os->bandwidth_str, st->codecpar->width, st->codecpar->height);

  410.             if (st->avg_frame_rate.num)

  411.                 avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den);

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

  413. 

  414.             output_segment_list(&c->streams[i], out, c);

  415.             avio_printf(out, "\t\t\t</Representation>\n");

  416.         }

  417.         avio_printf(out, "\t\t</AdaptationSet>\n");

  418.     }

  419.     if (c->has_audio) {

  420.         avio_printf(out, "\t\t<AdaptationSet id=\"%d\" contentType=\"audio\" segmentAlignment=\"true\" bitstreamSwitching=\"true\">\n", as_id++);

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

  422.             AVStream *st = s->streams[i];

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

  424. 

  425.             if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)

  426.                 continue;

  427. 

  428.             avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"audio/mp4\" codecs=\"%s\"%s audioSamplingRate=\"%d\">\n", i, os->codec_str, os->bandwidth_str, st->codecpar->sample_rate);

  429.             avio_printf(out, "\t\t\t\t<AudioChannelConfiguration schemeIdUri=\"urn:mpeg:dash:23003:3:audio_channel_configuration:2011\" value=\"%d\" />\n", st->codecpar->channels);

  430.             output_segment_list(&c->streams[i], out, c);

  431.             avio_printf(out, "\t\t\t</Representation>\n");

  432.         }

  433.         avio_printf(out, "\t\t</AdaptationSet>\n");

  434.     }

  435.     avio_printf(out, "\t</Period>\n");

  436.     avio_printf(out, "</MPD>\n");

  437.     avio_flush(out);

  438.     ff_format_io_close(s, &out);

  439. 

  440.     if (use_rename)

  441.         return avpriv_io_move(temp_filename, s->filename);

  442. 

  443.     return 0;

  444. }

  445. 

  446. static int dash_init(AVFormatContext *s)

  447. {

  448.     DASHContext *c = s->priv_data;

  449.     int ret = 0, i;

  450.     AVOutputFormat *oformat;

  451.     char *ptr;

  452.     char basename[1024];

  453. 

  454.     if (c->single_file_name)

  455.         c->single_file = 1;

  456.     if (c->single_file)

  457.         c->use_template = 0;

  458.     c->ambiguous_frame_rate = 0;

  459. 

  460.     av_strlcpy(c->dirname, s->filename, sizeof(c->dirname));

  461.     ptr = strrchr(c->dirname, '/');

  462.     if (ptr) {

  463.         av_strlcpy(basename, &ptr[1], sizeof(basename));

  464.         ptr[1] = '\0';

  465.     } else {

  466.         c->dirname[0] = '\0';

  467.         av_strlcpy(basename, s->filename, sizeof(basename));

  468.     }

  469. 

  470.     ptr = strrchr(basename, '.');

  471.     if (ptr)

  472.         *ptr = '\0';

  473. 

  474.     oformat = av_guess_format("mp4", NULL, NULL);

  475.     if (!oformat)

  476.         return AVERROR_MUXER_NOT_FOUND;

  477. 

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

  479.     if (!c->streams)

  480.         return AVERROR(ENOMEM);

  481. 

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

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

  484.         AVFormatContext *ctx;

  485.         AVStream *st;

  486.         AVDictionary *opts = NULL;

  487.         char filename[1024];

  488. 

  489.         os->bit_rate = s->streams[i]->codecpar->bit_rate;

  490.         if (os->bit_rate) {

  491.             snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),

  492.                      " bandwidth=\"%d\"", os->bit_rate);

  493.         } else {

  494.             int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?

  495.                         AV_LOG_ERROR : AV_LOG_WARNING;

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

  497.             if (s->strict_std_compliance >= FF_COMPLIANCE_STRICT)

  498.                 return AVERROR(EINVAL);

  499.         }

  500. 

  501.         ctx = avformat_alloc_context();

  502.         if (!ctx)

  503.             return AVERROR(ENOMEM);

  504.         os->ctx = ctx;

  505.         ctx->oformat = oformat;

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

  507.         ctx->opaque             = s->opaque;

  508.         ctx->io_close           = s->io_close;

  509.         ctx->io_open            = s->io_open;

  510. 

  511.         if (!(st = avformat_new_stream(ctx, NULL)))

  512.             return AVERROR(ENOMEM);

  513.         avcodec_parameters_copy(st->codecpar, s->streams[i]->codecpar);

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

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

  516.         ctx->avoid_negative_ts = s->avoid_negative_ts;

  517.         ctx->flags = s->flags;

  518. 

  519.         ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, dash_write, NULL);

  520.         if (!ctx->pb)

  521.             return AVERROR(ENOMEM);

  522. 

  523.         if (c->single_file) {

  524.             if (c->single_file_name)

  525.                 ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->single_file_name, i, 0, os->bit_rate, 0);

  526.             else

  527.                 snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);

  528.         } else {

  529.             ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->init_seg_name, i, 0, os->bit_rate, 0);

  530.         }

  531.         snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);

  532.         ret = s->io_open(s, &os->out, filename, AVIO_FLAG_WRITE, NULL);

  533.         if (ret < 0)

  534.             return ret;

  535.         os->init_start_pos = 0;

  536. 

  537.         av_dict_set(&opts, "movflags", "frag_custom+dash+delay_moov", 0);

  538.         if ((ret = avformat_init_output(ctx, &opts)) < 0)

  539.             return ret;

  540.         os->ctx_inited = 1;

  541.         avio_flush(ctx->pb);

  542.         av_dict_free(&opts);

  543. 

  544.         av_log(s, AV_LOG_VERBOSE, "Representation %d init segment will be written to: %s\n", i, filename);

  545. 

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

  547.         // If the muxer wants to shift timestamps, request to have them shifted

  548.         // already before being handed to this muxer, so we don't have mismatches

  549.         // between the MPD and the actual segments.

  550.         s->avoid_negative_ts = ctx->avoid_negative_ts;

  551.         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {

  552.             AVRational avg_frame_rate = s->streams[i]->avg_frame_rate;

  553.             if (avg_frame_rate.num > 0) {

  554.                 if (av_cmp_q(avg_frame_rate, c->min_frame_rate) < 0)

  555.                     c->min_frame_rate = avg_frame_rate;

  556.                 if (av_cmp_q(c->max_frame_rate, avg_frame_rate) < 0)

  557.                     c->max_frame_rate = avg_frame_rate;

  558.             } else {

  559.                 c->ambiguous_frame_rate = 1;

  560.             }

  561.             c->has_video = 1;

  562.         } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {

  563.             c->has_audio = 1;

  564.         }

  565. 

  566.         set_codec_str(s, st->codecpar, os->codec_str, sizeof(os->codec_str));

  567.         os->first_pts = AV_NOPTS_VALUE;

  568.         os->max_pts = AV_NOPTS_VALUE;

  569.         os->last_dts = AV_NOPTS_VALUE;

  570.         os->segment_index = 1;

  571.     }

  572. 

  573.     if (!c->has_video && c->min_seg_duration <= 0) {

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

  575.         return AVERROR(EINVAL);

  576.     }

  577.     return 0;

  578. }

  579. 

  580. static int dash_write_header(AVFormatContext *s)

  581. {

  582.     DASHContext *c = s->priv_data;

  583.     int i, ret;

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

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

  586.         if ((ret = avformat_write_header(os->ctx, NULL)) < 0) {

  587.             dash_free(s);

  588.             return ret;

  589.         }

  590.     }

  591.     ret = write_manifest(s, 0);

  592.     if (!ret)

  593.         av_log(s, AV_LOG_VERBOSE, "Manifest written to: %s\n", s->filename);

  594.     return ret;

  595. }

  596. 

  597. static int add_segment(OutputStream *os, const char *file,

  598.                        int64_t time, int duration,

  599.                        int64_t start_pos, int64_t range_length,

  600.                        int64_t index_length)

  601. {

  602.     int err;

  603.     Segment *seg;

  604.     if (os->nb_segments >= os->segments_size) {

  605.         os->segments_size = (os->segments_size + 1) * 2;

  606.         if ((err = av_reallocp(&os->segments, sizeof(*os->segments) *

  607.                                os->segments_size)) < 0) {

  608.             os->segments_size = 0;

  609.             os->nb_segments = 0;

  610.             return err;

  611.         }

  612.     }

  613.     seg = av_mallocz(sizeof(*seg));

  614.     if (!seg)

  615.         return AVERROR(ENOMEM);

  616.     av_strlcpy(seg->file, file, sizeof(seg->file));

  617.     seg->time = time;

  618.     seg->duration = duration;

  619.     if (seg->time < 0) { // If pts<0, it is expected to be cut away with an edit list

  620.         seg->duration += seg->time;

  621.         seg->time = 0;

  622.     }

  623.     seg->start_pos = start_pos;

  624.     seg->range_length = range_length;

  625.     seg->index_length = index_length;

  626.     os->segments[os->nb_segments++] = seg;

  627.     os->segment_index++;

  628.     return 0;

  629. }

  630. 

  631. static void write_styp(AVIOContext *pb)

  632. {

  633.     avio_wb32(pb, 24);

  634.     ffio_wfourcc(pb, "styp");

  635.     ffio_wfourcc(pb, "msdh");

  636.     avio_wb32(pb, 0); /* minor */

  637.     ffio_wfourcc(pb, "msdh");

  638.     ffio_wfourcc(pb, "msix");

  639. }

  640. 

  641. static void find_index_range(AVFormatContext *s, const char *full_path,

  642.                              int64_t pos, int *index_length)

  643. {

  644.     uint8_t buf[8];

  645.     AVIOContext *pb;

  646.     int ret;

  647. 

  648.     ret = s->io_open(s, &pb, full_path, AVIO_FLAG_READ, NULL);

  649.     if (ret < 0)

  650.         return;

  651.     if (avio_seek(pb, pos, SEEK_SET) != pos) {

  652.         ff_format_io_close(s, &pb);

  653.         return;

  654.     }

  655.     ret = avio_read(pb, buf, 8);

  656.     ff_format_io_close(s, &pb);

  657.     if (ret < 8)

  658.         return;

  659.     if (AV_RL32(&buf[4]) != MKTAG('s', 'i', 'd', 'x'))

  660.         return;

  661.     *index_length = AV_RB32(&buf[0]);

  662. }

  663. 

  664. static int update_stream_extradata(AVFormatContext *s, OutputStream *os,

  665.                                    AVCodecParameters *par)

  666. {

  667.     uint8_t *extradata;

  668. 

  669.     if (os->ctx->streams[0]->codecpar->extradata_size || !par->extradata_size)

  670.         return 0;

  671. 

  672.     extradata = av_malloc(par->extradata_size);

  673. 

  674.     if (!extradata)

  675.         return AVERROR(ENOMEM);

  676. 

  677.     memcpy(extradata, par->extradata, par->extradata_size);

  678. 

  679.     os->ctx->streams[0]->codecpar->extradata = extradata;

  680.     os->ctx->streams[0]->codecpar->extradata_size = par->extradata_size;

  681. 

  682.     set_codec_str(s, par, os->codec_str, sizeof(os->codec_str));

  683. 

  684.     return 0;

  685. }

  686. 

  687. static int dash_flush(AVFormatContext *s, int final, int stream)

  688. {

  689.     DASHContext *c = s->priv_data;

  690.     int i, ret = 0;

  691. 

  692.     const char *proto = avio_find_protocol_name(s->filename);

  693.     int use_rename = proto && !strcmp(proto, "file");

  694. 

  695.     int cur_flush_segment_index = 0;

  696.     if (stream >= 0)

  697.         cur_flush_segment_index = c->streams[stream].segment_index;

  698. 

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

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

  701.         char filename[1024] = "", full_path[1024], temp_path[1024];

  702.         int64_t start_pos;

  703.         int range_length, index_length = 0;

  704. 

  705.         if (!os->packets_written)

  706.             continue;

  707. 

  708.         // Flush the single stream that got a keyframe right now.

  709.         // Flush all audio streams as well, in sync with video keyframes,

  710.         // but not the other video streams.

  711.         if (stream >= 0 && i != stream) {

  712.             if (s->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)

  713.                 continue;

  714.             // Make sure we don't flush audio streams multiple times, when

  715.             // all video streams are flushed one at a time.

  716.             if (c->has_video && os->segment_index > cur_flush_segment_index)

  717.                 continue;

  718.         }

  719. 

  720.         if (!os->init_range_length) {

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

  722.             os->init_range_length = avio_tell(os->ctx->pb);

  723.             if (!c->single_file)

  724.                 ff_format_io_close(s, &os->out);

  725.         }

  726. 

  727.         start_pos = avio_tell(os->ctx->pb);

  728. 

  729.         if (!c->single_file) {

  730.             ff_dash_fill_tmpl_params(filename, sizeof(filename), c->media_seg_name, i, os->segment_index, os->bit_rate, os->start_pts);

  731.             snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, filename);

  732.             snprintf(temp_path, sizeof(temp_path), use_rename ? "%s.tmp" : "%s", full_path);

  733.             ret = s->io_open(s, &os->out, temp_path, AVIO_FLAG_WRITE, NULL);

  734.             if (ret < 0)

  735.                 break;

  736.             write_styp(os->ctx->pb);

  737.         } else {

  738.             snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, os->initfile);

  739.         }

  740. 

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

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

  743.         os->packets_written = 0;

  744. 

  745.         range_length = avio_tell(os->ctx->pb) - start_pos;

  746.         if (c->single_file) {

  747.             find_index_range(s, full_path, start_pos, &index_length);

  748.         } else {

  749.             ff_format_io_close(s, &os->out);

  750. 

  751.             if (use_rename) {

  752.                 ret = avpriv_io_move(temp_path, full_path);

  753.                 if (ret < 0)

  754.                     break;

  755.             }

  756.         }

  757. 

  758.         if (!os->bit_rate) {

  759.             // calculate average bitrate of first segment

  760.             int64_t bitrate = (int64_t) range_length * 8 * AV_TIME_BASE / (os->max_pts - os->start_pts);

  761.             if (bitrate >= 0) {

  762.                 os->bit_rate = bitrate;

  763.                 snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),

  764.                      " bandwidth=\"%d\"", os->bit_rate);

  765.             }

  766.         }

  767.         add_segment(os, filename, os->start_pts, os->max_pts - os->start_pts, start_pos, range_length, index_length);

  768.         av_log(s, AV_LOG_VERBOSE, "Representation %d media segment %d written to: %s\n", i, os->segment_index, full_path);

  769.     }

  770. 

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

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

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

  774.             int j;

  775.             int remove = os->nb_segments - c->window_size - c->extra_window_size;

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

  777.                 remove = os->nb_segments;

  778.             if (remove > 0) {

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

  780.                     char filename[1024];

  781.                     snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->segments[j]->file);

  782.                     unlink(filename);

  783.                     av_free(os->segments[j]);

  784.                 }

  785.                 os->nb_segments -= remove;

  786.                 memmove(os->segments, os->segments + remove, os->nb_segments * sizeof(*os->segments));

  787.             }

  788.         }

  789.     }

  790. 

  791.     if (ret >= 0)

  792.         ret = write_manifest(s, final);

  793.     return ret;

  794. }

  795. 

  796. static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)

  797. {

  798.     DASHContext *c = s->priv_data;

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

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

  801.     int ret;

  802. 

  803.     ret = update_stream_extradata(s, os, st->codecpar);

  804.     if (ret < 0)

  805.         return ret;

  806. 

  807.     // Fill in a heuristic guess of the packet duration, if none is available.

  808.     // The mp4 muxer will do something similar (for the last packet in a fragment)

  809.     // if nothing is set (setting it for the other packets doesn't hurt).

  810.     // By setting a nonzero duration here, we can be sure that the mp4 muxer won't

  811.     // invoke its heuristic (this doesn't have to be identical to that algorithm),

  812.     // so that we know the exact timestamps of fragments.

  813.     if (!pkt->duration && os->last_dts != AV_NOPTS_VALUE)

  814.         pkt->duration = pkt->dts - os->last_dts;

  815.     os->last_dts = pkt->dts;

  816. 

  817.     // If forcing the stream to start at 0, the mp4 muxer will set the start

  818.     // timestamps to 0. Do the same here, to avoid mismatches in duration/timestamps.

  819.     if (os->first_pts == AV_NOPTS_VALUE &&

  820.         s->avoid_negative_ts == AVFMT_AVOID_NEG_TS_MAKE_ZERO) {

  821.         pkt->pts -= pkt->dts;

  822.         pkt->dts  = 0;

  823.     }

  824. 

  825.     if (os->first_pts == AV_NOPTS_VALUE)

  826.         os->first_pts = pkt->pts;

  827. 

  828.     if ((!c->has_video || st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) &&

  829.         pkt->flags & AV_PKT_FLAG_KEY && os->packets_written &&

  830.         av_compare_ts(pkt->pts - os->start_pts, st->time_base,

  831.                       c->min_seg_duration, AV_TIME_BASE_Q) >= 0) {

  832.         int64_t prev_duration = c->last_duration;

  833. 

  834.         c->last_duration = av_rescale_q(pkt->pts - os->start_pts,

  835.                                         st->time_base,

  836.                                         AV_TIME_BASE_Q);

  837.         c->total_duration = av_rescale_q(pkt->pts - os->first_pts,

  838.                                          st->time_base,

  839.                                          AV_TIME_BASE_Q);

  840. 

  841.         if ((!c->use_timeline || !c->use_template) && prev_duration) {

  842.             if (c->last_duration < prev_duration*9/10 ||

  843.                 c->last_duration > prev_duration*11/10) {

  844.                 av_log(s, AV_LOG_WARNING,

  845.                        "Segment durations differ too much, enable use_timeline "

  846.                        "and use_template, or keep a stricter keyframe interval\n");

  847.             }

  848.         }

  849. 

  850.         if ((ret = dash_flush(s, 0, pkt->stream_index)) < 0)

  851.             return ret;

  852.     }

  853. 

  854.     if (!os->packets_written) {

  855.         // If we wrote a previous segment, adjust the start time of the segment

  856.         // to the end of the previous one (which is the same as the mp4 muxer

  857.         // does). This avoids gaps in the timeline.

  858.         if (os->max_pts != AV_NOPTS_VALUE)

  859.             os->start_pts = os->max_pts;

  860.         else

  861.             os->start_pts = pkt->pts;

  862.     }

  863.     if (os->max_pts == AV_NOPTS_VALUE)

  864.         os->max_pts = pkt->pts + pkt->duration;

  865.     else

  866.         os->max_pts = FFMAX(os->max_pts, pkt->pts + pkt->duration);

  867.     os->packets_written++;

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

  869. }

  870. 

  871. static int dash_write_trailer(AVFormatContext *s)

  872. {

  873.     DASHContext *c = s->priv_data;

  874. 

  875.     if (s->nb_streams > 0) {

  876.         OutputStream *os = &c->streams[0];

  877.         // If no segments have been written so far, try to do a crude

  878.         // guess of the segment duration

  879.         if (!c->last_duration)

  880.             c->last_duration = av_rescale_q(os->max_pts - os->start_pts,

  881.                                             s->streams[0]->time_base,

  882.                                             AV_TIME_BASE_Q);

  883.         c->total_duration = av_rescale_q(os->max_pts - os->first_pts,

  884.                                          s->streams[0]->time_base,

  885.                                          AV_TIME_BASE_Q);

  886.     }

  887.     dash_flush(s, 1, -1);

  888. 

  889.     if (c->remove_at_exit) {

  890.         char filename[1024];

  891.         int i;

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

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

  894.             snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);

  895.             unlink(filename);

  896.         }

  897.         unlink(s->filename);

  898.     }

  899. 

  900.     return 0;

  901. }

  902. 

  903. static int dash_check_bitstream(struct AVFormatContext *s, const AVPacket *avpkt)

  904. {

  905.     DASHContext *c = s->priv_data;

  906.     OutputStream *os = &c->streams[avpkt->stream_index];

  907.     AVFormatContext *oc = os->ctx;

  908.     if (oc->oformat->check_bitstream) {

  909.         int ret;

  910.         AVPacket pkt = *avpkt;

  911.         pkt.stream_index = 0;

  912.         ret = oc->oformat->check_bitstream(oc, &pkt);

  913.         if (ret == 1) {

  914.             AVStream *st = s->streams[avpkt->stream_index];

  915.             AVStream *ost = oc->streams[0];

  916.             st->internal->bsfcs = ost->internal->bsfcs;

  917.             st->internal->nb_bsfcs = ost->internal->nb_bsfcs;

  918.             ost->internal->bsfcs = NULL;

  919.             ost->internal->nb_bsfcs = 0;

  920.         }

  921.         return ret;

  922.     }

  923.     return 1;

  924. }

  925. 

  926. #define OFFSET(x) offsetof(DASHContext, x)

  927. #define E AV_OPT_FLAG_ENCODING_PARAM

  928. static const AVOption options[] = {

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

  930.     { "extra_window_size", "number of segments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E },

  931.     { "min_seg_duration", "minimum segment duration (in microseconds)", OFFSET(min_seg_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },

  932.     { "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },

  933.     { "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },

  934.     { "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },

  935.     { "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },

  936.     { "single_file_name", "DASH-templated name to be used for baseURL. Implies storing all segments in one file, accessed using byte ranges", OFFSET(single_file_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },

  937.     { "init_seg_name", "DASH-templated name to used for the initialization segment", OFFSET(init_seg_name), AV_OPT_TYPE_STRING, {.str = "init-stream$RepresentationID$.m4s"}, 0, 0, E },

  938.     { "media_seg_name", "DASH-templated name to used for the media segments", OFFSET(media_seg_name), AV_OPT_TYPE_STRING, {.str = "chunk-stream$RepresentationID$-$Number%05d$.m4s"}, 0, 0, E },

  939.     { "utc_timing_url", "URL of the page that will return the UTC timestamp in ISO format", OFFSET(utc_timing_url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, E },

  940.     { NULL },

  941. };

  942. 

  943. static const AVClass dash_class = {

  944.     .class_name = "dash muxer",

  945.     .item_name  = av_default_item_name,

  946.     .option     = options,

  947.     .version    = LIBAVUTIL_VERSION_INT,

  948. };

  949. 

  950. AVOutputFormat ff_dash_muxer = {

  951.     .name           = "dash",

  952.     .long_name      = NULL_IF_CONFIG_SMALL("DASH Muxer"),

  953.     .priv_data_size = sizeof(DASHContext),

  954.     .audio_codec    = AV_CODEC_ID_AAC,

  955.     .video_codec    = AV_CODEC_ID_H264,

  956.     .flags          = AVFMT_GLOBALHEADER | AVFMT_NOFILE | AVFMT_TS_NEGATIVE,

  957.     .init           = dash_init,

  958.     .write_header   = dash_write_header,

  959.     .write_packet   = dash_write_packet,

  960.     .write_trailer  = dash_write_trailer,

  961.     .deinit         = dash_free,

  962.     .check_bitstream = dash_check_bitstream,

  963.     .priv_class     = &dash_class,

  964. };