yading@11: /*
yading@11:  * Live smooth streaming fragmenter
yading@11:  * Copyright (c) 2012 Martin Storsjo
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "config.h"
yading@11: #include <float.h>
yading@11: #if HAVE_UNISTD_H
yading@11: #include <unistd.h>
yading@11: #endif
yading@11: 
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "os_support.h"
yading@11: #include "avc.h"
yading@11: #include "url.h"
yading@11: #include "isom.h"
yading@11: 
yading@11: #include "libavutil/opt.h"
yading@11: #include "libavutil/avstring.h"
yading@11: #include "libavutil/mathematics.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: 
yading@11: typedef struct {
yading@11:     char file[1024];
yading@11:     char infofile[1024];
yading@11:     int64_t start_time, duration;
yading@11:     int n;
yading@11:     int64_t start_pos, size;
yading@11: } Fragment;
yading@11: 
yading@11: typedef struct {
yading@11:     AVFormatContext *ctx;
yading@11:     int ctx_inited;
yading@11:     char dirname[1024];
yading@11:     uint8_t iobuf[32768];
yading@11:     URLContext *out;  // Current output stream where all output is written
yading@11:     URLContext *out2; // Auxiliary output stream where all output is also written
yading@11:     URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere
yading@11:     int64_t tail_pos, cur_pos, cur_start_pos;
yading@11:     int packets_written;
yading@11:     const char *stream_type_tag;
yading@11:     int nb_fragments, fragments_size, fragment_index;
yading@11:     Fragment **fragments;
yading@11: 
yading@11:     const char *fourcc;
yading@11:     char *private_str;
yading@11:     int packet_size;
yading@11:     int audio_tag;
yading@11: } OutputStream;
yading@11: 
yading@11: typedef struct {
yading@11:     const AVClass *class;  /* Class for private options. */
yading@11:     int window_size;
yading@11:     int extra_window_size;
yading@11:     int lookahead_count;
yading@11:     int min_frag_duration;
yading@11:     int remove_at_exit;
yading@11:     OutputStream *streams;
yading@11:     int has_video, has_audio;
yading@11:     int nb_fragments;
yading@11: } SmoothStreamingContext;
yading@11: 
yading@11: static int ism_write(void *opaque, uint8_t *buf, int buf_size)
yading@11: {
yading@11:     OutputStream *os = opaque;
yading@11:     if (os->out)
yading@11:         ffurl_write(os->out, buf, buf_size);
yading@11:     if (os->out2)
yading@11:         ffurl_write(os->out2, buf, buf_size);
yading@11:     os->cur_pos += buf_size;
yading@11:     if (os->cur_pos >= os->tail_pos)
yading@11:         os->tail_pos = os->cur_pos;
yading@11:     return buf_size;
yading@11: }
yading@11: 
yading@11: static int64_t ism_seek(void *opaque, int64_t offset, int whence)
yading@11: {
yading@11:     OutputStream *os = opaque;
yading@11:     int i;
yading@11:     if (whence != SEEK_SET)
yading@11:         return AVERROR(ENOSYS);
yading@11:     if (os->tail_out) {
yading@11:         if (os->out) {
yading@11:             ffurl_close(os->out);
yading@11:         }
yading@11:         if (os->out2) {
yading@11:             ffurl_close(os->out2);
yading@11:         }
yading@11:         os->out = os->tail_out;
yading@11:         os->out2 = NULL;
yading@11:         os->tail_out = NULL;
yading@11:     }
yading@11:     if (offset >= os->cur_start_pos) {
yading@11:         if (os->out)
yading@11:             ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET);
yading@11:         os->cur_pos = offset;
yading@11:         return offset;
yading@11:     }
yading@11:     for (i = os->nb_fragments - 1; i >= 0; i--) {
yading@11:         Fragment *frag = os->fragments[i];
yading@11:         if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) {
yading@11:             int ret;
yading@11:             AVDictionary *opts = NULL;
yading@11:             os->tail_out = os->out;
yading@11:             av_dict_set(&opts, "truncate", "0", 0);
yading@11:             ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);
yading@11:             av_dict_free(&opts);
yading@11:             if (ret < 0) {
yading@11:                 os->out = os->tail_out;
yading@11:                 os->tail_out = NULL;
yading@11:                 return ret;
yading@11:             }
yading@11:             av_dict_set(&opts, "truncate", "0", 0);
yading@11:             ffurl_open(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts);
yading@11:             av_dict_free(&opts);
yading@11:             ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET);
yading@11:             if (os->out2)
yading@11:                 ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET);
yading@11:             os->cur_pos = offset;
yading@11:             return offset;
yading@11:         }
yading@11:     }
yading@11:     return AVERROR(EIO);
yading@11: }
yading@11: 
yading@11: static void get_private_data(OutputStream *os)
yading@11: {
yading@11:     AVCodecContext *codec = os->ctx->streams[0]->codec;
yading@11:     uint8_t *ptr = codec->extradata;
yading@11:     int size = codec->extradata_size;
yading@11:     int i;
yading@11:     if (codec->codec_id == AV_CODEC_ID_H264) {
yading@11:         ff_avc_write_annexb_extradata(ptr, &ptr, &size);
yading@11:         if (!ptr)
yading@11:             ptr = codec->extradata;
yading@11:     }
yading@11:     if (!ptr)
yading@11:         return;
yading@11:     os->private_str = av_mallocz(2*size + 1);
yading@11:     for (i = 0; i < size; i++)
yading@11:         snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]);
yading@11:     if (ptr != codec->extradata)
yading@11:         av_free(ptr);
yading@11: }
yading@11: 
yading@11: static void ism_free(AVFormatContext *s)
yading@11: {
yading@11:     SmoothStreamingContext *c = s->priv_data;
yading@11:     int i, j;
yading@11:     if (!c->streams)
yading@11:         return;
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         OutputStream *os = &c->streams[i];
yading@11:         ffurl_close(os->out);
yading@11:         ffurl_close(os->out2);
yading@11:         ffurl_close(os->tail_out);
yading@11:         os->out = os->out2 = os->tail_out = NULL;
yading@11:         if (os->ctx && os->ctx_inited)
yading@11:             av_write_trailer(os->ctx);
yading@11:         if (os->ctx && os->ctx->pb)
yading@11:             av_free(os->ctx->pb);
yading@11:         if (os->ctx)
yading@11:             avformat_free_context(os->ctx);
yading@11:         av_free(os->private_str);
yading@11:         for (j = 0; j < os->nb_fragments; j++)
yading@11:             av_free(os->fragments[j]);
yading@11:         av_free(os->fragments);
yading@11:     }
yading@11:     av_freep(&c->streams);
yading@11: }
yading@11: 
yading@11: static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size)
yading@11: {
yading@11:     int removed = 0, i, start = 0;
yading@11:     if (os->nb_fragments <= 0)
yading@11:         return;
yading@11:     if (os->fragments[0]->n > 0)
yading@11:         removed = 1;
yading@11:     if (final)
yading@11:         skip = 0;
yading@11:     if (window_size)
yading@11:         start = FFMAX(os->nb_fragments - skip - window_size, 0);
yading@11:     for (i = start; i < os->nb_fragments - skip; i++) {
yading@11:         Fragment *frag = os->fragments[i];
yading@11:         if (!final || removed)
yading@11:             avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration);
yading@11:         else
yading@11:             avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration);
yading@11:     }
yading@11: }
yading@11: 
yading@11: static int write_manifest(AVFormatContext *s, int final)
yading@11: {
yading@11:     SmoothStreamingContext *c = s->priv_data;
yading@11:     AVIOContext *out;
yading@11:     char filename[1024];
yading@11:     int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0;
yading@11:     int64_t duration = 0;
yading@11: 
yading@11:     snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
yading@11:     ret = avio_open2(&out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
yading@11:     if (ret < 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", filename);
yading@11:         return ret;
yading@11:     }
yading@11:     avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         OutputStream *os = &c->streams[i];
yading@11:         if (os->nb_fragments > 0) {
yading@11:             Fragment *last = os->fragments[os->nb_fragments - 1];
yading@11:             duration = last->start_time + last->duration;
yading@11:         }
yading@11:         if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
yading@11:             video_chunks = os->nb_fragments;
yading@11:             video_streams++;
yading@11:         } else {
yading@11:             audio_chunks = os->nb_fragments;
yading@11:             audio_streams++;
yading@11:         }
yading@11:     }
yading@11:     if (!final) {
yading@11:         duration = 0;
yading@11:         video_chunks = audio_chunks = 0;
yading@11:     }
yading@11:     if (c->window_size) {
yading@11:         video_chunks = FFMIN(video_chunks, c->window_size);
yading@11:         audio_chunks = FFMIN(audio_chunks, c->window_size);
yading@11:     }
yading@11:     avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration);
yading@11:     if (!final)
yading@11:         avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count);
yading@11:     avio_printf(out, ">\n");
yading@11:     if (c->has_video) {
yading@11:         int last = -1, index = 0;
yading@11:         avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks);
yading@11:         for (i = 0; i < s->nb_streams; i++) {
yading@11:             OutputStream *os = &c->streams[i];
yading@11:             if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO)
yading@11:                 continue;
yading@11:             last = i;
yading@11:             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);
yading@11:             index++;
yading@11:         }
yading@11:         output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
yading@11:         avio_printf(out, "</StreamIndex>\n");
yading@11:     }
yading@11:     if (c->has_audio) {
yading@11:         int last = -1, index = 0;
yading@11:         avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks);
yading@11:         for (i = 0; i < s->nb_streams; i++) {
yading@11:             OutputStream *os = &c->streams[i];
yading@11:             if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
yading@11:                 continue;
yading@11:             last = i;
yading@11:             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);
yading@11:             index++;
yading@11:         }
yading@11:         output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size);
yading@11:         avio_printf(out, "</StreamIndex>\n");
yading@11:     }
yading@11:     avio_printf(out, "</SmoothStreamingMedia>\n");
yading@11:     avio_flush(out);
yading@11:     avio_close(out);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int ism_write_header(AVFormatContext *s)
yading@11: {
yading@11:     SmoothStreamingContext *c = s->priv_data;
yading@11:     int ret = 0, i;
yading@11:     AVOutputFormat *oformat;
yading@11: 
yading@11:     if (mkdir(s->filename, 0777) < 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "mkdir failed\n");
yading@11:         ret = AVERROR(errno);
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     oformat = av_guess_format("ismv", NULL, NULL);
yading@11:     if (!oformat) {
yading@11:         ret = AVERROR_MUXER_NOT_FOUND;
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     c->streams = av_mallocz(sizeof(*c->streams) * s->nb_streams);
yading@11:     if (!c->streams) {
yading@11:         ret = AVERROR(ENOMEM);
yading@11:         goto fail;
yading@11:     }
yading@11: 
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         OutputStream *os = &c->streams[i];
yading@11:         AVFormatContext *ctx;
yading@11:         AVStream *st;
yading@11:         AVDictionary *opts = NULL;
yading@11:         char buf[10];
yading@11: 
yading@11:         if (!s->streams[i]->codec->bit_rate) {
yading@11:             av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i);
yading@11:             ret = AVERROR(EINVAL);
yading@11:             goto fail;
yading@11:         }
yading@11:         snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate);
yading@11:         if (mkdir(os->dirname, 0777) < 0) {
yading@11:             ret = AVERROR(errno);
yading@11:             av_log(s, AV_LOG_ERROR, "mkdir failed\n");
yading@11:             goto fail;
yading@11:         }
yading@11: 
yading@11:         ctx = avformat_alloc_context();
yading@11:         if (!ctx) {
yading@11:             ret = AVERROR(ENOMEM);
yading@11:             goto fail;
yading@11:         }
yading@11:         os->ctx = ctx;
yading@11:         ctx->oformat = oformat;
yading@11:         ctx->interrupt_callback = s->interrupt_callback;
yading@11: 
yading@11:         if (!(st = avformat_new_stream(ctx, NULL))) {
yading@11:             ret = AVERROR(ENOMEM);
yading@11:             goto fail;
yading@11:         }
yading@11:         avcodec_copy_context(st->codec, s->streams[i]->codec);
yading@11:         st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio;
yading@11: 
yading@11:         ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek);
yading@11:         if (!ctx->pb) {
yading@11:             ret = AVERROR(ENOMEM);
yading@11:             goto fail;
yading@11:         }
yading@11: 
yading@11:         snprintf(buf, sizeof(buf), "%d", c->lookahead_count);
yading@11:         av_dict_set(&opts, "ism_lookahead", buf, 0);
yading@11:         av_dict_set(&opts, "movflags", "frag_custom", 0);
yading@11:         if ((ret = avformat_write_header(ctx, &opts)) < 0) {
yading@11:              goto fail;
yading@11:         }
yading@11:         os->ctx_inited = 1;
yading@11:         avio_flush(ctx->pb);
yading@11:         av_dict_free(&opts);
yading@11:         s->streams[i]->time_base = st->time_base;
yading@11:         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
yading@11:             c->has_video = 1;
yading@11:             os->stream_type_tag = "video";
yading@11:             if (st->codec->codec_id == AV_CODEC_ID_H264) {
yading@11:                 os->fourcc = "H264";
yading@11:             } else if (st->codec->codec_id == AV_CODEC_ID_VC1) {
yading@11:                 os->fourcc = "WVC1";
yading@11:             } else {
yading@11:                 av_log(s, AV_LOG_ERROR, "Unsupported video codec\n");
yading@11:                 ret = AVERROR(EINVAL);
yading@11:                 goto fail;
yading@11:             }
yading@11:         } else {
yading@11:             c->has_audio = 1;
yading@11:             os->stream_type_tag = "audio";
yading@11:             if (st->codec->codec_id == AV_CODEC_ID_AAC) {
yading@11:                 os->fourcc = "AACL";
yading@11:                 os->audio_tag = 0xff;
yading@11:             } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) {
yading@11:                 os->fourcc = "WMAP";
yading@11:                 os->audio_tag = 0x0162;
yading@11:             } else {
yading@11:                 av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n");
yading@11:                 ret = AVERROR(EINVAL);
yading@11:                 goto fail;
yading@11:             }
yading@11:             os->packet_size = st->codec->block_align ? st->codec->block_align : 4;
yading@11:         }
yading@11:         get_private_data(os);
yading@11:     }
yading@11: 
yading@11:     if (!c->has_video && c->min_frag_duration <= 0) {
yading@11:         av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n");
yading@11:         ret = AVERROR(EINVAL);
yading@11:     }
yading@11:     ret = write_manifest(s, 0);
yading@11: 
yading@11: fail:
yading@11:     if (ret)
yading@11:         ism_free(s);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size)
yading@11: {
yading@11:     AVIOContext *in;
yading@11:     int ret;
yading@11:     uint32_t len;
yading@11:     if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)
yading@11:         return ret;
yading@11:     ret = AVERROR(EIO);
yading@11:     *moof_size = avio_rb32(in);
yading@11:     if (*moof_size < 8 || *moof_size > size)
yading@11:         goto fail;
yading@11:     if (avio_rl32(in) != MKTAG('m','o','o','f'))
yading@11:         goto fail;
yading@11:     len = avio_rb32(in);
yading@11:     if (len > *moof_size)
yading@11:         goto fail;
yading@11:     if (avio_rl32(in) != MKTAG('m','f','h','d'))
yading@11:         goto fail;
yading@11:     avio_seek(in, len - 8, SEEK_CUR);
yading@11:     avio_rb32(in); /* traf size */
yading@11:     if (avio_rl32(in) != MKTAG('t','r','a','f'))
yading@11:         goto fail;
yading@11:     while (avio_tell(in) < *moof_size) {
yading@11:         uint32_t len = avio_rb32(in);
yading@11:         uint32_t tag = avio_rl32(in);
yading@11:         int64_t end = avio_tell(in) + len - 8;
yading@11:         if (len < 8 || len >= *moof_size)
yading@11:             goto fail;
yading@11:         if (tag == MKTAG('u','u','i','d')) {
yading@11:             const uint8_t tfxd[] = {
yading@11:                 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
yading@11:                 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
yading@11:             };
yading@11:             uint8_t uuid[16];
yading@11:             avio_read(in, uuid, 16);
yading@11:             if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) {
yading@11:                 avio_seek(in, 4, SEEK_CUR);
yading@11:                 *start_ts = avio_rb64(in);
yading@11:                 *duration = avio_rb64(in);
yading@11:                 ret = 0;
yading@11:                 break;
yading@11:             }
yading@11:         }
yading@11:         avio_seek(in, end, SEEK_SET);
yading@11:     }
yading@11: fail:
yading@11:     avio_close(in);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: 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)
yading@11: {
yading@11:     Fragment *frag;
yading@11:     if (os->nb_fragments >= os->fragments_size) {
yading@11:         os->fragments_size = (os->fragments_size + 1) * 2;
yading@11:         os->fragments = av_realloc(os->fragments, sizeof(*os->fragments)*os->fragments_size);
yading@11:         if (!os->fragments)
yading@11:             return AVERROR(ENOMEM);
yading@11:     }
yading@11:     frag = av_mallocz(sizeof(*frag));
yading@11:     if (!frag)
yading@11:         return AVERROR(ENOMEM);
yading@11:     av_strlcpy(frag->file, file, sizeof(frag->file));
yading@11:     av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile));
yading@11:     frag->start_time = start_time;
yading@11:     frag->duration = duration;
yading@11:     frag->start_pos = start_pos;
yading@11:     frag->size = size;
yading@11:     frag->n = os->fragment_index;
yading@11:     os->fragments[os->nb_fragments++] = frag;
yading@11:     os->fragment_index++;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size)
yading@11: {
yading@11:     AVIOContext *in, *out;
yading@11:     int ret = 0;
yading@11:     if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0)
yading@11:         return ret;
yading@11:     if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) {
yading@11:         avio_close(in);
yading@11:         return ret;
yading@11:     }
yading@11:     while (size > 0) {
yading@11:         uint8_t buf[8192];
yading@11:         int n = FFMIN(size, sizeof(buf));
yading@11:         n = avio_read(in, buf, n);
yading@11:         if (n <= 0) {
yading@11:             ret = AVERROR(EIO);
yading@11:             break;
yading@11:         }
yading@11:         avio_write(out, buf, n);
yading@11:         size -= n;
yading@11:     }
yading@11:     avio_flush(out);
yading@11:     avio_close(out);
yading@11:     avio_close(in);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int ism_flush(AVFormatContext *s, int final)
yading@11: {
yading@11:     SmoothStreamingContext *c = s->priv_data;
yading@11:     int i, ret = 0;
yading@11: 
yading@11:     for (i = 0; i < s->nb_streams; i++) {
yading@11:         OutputStream *os = &c->streams[i];
yading@11:         char filename[1024], target_filename[1024], header_filename[1024];
yading@11:         int64_t start_pos = os->tail_pos, size;
yading@11:         int64_t start_ts, duration, moof_size;
yading@11:         if (!os->packets_written)
yading@11:             continue;
yading@11: 
yading@11:         snprintf(filename, sizeof(filename), "%s/temp", os->dirname);
yading@11:         ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
yading@11:         if (ret < 0)
yading@11:             break;
yading@11:         os->cur_start_pos = os->tail_pos;
yading@11:         av_write_frame(os->ctx, NULL);
yading@11:         avio_flush(os->ctx->pb);
yading@11:         os->packets_written = 0;
yading@11:         if (!os->out || os->tail_out)
yading@11:             return AVERROR(EIO);
yading@11: 
yading@11:         ffurl_close(os->out);
yading@11:         os->out = NULL;
yading@11:         size = os->tail_pos - start_pos;
yading@11:         if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0)
yading@11:             break;
yading@11:         snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
yading@11:         snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts);
yading@11:         copy_moof(s, filename, header_filename, moof_size);
yading@11:         rename(filename, target_filename);
yading@11:         add_fragment(os, target_filename, header_filename, start_ts, duration, start_pos, size);
yading@11:     }
yading@11: 
yading@11:     if (c->window_size || (final && c->remove_at_exit)) {
yading@11:         for (i = 0; i < s->nb_streams; i++) {
yading@11:             OutputStream *os = &c->streams[i];
yading@11:             int j;
yading@11:             int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count;
yading@11:             if (final && c->remove_at_exit)
yading@11:                 remove = os->nb_fragments;
yading@11:             if (remove > 0) {
yading@11:                 for (j = 0; j < remove; j++) {
yading@11:                     unlink(os->fragments[j]->file);
yading@11:                     unlink(os->fragments[j]->infofile);
yading@11:                     av_free(os->fragments[j]);
yading@11:                 }
yading@11:                 os->nb_fragments -= remove;
yading@11:                 memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments));
yading@11:             }
yading@11:             if (final && c->remove_at_exit)
yading@11:                 rmdir(os->dirname);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     if (ret >= 0)
yading@11:         ret = write_manifest(s, final);
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: static int ism_write_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     SmoothStreamingContext *c = s->priv_data;
yading@11:     AVStream *st = s->streams[pkt->stream_index];
yading@11:     OutputStream *os = &c->streams[pkt->stream_index];
yading@11:     int64_t end_dts = (c->nb_fragments + 1LL) * c->min_frag_duration;
yading@11:     int ret;
yading@11: 
yading@11:     if (st->first_dts == AV_NOPTS_VALUE)
yading@11:         st->first_dts = pkt->dts;
yading@11: 
yading@11:     if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
yading@11:         av_compare_ts(pkt->dts - st->first_dts, st->time_base,
yading@11:                       end_dts, AV_TIME_BASE_Q) >= 0 &&
yading@11:         pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) {
yading@11: 
yading@11:         if ((ret = ism_flush(s, 0)) < 0)
yading@11:             return ret;
yading@11:         c->nb_fragments++;
yading@11:     }
yading@11: 
yading@11:     os->packets_written++;
yading@11:     return ff_write_chained(os->ctx, 0, pkt, s);
yading@11: }
yading@11: 
yading@11: static int ism_write_trailer(AVFormatContext *s)
yading@11: {
yading@11:     SmoothStreamingContext *c = s->priv_data;
yading@11:     ism_flush(s, 1);
yading@11: 
yading@11:     if (c->remove_at_exit) {
yading@11:         char filename[1024];
yading@11:         snprintf(filename, sizeof(filename), "%s/Manifest", s->filename);
yading@11:         unlink(filename);
yading@11:         rmdir(s->filename);
yading@11:     }
yading@11: 
yading@11:     ism_free(s);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: #define OFFSET(x) offsetof(SmoothStreamingContext, x)
yading@11: #define E AV_OPT_FLAG_ENCODING_PARAM
yading@11: static const AVOption options[] = {
yading@11:     { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E },
yading@11:     { "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 },
yading@11:     { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E },
yading@11:     { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E },
yading@11:     { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
yading@11:     { NULL },
yading@11: };
yading@11: 
yading@11: static const AVClass ism_class = {
yading@11:     .class_name = "smooth streaming muxer",
yading@11:     .item_name  = av_default_item_name,
yading@11:     .option     = options,
yading@11:     .version    = LIBAVUTIL_VERSION_INT,
yading@11: };
yading@11: 
yading@11: 
yading@11: AVOutputFormat ff_smoothstreaming_muxer = {
yading@11:     .name           = "smoothstreaming",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"),
yading@11:     .priv_data_size = sizeof(SmoothStreamingContext),
yading@11:     .audio_codec    = AV_CODEC_ID_AAC,
yading@11:     .video_codec    = AV_CODEC_ID_H264,
yading@11:     .flags          = AVFMT_GLOBALHEADER | AVFMT_NOFILE,
yading@11:     .write_header   = ism_write_header,
yading@11:     .write_packet   = ism_write_packet,
yading@11:     .write_trailer  = ism_write_trailer,
yading@11:     .codec_tag      = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 },
yading@11:     .priv_class     = &ism_class,
yading@11: };