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