2011-10-02 21:05:29 +00:00
/*
* Generic segmenter
* Copyright ( c ) 2011 , Luca Barbato
*
* This file is part of Libav .
*
* Libav is free software ; you can redistribute it and / or
* 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 .
*
* Libav is distributed in the hope that it will be useful ,
* 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
* License along with Libav ; if not , write to the Free Software
* Foundation , Inc . , 51 Franklin Street , Fifth Floor , Boston , MA 02110 - 1301 USA
*/
# include <float.h>
# include "avformat.h"
# include "internal.h"
# include "libavutil/log.h"
# include "libavutil/opt.h"
# include "libavutil/avstring.h"
# include "libavutil/parseutils.h"
# include "libavutil/mathematics.h"
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typedef struct SegmentContext {
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const AVClass * class ; /**< Class for private options. */
int number ;
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AVOutputFormat * oformat ;
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AVFormatContext * avf ;
char * format ; /**< Set by a private option. */
char * list ; /**< Set by a private option. */
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char * entry_prefix ; /**< Set by a private option. */
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int list_type ; /**< Set by a private option. */
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float time ; /**< Set by a private option. */
int size ; /**< Set by a private option. */
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int wrap ; /**< Set by a private option. */
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int individual_header_trailer ; /**< Set by a private option. */
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int write_header_trailer ; /**< Set by a private option. */
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int64_t offset_time ;
int64_t recording_time ;
int has_video ;
AVIOContext * pb ;
} SegmentContext ;
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enum {
LIST_FLAT ,
LIST_HLS
} ;
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static int segment_mux_init ( AVFormatContext * s )
{
SegmentContext * seg = s - > priv_data ;
AVFormatContext * oc ;
int i ;
seg - > avf = oc = avformat_alloc_context ( ) ;
if ( ! oc )
return AVERROR ( ENOMEM ) ;
oc - > oformat = seg - > oformat ;
oc - > interrupt_callback = s - > interrupt_callback ;
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oc - > opaque = s - > opaque ;
oc - > io_close = s - > io_close ;
oc - > io_open = s - > io_open ;
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for ( i = 0 ; i < s - > nb_streams ; i + + ) {
AVStream * st ;
if ( ! ( st = avformat_new_stream ( oc , NULL ) ) )
return AVERROR ( ENOMEM ) ;
lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
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avcodec_parameters_copy ( st - > codecpar , s - > streams [ i ] - > codecpar ) ;
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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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}
return 0 ;
}
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static int segment_hls_window ( AVFormatContext * s , int last )
{
SegmentContext * seg = s - > priv_data ;
int i , ret = 0 ;
char buf [ 1024 ] ;
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if ( ( ret = s - > io_open ( s , & seg - > pb , seg - > list , AVIO_FLAG_WRITE , NULL ) ) < 0 )
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goto fail ;
avio_printf ( seg - > pb , " #EXTM3U \n " ) ;
avio_printf ( seg - > pb , " #EXT-X-VERSION:3 \n " ) ;
avio_printf ( seg - > pb , " #EXT-X-TARGETDURATION:%d \n " , ( int ) seg - > time ) ;
avio_printf ( seg - > pb , " #EXT-X-MEDIA-SEQUENCE:%d \n " ,
FFMAX ( 0 , seg - > number - seg - > size ) ) ;
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av_log ( s , AV_LOG_VERBOSE , " EXT-X-MEDIA-SEQUENCE:%d \n " ,
FFMAX ( 0 , seg - > number - seg - > size ) ) ;
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for ( i = FFMAX ( 0 , seg - > number - seg - > size ) ;
i < seg - > number ; i + + ) {
avio_printf ( seg - > pb , " #EXTINF:%d, \n " , ( int ) seg - > time ) ;
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if ( seg - > entry_prefix ) {
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avio_printf ( seg - > pb , " %s " , seg - > entry_prefix ) ;
}
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ret = av_get_frame_filename ( buf , sizeof ( buf ) , s - > filename , i ) ;
if ( ret < 0 ) {
ret = AVERROR ( EINVAL ) ;
goto fail ;
}
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avio_printf ( seg - > pb , " %s \n " , buf ) ;
}
if ( last )
avio_printf ( seg - > pb , " #EXT-X-ENDLIST \n " ) ;
fail :
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ff_format_io_close ( s , & seg - > pb ) ;
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return ret ;
}
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static int segment_start ( AVFormatContext * s , int write_header )
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{
SegmentContext * c = s - > priv_data ;
AVFormatContext * oc = c - > avf ;
int err = 0 ;
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if ( write_header ) {
avformat_free_context ( oc ) ;
c - > avf = NULL ;
if ( ( err = segment_mux_init ( s ) ) < 0 )
return err ;
oc = c - > avf ;
}
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if ( c - > wrap )
c - > number % = c - > wrap ;
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if ( av_get_frame_filename ( oc - > filename , sizeof ( oc - > filename ) ,
s - > filename , c - > number + + ) < 0 )
return AVERROR ( EINVAL ) ;
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if ( ( err = s - > io_open ( s , & oc - > pb , oc - > filename , AVIO_FLAG_WRITE , NULL ) ) < 0 )
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return err ;
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if ( oc - > oformat - > priv_class & & oc - > priv_data )
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av_opt_set ( oc - > priv_data , " resend_headers " , " 1 " , 0 ) ; /* mpegts specific */
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if ( write_header ) {
if ( ( err = avformat_write_header ( oc , NULL ) ) < 0 )
return err ;
}
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return 0 ;
}
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static int segment_end ( AVFormatContext * oc , int write_trailer )
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{
int ret = 0 ;
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av_write_frame ( oc , NULL ) ; /* Flush any buffered data (fragmented mp4) */
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if ( write_trailer )
av_write_trailer ( oc ) ;
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ff_format_io_close ( oc , & oc - > pb ) ;
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return ret ;
}
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static int open_null_ctx ( AVIOContext * * ctx )
{
int buf_size = 32768 ;
uint8_t * buf = av_malloc ( buf_size ) ;
if ( ! buf )
return AVERROR ( ENOMEM ) ;
* ctx = avio_alloc_context ( buf , buf_size , AVIO_FLAG_WRITE , NULL , NULL , NULL , NULL ) ;
if ( ! * ctx ) {
av_free ( buf ) ;
return AVERROR ( ENOMEM ) ;
}
return 0 ;
}
static void close_null_ctx ( AVIOContext * pb )
{
av_free ( pb - > buffer ) ;
av_free ( pb ) ;
}
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static void seg_free_context ( SegmentContext * seg )
{
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ff_format_io_close ( seg - > avf , & seg - > pb ) ;
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avformat_free_context ( seg - > avf ) ;
seg - > avf = NULL ;
}
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static int seg_write_header ( AVFormatContext * s )
{
SegmentContext * seg = s - > priv_data ;
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AVFormatContext * oc = NULL ;
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int ret , i ;
seg - > number = 0 ;
seg - > offset_time = 0 ;
seg - > recording_time = seg - > time * 1000000 ;
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if ( ! seg - > write_header_trailer )
seg - > individual_header_trailer = 0 ;
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if ( seg - > list & & seg - > list_type ! = LIST_HLS )
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if ( ( ret = s - > io_open ( s , & seg - > pb , seg - > list , AVIO_FLAG_WRITE , NULL ) ) < 0 )
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goto fail ;
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for ( i = 0 ; i < s - > nb_streams ; i + + )
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seg - > has_video + =
lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
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( s - > streams [ i ] - > codecpar - > codec_type = = AVMEDIA_TYPE_VIDEO ) ;
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if ( seg - > has_video > 1 )
av_log ( s , AV_LOG_WARNING ,
" More than a single video stream present, "
" expect issues decoding it. \n " ) ;
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seg - > oformat = av_guess_format ( seg - > format , s - > filename , NULL ) ;
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if ( ! seg - > oformat ) {
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ret = AVERROR_MUXER_NOT_FOUND ;
goto fail ;
}
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if ( seg - > oformat - > flags & AVFMT_NOFILE ) {
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av_log ( s , AV_LOG_ERROR , " format %s not supported. \n " ,
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seg - > oformat - > name ) ;
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ret = AVERROR ( EINVAL ) ;
goto fail ;
}
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if ( ( ret = segment_mux_init ( s ) ) < 0 )
goto fail ;
oc = seg - > avf ;
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if ( av_get_frame_filename ( oc - > filename , sizeof ( oc - > filename ) ,
s - > filename , seg - > number + + ) < 0 ) {
ret = AVERROR ( EINVAL ) ;
goto fail ;
}
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if ( seg - > write_header_trailer ) {
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if ( ( ret = s - > io_open ( s , & oc - > pb , oc - > filename , AVIO_FLAG_WRITE , NULL ) ) < 0 )
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goto fail ;
} else {
if ( ( ret = open_null_ctx ( & oc - > pb ) ) < 0 )
goto fail ;
}
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if ( ( ret = avformat_write_header ( oc , NULL ) ) < 0 ) {
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ff_format_io_close ( oc , & oc - > pb ) ;
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goto fail ;
}
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if ( ! seg - > write_header_trailer ) {
close_null_ctx ( oc - > pb ) ;
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if ( ( ret = s - > io_open ( s , & oc - > pb , oc - > filename , AVIO_FLAG_WRITE , NULL ) ) < 0 )
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goto fail ;
}
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if ( seg - > list ) {
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if ( seg - > list_type = = LIST_HLS ) {
if ( ( ret = segment_hls_window ( s , 0 ) ) < 0 )
goto fail ;
} else {
avio_printf ( seg - > pb , " %s \n " , oc - > filename ) ;
avio_flush ( seg - > pb ) ;
}
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}
fail :
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if ( ret < 0 )
seg_free_context ( seg ) ;
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return ret ;
}
static int seg_write_packet ( AVFormatContext * s , AVPacket * pkt )
{
SegmentContext * seg = s - > priv_data ;
AVFormatContext * oc = seg - > avf ;
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AVStream * st = s - > streams [ pkt - > stream_index ] ;
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int64_t end_pts = seg - > recording_time * seg - > number ;
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int ret , can_split = 1 ;
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2015-01-05 09:40:41 +00:00
if ( ! oc )
return AVERROR ( EINVAL ) ;
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if ( seg - > has_video ) {
lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 18:42:52 +00:00
can_split = st - > codecpar - > codec_type = = AVMEDIA_TYPE_VIDEO & &
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pkt - > flags & AV_PKT_FLAG_KEY ;
}
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if ( can_split & & av_compare_ts ( pkt - > pts , st - > time_base , end_pts ,
AV_TIME_BASE_Q ) > = 0 ) {
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av_log ( s , AV_LOG_DEBUG , " Next segment starts at %d % " PRId64 " \n " ,
pkt - > stream_index , pkt - > pts ) ;
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ret = segment_end ( oc , seg - > individual_header_trailer ) ;
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if ( ! ret )
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ret = segment_start ( s , seg - > individual_header_trailer ) ;
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if ( ret )
goto fail ;
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oc = seg - > avf ;
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if ( seg - > list ) {
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if ( seg - > list_type = = LIST_HLS ) {
if ( ( ret = segment_hls_window ( s , 0 ) ) < 0 )
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goto fail ;
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} else {
avio_printf ( seg - > pb , " %s \n " , oc - > filename ) ;
avio_flush ( seg - > pb ) ;
if ( seg - > size & & ! ( seg - > number % seg - > size ) ) {
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ff_format_io_close ( s , & seg - > pb ) ;
if ( ( ret = s - > io_open ( s , & seg - > pb , seg - > list ,
AVIO_FLAG_WRITE , NULL ) ) < 0 )
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goto fail ;
}
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}
}
}
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ret = ff_write_chained ( oc , pkt - > stream_index , pkt , s ) ;
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fail :
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if ( ret < 0 )
seg_free_context ( seg ) ;
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return ret ;
}
static int seg_write_trailer ( struct AVFormatContext * s )
{
SegmentContext * seg = s - > priv_data ;
AVFormatContext * oc = seg - > avf ;
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int ret = 0 ;
if ( ! oc )
goto fail ;
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if ( ! seg - > write_header_trailer ) {
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if ( ( ret = segment_end ( oc , 0 ) ) < 0 )
goto fail ;
2015-06-12 12:39:16 +00:00
if ( ( ret = open_null_ctx ( & oc - > pb ) ) < 0 )
goto fail ;
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ret = av_write_trailer ( oc ) ;
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close_null_ctx ( oc - > pb ) ;
} else {
ret = segment_end ( oc , 1 ) ;
}
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if ( ret < 0 )
goto fail ;
if ( seg - > list & & seg - > list_type = = LIST_HLS ) {
if ( ( ret = segment_hls_window ( s , 1 ) < 0 ) )
goto fail ;
}
fail :
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ff_format_io_close ( s , & seg - > pb ) ;
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avformat_free_context ( oc ) ;
return ret ;
}
# define OFFSET(x) offsetof(SegmentContext, x)
# define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options [ ] = {
{ " segment_format " , " container format used for the segments " , OFFSET ( format ) , AV_OPT_TYPE_STRING , { . str = NULL } , 0 , 0 , E } ,
{ " segment_time " , " segment length in seconds " , OFFSET ( time ) , AV_OPT_TYPE_FLOAT , { . dbl = 2 } , 0 , FLT_MAX , E } ,
{ " segment_list " , " output the segment list " , OFFSET ( list ) , AV_OPT_TYPE_STRING , { . str = NULL } , 0 , 0 , E } ,
2012-08-31 10:22:31 +00:00
{ " segment_list_size " , " maximum number of playlist entries " , OFFSET ( size ) , AV_OPT_TYPE_INT , { . i64 = 5 } , 0 , INT_MAX , E } ,
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{ " segment_list_type " , " segment list format " , OFFSET ( list_type ) , AV_OPT_TYPE_INT , { . i64 = LIST_FLAT } , 0 , 2 , E , " list_type " } ,
{ " flat " , " plain list (default) " , 0 , AV_OPT_TYPE_CONST , { . i64 = LIST_FLAT } , 0 , 0 , E , " list_type " } ,
{ " hls " , " Apple HTTP Live Streaming compatible " , 0 , AV_OPT_TYPE_CONST , { . i64 = LIST_HLS } , 0 , 0 , E , " list_type " } ,
2012-08-31 10:22:31 +00:00
{ " segment_wrap " , " number after which the index wraps " , OFFSET ( wrap ) , AV_OPT_TYPE_INT , { . i64 = 0 } , 0 , INT_MAX , E } ,
2014-03-18 20:18:59 +00:00
{ " segment_list_entry_prefix " , " base url prefix for segments " , OFFSET ( entry_prefix ) , AV_OPT_TYPE_STRING , { . str = NULL } , 0 , 0 , E } ,
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{ " individual_header_trailer " , " write header/trailer to each segment " , OFFSET ( individual_header_trailer ) , AV_OPT_TYPE_INT , { . i64 = 1 } , 0 , 1 , E } ,
2012-10-02 21:59:35 +00:00
{ " write_header_trailer " , " write a header to the first segment and a trailer to the last one " , OFFSET ( write_header_trailer ) , AV_OPT_TYPE_INT , { . i64 = 1 } , 0 , 1 , E } ,
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{ NULL } ,
} ;
static const AVClass seg_class = {
. class_name = " segment muxer " ,
. item_name = av_default_item_name ,
. option = options ,
. version = LIBAVUTIL_VERSION_INT ,
} ;
AVOutputFormat ff_segment_muxer = {
. name = " segment " ,
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. long_name = NULL_IF_CONFIG_SMALL ( " segment " ) ,
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. priv_data_size = sizeof ( SegmentContext ) ,
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. flags = AVFMT_NOFILE ,
2011-10-02 21:05:29 +00:00
. write_header = seg_write_header ,
. write_packet = seg_write_packet ,
. write_trailer = seg_write_trailer ,
. priv_class = & seg_class ,
} ;