1 /*****************************************************************************
2 * mux.c: muxer using libavformat
3 *****************************************************************************
4 * Copyright (C) 2006 VLC authors and VideoLAN
7 * Authors: Gildas Bazin <gbazin@videolan.org>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_block.h>
36 #include <libavformat/avformat.h>
39 #include "../../codec/avcodec/avcodec.h"
40 #include "../../codec/avcodec/avcommon.h"
43 //#define AVFORMAT_DEBUG 1
45 static const char *const ppsz_mux_options[] = {
46 "mux", "options", NULL
49 /*****************************************************************************
50 * mux_sys_t: mux descriptor
51 *****************************************************************************/
63 int64_t i_initial_dts;
66 /*****************************************************************************
68 *****************************************************************************/
69 static int Control ( sout_mux_t *, int, va_list );
70 static int AddStream( sout_mux_t *, sout_input_t * );
71 static int DelStream( sout_mux_t *, sout_input_t * );
72 static int Mux ( sout_mux_t * );
74 static int IOWrite( void *opaque, uint8_t *buf, int buf_size );
75 static int64_t IOSeek( void *opaque, int64_t offset, int whence );
77 /*****************************************************************************
79 *****************************************************************************/
80 int OpenMux( vlc_object_t *p_this )
82 AVOutputFormat *file_oformat;
83 sout_mux_t *p_mux = (sout_mux_t*)p_this;
84 sout_mux_sys_t *p_sys;
89 config_ChainParse( p_mux, "sout-avformat-", ppsz_mux_options, p_mux->p_cfg );
91 /* Find the requested muxer */
92 psz_mux = var_GetNonEmptyString( p_mux, "sout-avformat-mux" );
95 file_oformat = av_guess_format( psz_mux, NULL, NULL );
101 av_guess_format( NULL, p_mux->p_access->psz_path, NULL);
105 msg_Err( p_mux, "unable for find a suitable output format" );
109 /* Fill p_mux fields */
110 p_mux->pf_control = Control;
111 p_mux->pf_addstream = AddStream;
112 p_mux->pf_delstream = DelStream;
114 p_mux->p_sys = p_sys = malloc( sizeof( sout_mux_sys_t ) );
118 p_sys->oc = avformat_alloc_context();
119 p_sys->oc->oformat = file_oformat;
120 /* If we use dummy access, let avformat write output */
121 if( !strcmp( p_mux->p_access->psz_access, "dummy") )
122 strcpy( p_sys->oc->filename, p_mux->p_access->psz_path );
124 /* Create I/O wrapper */
125 p_sys->io_buffer_size = 32768; /* FIXME */
126 p_sys->io_buffer = malloc( p_sys->io_buffer_size );
128 p_sys->io = avio_alloc_context(
129 p_sys->io_buffer, p_sys->io_buffer_size,
130 1, p_mux, NULL, IOWrite, IOSeek );
132 p_sys->oc->pb = p_sys->io;
133 p_sys->oc->nb_streams = 0;
135 p_sys->b_write_header = true;
136 p_sys->b_error = false;
137 p_sys->i_initial_dts = 0;
142 /*****************************************************************************
144 *****************************************************************************/
145 void CloseMux( vlc_object_t *p_this )
147 sout_mux_t *p_mux = (sout_mux_t*)p_this;
148 sout_mux_sys_t *p_sys = p_mux->p_sys;
150 if( !p_sys->b_write_header && !p_sys->b_error && av_write_trailer( p_sys->oc ) < 0 )
152 msg_Err( p_mux, "could not write trailer" );
155 avformat_free_context(p_sys->oc);
157 free( p_sys->io_buffer );
161 /*****************************************************************************
163 *****************************************************************************/
164 static int AddStream( sout_mux_t *p_mux, sout_input_t *p_input )
166 sout_mux_sys_t *p_sys = p_mux->p_sys;
167 AVCodecContext *codec;
171 msg_Dbg( p_mux, "adding input" );
173 if( !GetFfmpegCodec( p_input->p_fmt->i_codec, 0, &i_codec_id, 0 ) )
175 msg_Dbg( p_mux, "couldn't find codec for fourcc '%4.4s'",
176 (char *)&p_input->p_fmt->i_codec );
180 p_input->p_sys = malloc( sizeof( int ) );
181 *((int *)p_input->p_sys) = p_sys->oc->nb_streams;
183 if( p_input->p_fmt->i_cat != VIDEO_ES && p_input->p_fmt->i_cat != AUDIO_ES)
185 msg_Warn( p_mux, "Unhandled ES category" );
189 stream = avformat_new_stream( p_sys->oc, NULL);
192 free( p_input->p_sys );
195 codec = stream->codec;
197 codec->opaque = p_mux;
199 switch( p_input->p_fmt->i_cat )
202 codec->codec_type = AVMEDIA_TYPE_AUDIO;
203 codec->channels = p_input->p_fmt->audio.i_channels;
204 codec->sample_rate = p_input->p_fmt->audio.i_rate;
205 codec->time_base = (AVRational){1, codec->sample_rate};
206 codec->frame_size = p_input->p_fmt->audio.i_frame_length;
210 if( !p_input->p_fmt->video.i_frame_rate ||
211 !p_input->p_fmt->video.i_frame_rate_base )
213 msg_Warn( p_mux, "Missing frame rate, assuming 25fps" );
214 p_input->p_fmt->video.i_frame_rate = 25;
215 p_input->p_fmt->video.i_frame_rate_base = 1;
217 codec->codec_type = AVMEDIA_TYPE_VIDEO;
218 codec->width = p_input->p_fmt->video.i_width;
219 codec->height = p_input->p_fmt->video.i_height;
220 av_reduce( &codec->sample_aspect_ratio.num,
221 &codec->sample_aspect_ratio.den,
222 p_input->p_fmt->video.i_sar_num,
223 p_input->p_fmt->video.i_sar_den, 1 << 30 /* something big */ );
224 stream->sample_aspect_ratio.num = codec->sample_aspect_ratio.num;
225 codec->time_base.den = p_input->p_fmt->video.i_frame_rate;
226 codec->time_base.num = p_input->p_fmt->video.i_frame_rate_base;
231 codec->bit_rate = p_input->p_fmt->i_bitrate;
232 codec->codec_tag = av_codec_get_tag( p_sys->oc->oformat->codec_tag, i_codec_id );
233 if( !codec->codec_tag && i_codec_id == CODEC_ID_MP2 )
235 i_codec_id = CODEC_ID_MP3;
236 codec->codec_tag = av_codec_get_tag( p_sys->oc->oformat->codec_tag, i_codec_id );
238 codec->codec_id = i_codec_id;
240 if( p_input->p_fmt->i_extra )
242 codec->extradata_size = p_input->p_fmt->i_extra;
243 codec->extradata = av_malloc( p_input->p_fmt->i_extra );
244 memcpy( codec->extradata, p_input->p_fmt->p_extra,
245 p_input->p_fmt->i_extra );
251 /*****************************************************************************
253 *****************************************************************************/
254 static int DelStream( sout_mux_t *p_mux, sout_input_t *p_input )
256 msg_Dbg( p_mux, "removing input" );
257 free( p_input->p_sys );
261 static int MuxBlock( sout_mux_t *p_mux, sout_input_t *p_input )
263 sout_mux_sys_t *p_sys = p_mux->p_sys;
264 block_t *p_data = block_FifoGet( p_input->p_fifo );
265 int i_stream = *((int *)p_input->p_sys);
266 AVStream *p_stream = p_sys->oc->streams[i_stream];
269 memset( &pkt, 0, sizeof(AVPacket) );
271 av_init_packet(&pkt);
272 pkt.data = p_data->p_buffer;
273 pkt.size = p_data->i_buffer;
274 pkt.stream_index = i_stream;
276 if( p_data->i_flags & BLOCK_FLAG_TYPE_I ) pkt.flags |= AV_PKT_FLAG_KEY;
278 /* avformat expects pts/dts which start from 0 */
279 p_data->i_dts -= p_mux->p_sys->i_initial_dts;
280 p_data->i_pts -= p_mux->p_sys->i_initial_dts;
282 if( p_data->i_pts > 0 )
283 pkt.pts = p_data->i_pts * p_stream->time_base.den /
284 INT64_C(1000000) / p_stream->time_base.num;
285 if( p_data->i_dts > 0 )
286 pkt.dts = p_data->i_dts * p_stream->time_base.den /
287 INT64_C(1000000) / p_stream->time_base.num;
289 /* this is another hack to prevent libavformat from triggering the "non monotone timestamps" check in avformat/utils.c */
290 p_stream->cur_dts = ( p_data->i_dts * p_stream->time_base.den /
291 INT64_C(1000000) / p_stream->time_base.num ) - 1;
293 if( av_write_frame( p_sys->oc, &pkt ) < 0 )
295 msg_Err( p_mux, "could not write frame (pts: %"PRId64", dts: %"PRId64") "
296 "(pkt pts: %"PRId64", dts: %"PRId64")",
297 p_data->i_pts, p_data->i_dts, pkt.pts, pkt.dts );
298 block_Release( p_data );
302 block_Release( p_data );
306 /*****************************************************************************
307 * Mux: multiplex available data in input fifos
308 *****************************************************************************/
309 static int Mux( sout_mux_t *p_mux )
311 sout_mux_sys_t *p_sys = p_mux->p_sys;
313 if( p_sys->b_error ) return VLC_EGENERIC;
315 if( p_sys->b_write_header )
318 msg_Dbg( p_mux, "writing header" );
320 char *psz_opts = var_GetNonEmptyString( p_mux, "sout-avformat-options" );
321 AVDictionary *options = NULL;
322 if (psz_opts && *psz_opts)
323 options = vlc_av_get_options(psz_opts);
325 error = avformat_write_header( p_sys->oc, options ? &options : NULL);
326 AVDictionaryEntry *t = NULL;
327 while ((t = av_dict_get(options, "", t, AV_DICT_IGNORE_SUFFIX))) {
328 msg_Err( p_mux, "Unknown option \"%s\"", t->key );
330 av_dict_free(&options);
333 errno = AVUNERROR(error);
334 msg_Err( p_mux, "could not write header: %m" );
335 p_sys->b_write_header = false;
336 p_sys->b_error = true;
340 avio_flush( p_sys->oc->pb );
341 p_sys->b_write_header = false;
348 int i_stream = sout_MuxGetStream( p_mux, 1, &i_dts );
352 if( !p_mux->p_sys->i_initial_dts )
353 p_mux->p_sys->i_initial_dts = i_dts;
355 MuxBlock( p_mux, p_mux->pp_inputs[i_stream] );
361 /*****************************************************************************
363 *****************************************************************************/
364 static int Control( sout_mux_t *p_mux, int i_query, va_list args )
370 case MUX_CAN_ADD_STREAM_WHILE_MUXING:
371 pb_bool = (bool*)va_arg( args, bool * );
375 case MUX_GET_ADD_STREAM_WAIT:
376 pb_bool = (bool*)va_arg( args, bool * );
382 char **ppsz = (char**)va_arg( args, char ** );
383 *ppsz = strdup( p_mux->p_sys->oc->oformat->mime_type );
392 /*****************************************************************************
393 * I/O wrappers for libavformat
394 *****************************************************************************/
395 static int IOWrite( void *opaque, uint8_t *buf, int buf_size )
397 sout_mux_t *p_mux = opaque;
400 #ifdef AVFORMAT_DEBUG
401 msg_Dbg( p_mux, "IOWrite %i bytes", buf_size );
404 block_t *p_buf = block_New( p_mux->p_sout, buf_size );
405 if( buf_size > 0 ) memcpy( p_buf->p_buffer, buf, buf_size );
407 if( p_mux->p_sys->b_write_header )
408 p_buf->i_flags |= BLOCK_FLAG_HEADER;
410 i_ret = sout_AccessOutWrite( p_mux->p_access, p_buf );
411 return i_ret ? i_ret : -1;
414 static int64_t IOSeek( void *opaque, int64_t offset, int whence )
416 sout_mux_t *p_mux = opaque;
418 #ifdef AVFORMAT_DEBUG
419 msg_Dbg( p_mux, "IOSeek offset: %"PRId64", whence: %i", offset, whence );
425 return sout_AccessOutSeek( p_mux->p_access, offset );