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producer_avformat.c
1413 lines (1204 loc) · 45.1 KB
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producer_avformat.c
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/*
* producer_avformat.c -- avformat producer
* Copyright (C) 2003-2004 Ushodaya Enterprises Limited
* Author: Charles Yates <charles.yates@pandora.be>
* Much code borrowed from ffmpeg.c: Copyright (c) 2000-2003 Fabrice Bellard
*
* This library 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.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// MLT Header files
#include <framework/mlt_producer.h>
#include <framework/mlt_frame.h>
// ffmpeg Header files
#include <avformat.h>
#include <opt.h>
#ifdef SWSCALE
# include <swscale.h>
#endif
#if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
# include "audioconvert.h"
#endif
// System header files
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <math.h>
void avformat_lock( );
void avformat_unlock( );
// Forward references.
static int producer_open( mlt_producer this, mlt_profile profile, char *file );
static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
/** Constructor for libavformat.
*/
mlt_producer producer_avformat_init( mlt_profile profile, char *file )
{
mlt_producer this = NULL;
// Check that we have a non-NULL argument
if ( file != NULL )
{
// Construct the producer
this = calloc( 1, sizeof( struct mlt_producer_s ) );
// Initialise it
if ( mlt_producer_init( this, NULL ) == 0 )
{
// Get the properties
mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
// Set the resource property (required for all producers)
mlt_properties_set( properties, "resource", file );
// Register our get_frame implementation
this->get_frame = producer_get_frame;
// Open the file
if ( producer_open( this, profile, file ) != 0 )
{
// Clean up
mlt_producer_close( this );
this = NULL;
}
else
{
// Close the file to release resources for large playlists - reopen later as needed
mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
mlt_properties_set_data( properties, "audio_context", NULL, 0, NULL, NULL );
mlt_properties_set_data( properties, "video_context", NULL, 0, NULL, NULL );
// Default the user-selectable indices from the auto-detected indices
mlt_properties_set_int( properties, "audio_index", mlt_properties_get_int( properties, "_audio_index" ) );
mlt_properties_set_int( properties, "video_index", mlt_properties_get_int( properties, "_video_index" ) );
}
}
}
return this;
}
/** Find the default streams.
*/
static mlt_properties find_default_streams( mlt_properties meta_media, AVFormatContext *context, int *audio_index, int *video_index )
{
int i;
char key[200];
mlt_properties_set_int( meta_media, "meta.media.nb_streams", context->nb_streams );
// Allow for multiple audio and video streams in the file and select first of each (if available)
for( i = 0; i < context->nb_streams; i++ )
{
// Get the codec context
AVStream *stream = context->streams[ i ];
if ( ! stream ) continue;
AVCodecContext *codec_context = stream->codec;
if ( ! codec_context ) continue;
AVCodec *codec = avcodec_find_decoder( codec_context->codec_id );
if ( ! codec ) continue;
snprintf( key, sizeof(key), "meta.media.%d.stream.type", i );
// Determine the type and obtain the first index of each type
switch( codec_context->codec_type )
{
case CODEC_TYPE_VIDEO:
if ( *video_index < 0 )
*video_index = i;
mlt_properties_set( meta_media, key, "video" );
snprintf( key, sizeof(key), "meta.media.%d.stream.frame_rate", i );
mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->r_frame_rate ) );
#if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
snprintf( key, sizeof(key), "meta.media.%d.stream.sample_aspect_ratio", i );
mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->sample_aspect_ratio ) );
#endif
snprintf( key, sizeof(key), "meta.media.%d.codec.pix_fmt", i );
mlt_properties_set( meta_media, key, avcodec_get_pix_fmt_name( codec_context->pix_fmt ) );
snprintf( key, sizeof(key), "meta.media.%d.codec.sample_aspect_ratio", i );
mlt_properties_set_double( meta_media, key, av_q2d( codec_context->sample_aspect_ratio ) );
break;
case CODEC_TYPE_AUDIO:
if ( *audio_index < 0 )
*audio_index = i;
mlt_properties_set( meta_media, key, "audio" );
#if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
snprintf( key, sizeof(key), "meta.media.%d.codec.sample_fmt", i );
mlt_properties_set( meta_media, key, avcodec_get_sample_fmt_name( codec_context->sample_fmt ) );
#endif
snprintf( key, sizeof(key), "meta.media.%d.codec.sample_rate", i );
mlt_properties_set_int( meta_media, key, codec_context->sample_rate );
snprintf( key, sizeof(key), "meta.media.%d.codec.channels", i );
mlt_properties_set_int( meta_media, key, codec_context->channels );
break;
default:
break;
}
// snprintf( key, sizeof(key), "meta.media.%d.stream.time_base", i );
// mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->time_base ) );
snprintf( key, sizeof(key), "meta.media.%d.codec.name", i );
mlt_properties_set( meta_media, key, codec->name );
snprintf( key, sizeof(key), "meta.media.%d.codec.long_name", i );
mlt_properties_set( meta_media, key, codec->long_name );
snprintf( key, sizeof(key), "meta.media.%d.codec.bit_rate", i );
mlt_properties_set_int( meta_media, key, codec_context->bit_rate );
// snprintf( key, sizeof(key), "meta.media.%d.codec.time_base", i );
// mlt_properties_set_double( meta_media, key, av_q2d( codec_context->time_base ) );
snprintf( key, sizeof(key), "meta.media.%d.codec.profile", i );
mlt_properties_set_int( meta_media, key, codec_context->profile );
snprintf( key, sizeof(key), "meta.media.%d.codec.level", i );
mlt_properties_set_int( meta_media, key, codec_context->level );
}
return meta_media;
}
/** Producer file destructor.
*/
static void producer_file_close( void *context )
{
if ( context != NULL )
{
// Lock the mutex now
avformat_lock( );
// Close the file
av_close_input_file( context );
// Unlock the mutex now
avformat_unlock( );
}
}
/** Producer file destructor.
*/
static void producer_codec_close( void *codec )
{
if ( codec != NULL )
{
// Lock the mutex now
avformat_lock( );
// Close the file
avcodec_close( codec );
// Unlock the mutex now
avformat_unlock( );
}
}
static inline int dv_is_pal( AVPacket *pkt )
{
return pkt->data[3] & 0x80;
}
static int dv_is_wide( AVPacket *pkt )
{
int i = 80 /* block size */ *3 /* VAUX starts at block 3 */ +3 /* skip block header */;
for ( ; i < pkt->size; i += 5 /* packet size */ )
{
if ( pkt->data[ i ] == 0x61 )
{
uint8_t x = pkt->data[ i + 2 ] & 0x7;
return ( x == 2 ) || ( x == 7 );
}
}
return 0;
}
static double get_aspect_ratio( AVStream *stream, AVCodecContext *codec_context, AVPacket *pkt )
{
double aspect_ratio = 1.0;
if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
{
if ( pkt )
{
if ( dv_is_pal( pkt ) )
{
aspect_ratio = dv_is_wide( pkt )
? 64.0/45.0 // 16:9 PAL
: 16.0/15.0; // 4:3 PAL
}
else
{
aspect_ratio = dv_is_wide( pkt )
? 32.0/27.0 // 16:9 NTSC
: 8.0/9.0; // 4:3 NTSC
}
}
else
{
AVRational ar =
#if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
stream->sample_aspect_ratio;
#else
codec_context->sample_aspect_ratio;
#endif
// Override FFmpeg's notion of DV aspect ratios, which are
// based upon a width of 704. Since we do not have a normaliser
// that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
// we just coerce the values to facilitate a passive behaviour through
// the rescale normaliser when using equivalent producers and consumers.
// = display_aspect / (width * height)
if ( ar.num == 10 && ar.den == 11 )
aspect_ratio = 8.0/9.0; // 4:3 NTSC
else if ( ar.num == 59 && ar.den == 54 )
aspect_ratio = 16.0/15.0; // 4:3 PAL
else if ( ar.num == 40 && ar.den == 33 )
aspect_ratio = 32.0/27.0; // 16:9 NTSC
else if ( ar.num == 118 && ar.den == 81 )
aspect_ratio = 64.0/45.0; // 16:9 PAL
}
}
else
{
AVRational codec_sar = codec_context->sample_aspect_ratio;
AVRational stream_sar =
#if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
stream->sample_aspect_ratio;
#else
{ 0, 1 };
#endif
if ( codec_sar.num > 0 )
aspect_ratio = av_q2d( codec_sar );
else if ( stream_sar.num > 0 )
aspect_ratio = av_q2d( stream_sar );
}
return aspect_ratio;
}
/** Open the file.
*/
static int producer_open( mlt_producer this, mlt_profile profile, char *file )
{
// Return an error code (0 == no error)
int error = 0;
// Context for avformat
AVFormatContext *context = NULL;
// Get the properties
mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
// We will treat everything with the producer fps
double fps = mlt_profile_fps( profile );
// Lock the mutex now
avformat_lock( );
// If "MRL", then create AVInputFormat
AVInputFormat *format = NULL;
AVFormatParameters *params = NULL;
char *standard = NULL;
char *mrl = strchr( file, ':' );
// AV option (0 = both, 1 = video, 2 = audio)
int av = 0;
// Setting lowest log level
av_log_set_level( -1 );
// Only if there is not a protocol specification that avformat can handle
if ( mrl && !url_exist( file ) )
{
// 'file' becomes format abbreviation
mrl[0] = 0;
// Lookup the format
format = av_find_input_format( file );
// Eat the format designator
file = ++mrl;
if ( format )
{
// Allocate params
params = calloc( sizeof( AVFormatParameters ), 1 );
// These are required by video4linux (defaults)
params->width = 640;
params->height = 480;
params->time_base= (AVRational){1,25};
// params->device = file;
params->channels = 2;
params->sample_rate = 48000;
}
// XXX: this does not work anymore since avdevice
// TODO: make producer_avddevice?
// Parse out params
mrl = strchr( file, '?' );
while ( mrl )
{
mrl[0] = 0;
char *name = strdup( ++mrl );
char *value = strchr( name, ':' );
if ( value )
{
value[0] = 0;
value++;
char *t = strchr( value, '&' );
if ( t )
t[0] = 0;
if ( !strcmp( name, "frame_rate" ) )
params->time_base.den = atoi( value );
else if ( !strcmp( name, "frame_rate_base" ) )
params->time_base.num = atoi( value );
else if ( !strcmp( name, "sample_rate" ) )
params->sample_rate = atoi( value );
else if ( !strcmp( name, "channels" ) )
params->channels = atoi( value );
else if ( !strcmp( name, "width" ) )
params->width = atoi( value );
else if ( !strcmp( name, "height" ) )
params->height = atoi( value );
else if ( !strcmp( name, "standard" ) )
{
standard = strdup( value );
params->standard = standard;
}
else if ( !strcmp( name, "av" ) )
av = atoi( value );
}
free( name );
mrl = strchr( mrl, '&' );
}
}
// Now attempt to open the file
error = av_open_input_file( &context, file, format, 0, params ) < 0;
// Cleanup AVFormatParameters
free( standard );
free( params );
// If successful, then try to get additional info
if ( error == 0 )
{
// Get the stream info
error = av_find_stream_info( context ) < 0;
// Continue if no error
if ( error == 0 )
{
// We will default to the first audio and video streams found
int audio_index = -1;
int video_index = -1;
int av_bypass = 0;
// Now set properties where we can (use default unknowns if required)
if ( context->duration != AV_NOPTS_VALUE )
{
// This isn't going to be accurate for all formats
mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
mlt_properties_set_position( properties, "out", frames - 1 );
mlt_properties_set_position( properties, "length", frames );
}
// Find default audio and video streams
find_default_streams( properties, context, &audio_index, &video_index );
if ( context->start_time != AV_NOPTS_VALUE )
mlt_properties_set_double( properties, "_start_time", context->start_time );
// Check if we're seekable (something funny about mpeg here :-/)
if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 ) && strncmp( file, "udp:", 4 ) && strncmp( file, "tcp:", 4 ) && strncmp( file, "rtsp:", 5 ) && strncmp( file, "rtp:", 4 ) )
{
mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
av_open_input_file( &context, file, NULL, 0, NULL );
av_find_stream_info( context );
}
else
av_bypass = 1;
// Store selected audio and video indexes on properties
mlt_properties_set_int( properties, "_audio_index", audio_index );
mlt_properties_set_int( properties, "_video_index", video_index );
mlt_properties_set_int( properties, "_last_position", -1 );
// Fetch the width, height and aspect ratio
if ( video_index != -1 )
{
AVCodecContext *codec_context = context->streams[ video_index ]->codec;
mlt_properties_set_int( properties, "width", codec_context->width );
mlt_properties_set_int( properties, "height", codec_context->height );
if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
{
// Fetch the first frame of DV so we can read it directly
AVPacket pkt;
int ret = 0;
while ( ret >= 0 )
{
ret = av_read_frame( context, &pkt );
if ( ret >= 0 && pkt.stream_index == video_index && pkt.size > 0 )
{
mlt_properties_set_double( properties, "aspect_ratio",
get_aspect_ratio( context->streams[ video_index ], codec_context, &pkt ) );
break;
}
}
}
else
{
mlt_properties_set_double( properties, "aspect_ratio",
get_aspect_ratio( context->streams[ video_index ], codec_context, NULL ) );
}
}
// Read Metadata
if (context->title != NULL)
mlt_properties_set(properties, "meta.attr.title.markup", context->title );
if (context->author != NULL)
mlt_properties_set(properties, "meta.attr.author.markup", context->author );
if (context->copyright != NULL)
mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
if (context->comment != NULL)
mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
if (context->album != NULL)
mlt_properties_set(properties, "meta.attr.album.markup", context->album );
if (context->year != 0)
mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
if (context->track != 0)
mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
// We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
if ( av == 0 && audio_index != -1 && video_index != -1 )
{
// We'll use the open one as our video_context
mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
// And open again for our audio context
av_open_input_file( &context, file, NULL, 0, NULL );
av_find_stream_info( context );
// Audio context
mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
}
else if ( av != 2 && video_index != -1 )
{
// We only have a video context
mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
}
else if ( audio_index != -1 )
{
// We only have an audio context
mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
}
else
{
// Something has gone wrong
error = -1;
}
mlt_properties_set_int( properties, "av_bypass", av_bypass );
}
}
// Unlock the mutex now
avformat_unlock( );
return error;
}
/** Convert a frame position to a time code.
*/
static double producer_time_of_frame( mlt_producer this, mlt_position position )
{
return ( double )position / mlt_producer_get_fps( this );
}
static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
{
#ifdef SWSCALE
if ( format == mlt_image_yuv420p )
{
struct SwsContext *context = sws_getContext( width, height, pix_fmt,
width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
AVPicture output;
output.data[0] = buffer;
output.data[1] = buffer + width * height;
output.data[2] = buffer + ( 3 * width * height ) / 2;
output.linesize[0] = width;
output.linesize[1] = width >> 1;
output.linesize[2] = width >> 1;
sws_scale( context, frame->data, frame->linesize, 0, height,
output.data, output.linesize);
sws_freeContext( context );
}
else if ( format == mlt_image_rgb24 )
{
struct SwsContext *context = sws_getContext( width, height, pix_fmt,
width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
AVPicture output;
avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
sws_scale( context, frame->data, frame->linesize, 0, height,
output.data, output.linesize);
sws_freeContext( context );
}
else
{
struct SwsContext *context = sws_getContext( width, height, pix_fmt,
width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
AVPicture output;
avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
sws_scale( context, frame->data, frame->linesize, 0, height,
output.data, output.linesize);
sws_freeContext( context );
}
#else
if ( format == mlt_image_yuv420p )
{
AVPicture pict;
pict.data[0] = buffer;
pict.data[1] = buffer + width * height;
pict.data[2] = buffer + ( 3 * width * height ) / 2;
pict.linesize[0] = width;
pict.linesize[1] = width >> 1;
pict.linesize[2] = width >> 1;
img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
}
else if ( format == mlt_image_rgb24 )
{
AVPicture output;
avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
}
else
{
AVPicture output;
avpicture_fill( &output, buffer, PIX_FMT_YUV422, width, height );
img_convert( &output, PIX_FMT_YUV422, (AVPicture *)frame, pix_fmt, width, height );
}
#endif
}
/** Allocate the image buffer and set it on the frame.
*/
static int allocate_buffer( mlt_properties frame_properties, AVCodecContext *codec_context, uint8_t **buffer, mlt_image_format *format, int *width, int *height )
{
int size = 0;
if ( codec_context->width == 0 || codec_context->height == 0 )
return size;
*width = codec_context->width;
*height = codec_context->height;
mlt_properties_set_int( frame_properties, "width", *width );
mlt_properties_set_int( frame_properties, "height", *height );
switch ( *format )
{
case mlt_image_yuv420p:
size = *width * 3 * ( *height + 1 ) / 2;
break;
case mlt_image_rgb24:
size = *width * ( *height + 1 ) * 3;
break;
default:
*format = mlt_image_yuv422;
size = *width * ( *height + 1 ) * 2;
break;
}
// Construct the output image
*buffer = mlt_pool_alloc( size );
if ( *buffer )
mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
else
size = 0;
return size;
}
/** Get an image from a frame.
*/
static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
{
// Get the properties from the frame
mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
// Obtain the frame number of this frame
mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
// Get the producer
mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
// Get the producer properties
mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
// Fetch the video_context
AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
// Get the video_index
int index = mlt_properties_get_int( properties, "video_index" );
// Obtain the expected frame numer
mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
// Get the video stream
AVStream *stream = context->streams[ index ];
// Get codec context
AVCodecContext *codec_context = stream->codec;
// Packet
AVPacket pkt;
// Get the conversion frame
AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
// Special case pause handling flag
int paused = 0;
// Special case ffwd handling
int ignore = 0;
// We may want to use the source fps if available
double source_fps = mlt_properties_get_double( properties, "source_fps" );
double fps = mlt_producer_get_fps( this );
// This is the physical frame position in the source
int req_position = ( int )( position / fps * source_fps + 0.5 );
// Get the seekable status
int seekable = mlt_properties_get_int( properties, "seekable" );
// Hopefully provide better support for streams...
int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
// Determines if we have to decode all frames in a sequence
int must_decode = 1;
// Temporary hack to improve intra frame only
must_decode = strcmp( codec_context->codec->name, "mjpeg" ) &&
strcmp( codec_context->codec->name, "rawvideo" ) &&
strcmp( codec_context->codec->name, "dvvideo" );
// Seek if necessary
if ( position != expected )
{
if ( av_frame != NULL && position + 1 == expected )
{
// We're paused - use last image
paused = 1;
}
else if ( !seekable && position > expected && ( position - expected ) < 250 )
{
// Fast forward - seeking is inefficient for small distances - just ignore following frames
ignore = ( int )( ( position - expected ) / fps * source_fps );
}
else if ( seekable && ( position < expected || position - expected >= 12 ) )
{
// Calculate the timestamp for the requested frame
int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
timestamp += context->start_time;
if ( must_decode )
timestamp -= AV_TIME_BASE;
if ( timestamp < 0 )
timestamp = 0;
// Set to the timestamp
av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
// Remove the cached info relating to the previous position
mlt_properties_set_int( properties, "_current_position", -1 );
mlt_properties_set_int( properties, "_last_position", -1 );
mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
av_frame = NULL;
}
}
// Duplicate the last image if necessary (see comment on rawvideo below)
int current_position = mlt_properties_get_int( properties, "_current_position" );
int got_picture = mlt_properties_get_int( properties, "_got_picture" );
if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
{
// Duplicate it
if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
else
mlt_frame_get_image( frame, buffer, format, width, height, writable );
}
else
{
int ret = 0;
int int_position = 0;
got_picture = 0;
av_init_packet( &pkt );
// Construct an AVFrame for YUV422 conversion
if ( av_frame == NULL )
av_frame = avcodec_alloc_frame( );
while( ret >= 0 && !got_picture )
{
// Read a packet
ret = av_read_frame( context, &pkt );
// We only deal with video from the selected video_index
if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
{
// Determine time code of the packet
int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
if ( context->start_time != AV_NOPTS_VALUE )
int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
int last_position = mlt_properties_get_int( properties, "_last_position" );
if ( int_position == last_position )
int_position = last_position + 1;
mlt_properties_set_int( properties, "_last_position", int_position );
// Decode the image
if ( must_decode || int_position >= req_position )
ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
if ( got_picture )
{
// Handle ignore
if ( int_position < req_position )
{
ignore = 0;
got_picture = 0;
}
else if ( int_position >= req_position )
{
ignore = 0;
}
else if ( ignore -- )
{
got_picture = 0;
}
}
av_free_packet( &pkt );
}
else if ( ret >= 0 )
{
av_free_packet( &pkt );
}
// Now handle the picture if we have one
if ( got_picture )
{
if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
{
convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
mlt_properties_set_int( properties, "top_field_first", av_frame->top_field_first );
mlt_properties_set_int( properties, "_current_position", int_position );
mlt_properties_set_int( properties, "_got_picture", 1 );
mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
}
else
{
got_picture = 0;
}
}
}
if ( !got_picture )
mlt_frame_get_image( frame, buffer, format, width, height, writable );
}
// Very untidy - for rawvideo, the packet contains the frame, hence the free packet
// above will break the pause behaviour - so we wipe the frame now
if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
// Set the field order property for this frame
mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
// Regardless of speed, we expect to get the next frame (cos we ain't too bright)
mlt_properties_set_position( properties, "_video_expected", position + 1 );
return 0;
}
/** Process properties as AVOptions and apply to AV context obj
*/
static void apply_properties( void *obj, mlt_properties properties, int flags )
{
int i;
int count = mlt_properties_count( properties );
for ( i = 0; i < count; i++ )
{
const char *opt_name = mlt_properties_get_name( properties, i );
const AVOption *opt = av_find_opt( obj, opt_name, NULL, flags, flags );
if ( opt != NULL )
#if LIBAVCODEC_VERSION_INT >= ((52<<16)+(7<<8)+0)
av_set_string3( obj, opt_name, mlt_properties_get( properties, opt_name), 0, NULL );
#elif LIBAVCODEC_VERSION_INT >= ((51<<16)+(59<<8)+0)
av_set_string2( obj, opt_name, mlt_properties_get( properties, opt_name), 0 );
#else
av_set_string( obj, opt_name, mlt_properties_get( properties, opt_name) );
#endif
}
}
/** Set up video handling.
*/
static void producer_set_up_video( mlt_producer this, mlt_frame frame )
{
// Get the properties
mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
// Fetch the video_context
AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
// Get the video_index
int index = mlt_properties_get_int( properties, "video_index" );
// Reopen the file if necessary
if ( !context && index > -1 )
{
mlt_events_block( properties, this );
producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
mlt_properties_get( properties, "resource" ) );
context = mlt_properties_get_data( properties, "video_context", NULL );
mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
mlt_events_unblock( properties, this );
// Process properties as AVOptions
apply_properties( context, properties, AV_OPT_FLAG_DECODING_PARAM );
}
// Exception handling for video_index
if ( context && index >= (int) context->nb_streams )
{
// Get the last video stream
for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO; --index );
mlt_properties_set_int( properties, "video_index", index );
}
if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO )
{
// Invalidate the video stream
index = -1;
mlt_properties_set_int( properties, "video_index", index );
}
// Get the frame properties
mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
if ( context && index > -1 )
{
// Get the video stream
AVStream *stream = context->streams[ index ];
// Get codec context
AVCodecContext *codec_context = stream->codec;
// Get the codec
AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
// Update the video properties if the index changed
if ( index != mlt_properties_get_int( properties, "_video_index" ) )
{
// Reset the video properties if the index changed
mlt_properties_set_int( properties, "_video_index", index );
mlt_properties_set_data( properties, "video_codec", NULL, 0, NULL, NULL );
mlt_properties_set_int( properties, "width", codec_context->width );
mlt_properties_set_int( properties, "height", codec_context->height );
// TODO: get the first usable AVPacket and reset the stream position
mlt_properties_set_double( properties, "aspect_ratio",
get_aspect_ratio( context->streams[ index ], codec_context, NULL ) );
codec = NULL;
}
// Initialise the codec if necessary
if ( codec == NULL )
{
// Initialise multi-threading
int thread_count = mlt_properties_get_int( properties, "threads" );
if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
if ( thread_count > 1 )
{
avcodec_thread_init( codec_context, thread_count );
codec_context->thread_count = thread_count;
}
// Find the codec
codec = avcodec_find_decoder( codec_context->codec_id );
// If we don't have a codec and we can't initialise it, we can't do much more...
avformat_lock( );
if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
{
// Now store the codec with its destructor
mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
}
else
{
// Remember that we can't use this later
mlt_properties_set_int( properties, "video_index", -1 );
index = -1;
}
avformat_unlock( );
// Process properties as AVOptions
apply_properties( codec_context, properties, AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
}
// No codec, no show...
if ( codec && index > -1 )
{
double source_fps = 0;
double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
double aspect_ratio = ( force_aspect_ratio > 0.0 ) ?
force_aspect_ratio : mlt_properties_get_double( properties, "aspect_ratio" );
// Determine the fps
source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
// We'll use fps if it's available
if ( source_fps > 0 )
mlt_properties_set_double( properties, "source_fps", source_fps );
else
mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
// Set the width and height
mlt_properties_set_int( frame_properties, "width", codec_context->width );
mlt_properties_set_int( frame_properties, "height", codec_context->height );
mlt_properties_set_int( frame_properties, "real_width", codec_context->width );
mlt_properties_set_int( frame_properties, "real_height", codec_context->height );
mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
mlt_frame_push_get_image( frame, producer_get_image );
mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
}
else
{