research.m1stereo.tv/gitweb/ - melted/blob - src/modules/ffmpeg/producer_ffmpeg.c

   1 /*
   2  * producer_ffmpeg.c -- simple ffmpeg test case
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "producer_ffmpeg.h"
  22 #include <framework/mlt_frame.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 typedef struct producer_ffmpeg_s *producer_ffmpeg;
  27
  28 struct producer_ffmpeg_s
  29 {
  30         struct mlt_producer_s parent;
  31         char *command;
  32         FILE *video;
  33         FILE *audio;
  34         uint64_t expected;
  35         uint8_t *buffer;
  36         int open;
  37         int width;
  38         int height;
  39 };
  40
  41 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index );
  42 static void producer_close( mlt_producer parent );
  43
  44 mlt_producer producer_ffmpeg_init( char *command )
  45 {
  46         producer_ffmpeg this = calloc( sizeof( struct producer_ffmpeg_s ), 1 );
  47         if ( this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
  48         {
  49                 mlt_producer producer = &this->parent;
  50
  51                 producer->get_frame = producer_get_frame;
  52                 producer->close = producer_close;
  53
  54                 if ( command != NULL )
  55                         this->command = strdup( command );
  56
  57                 this->buffer = malloc( 1024 * 1024 );
  58
  59                 return producer;
  60         }
  61         free( this );
  62         return NULL;
  63 }
  64
  65 static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
  66 {
  67         // Get the frames properties
  68         mlt_properties properties = mlt_frame_properties( this );
  69
  70         if ( mlt_properties_get_int( properties, "has_image" ) )
  71         {
  72                 // Get width and height
  73                 *format = mlt_image_yuv422;
  74                 *width = mlt_properties_get_int( properties, "width" );
  75                 *height = mlt_properties_get_int( properties, "height" );
  76
  77                 // Specify format and image
  78                 *buffer = mlt_properties_get_data( properties, "image", NULL );
  79         }
  80         else
  81         {
  82                 mlt_frame_get_image( this, buffer, format, width, height, writable );
  83         }
  84
  85         return 0;
  86 }
  87
  88 FILE *producer_ffmpeg_run_video( producer_ffmpeg this )
  89 {
  90         if ( this->video == NULL && !this->open )
  91         {
  92                 if ( this->command != NULL )
  93                 {
  94                         char command[ 1024 ];
  95                         float fps = mlt_producer_get_fps( &this->parent );
  96                         float position = mlt_producer_position( &this->parent );
  97                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f imagepipe -r %f -f yuv4mpegpipe - 2>/dev/null", this->command, position, fps );
  98                         this->video = popen( command, "r" );
  99                 }
 100         }
 101         return this->video;
 102 }
 103
 104 FILE *producer_ffmpeg_run_audio( producer_ffmpeg this )
 105 {
 106         if ( this->audio == NULL && !this->open )
 107         {
 108                 if ( this->command != NULL )
 109                 {
 110                         char command[ 1024 ];
 111                         float position = mlt_producer_position( &this->parent );
 112                         sprintf( command, "ffmpeg -i \"%s\" -ss %f -f s16le -ar 48000 -ac 2 - 2>/dev/null", this->command, position );
 113                         this->audio = popen( command, "r" );
 114                 }
 115         }
 116         return this->audio;
 117 }
 118
 119 static void producer_ffmpeg_position( producer_ffmpeg this, uint64_t requested )
 120 {
 121         if ( requested != this->expected )
 122         {
 123                 if ( this->video != NULL )
 124                         pclose( this->video );
 125                 this->video = NULL;
 126                 if ( this->audio != NULL )
 127                         pclose( this->audio );
 128                 this->audio = NULL;
 129
 130                 // We should not be open now
 131                 this->open = 0;
 132         }
 133
 134         // This is the next frame we expect
 135         this->expected = mlt_producer_frame( &this->parent ) + 1;
 136
 137         // Open the pipe
 138         this->video = producer_ffmpeg_run_video( this );
 139
 140         // Open the audio pipe
 141         this->audio = producer_ffmpeg_run_audio( this );
 142
 143         // We should be open now
 144         this->open = 1;
 145 }
 146
 147 static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
 148 {
 149         // Get the frames properties
 150         mlt_properties properties = mlt_frame_properties( this );
 151
 152         producer_ffmpeg producer = mlt_properties_get_data( properties, "producer_ffmpeg", NULL );
 153
 154         *frequency = 48000;
 155         *channels = 2;
 156         *samples = 1920;
 157
 158         // Size
 159         int size = *samples * *channels * 2;
 160
 161         // Allocate an image
 162         *buffer = malloc( size );
 163
 164         // Read it
 165         if ( producer->audio != NULL )
 166         {
 167                 if ( fread( *buffer, size, 1, producer->audio ) != 1 )
 168                 {
 169                         pclose( producer->audio );
 170                         producer->audio = NULL;
 171                 }
 172         }
 173         else
 174         {
 175                 memset( *buffer, 0, size );
 176         }
 177
 178         // Pass the data on the frame properties
 179         mlt_properties_set_data( properties, "audio", *buffer, size, free, NULL );
 180
 181         return 0;
 182 }
 183
 184 static int read_ffmpeg_header( producer_ffmpeg this, int *width, int *height )
 185 {
 186         int count = 0;
 187         char temp[ 132 ];
 188         FILE *video = this->video;
 189
 190         if ( fgets( temp, 132, video ) )
 191         {
 192                 if ( strncmp( temp, "FRAME", 5 ) )
 193                 {
 194                         if ( strstr( temp, " W" ) != NULL )
 195                                 *width = atoi( strstr( temp, " W" ) + 2 );
 196                         if ( strstr( temp, " H" ) != NULL )
 197                                 *height = atoi( strstr( temp, " H" ) + 2 );
 198                         count = 2;
 199                         fgets( temp, 132, video );
 200                         this->width = *width;
 201                         this->height = *height;
 202                 }
 203                 else
 204                 {
 205                         *width = this->width;
 206                         *height = this->height;
 207                         count = 2;
 208                 }
 209         }
 210         return count;
 211 }
 212
 213 static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
 214 {
 215         producer_ffmpeg this = producer->child;
 216         int width;
 217         int height;
 218
 219         // Construct a test frame
 220         *frame = mlt_frame_init( );
 221
 222         // Are we at the position expected?
 223         producer_ffmpeg_position( this, mlt_producer_frame( producer ) );
 224
 225         // Get the frames properties
 226         mlt_properties properties = mlt_frame_properties( *frame );
 227
 228         FILE *video = this->video;
 229
 230         // Read the video
 231         if ( video != NULL && read_ffmpeg_header( this, &width, &height ) == 2 )
 232         {
 233                 // Allocate an image
 234                 uint8_t *image = malloc( width * height * 2 );
 235
 236                 // Read it
 237                 fread( this->buffer, width * height * 3 / 2, 1, video );
 238
 239                 // Convert it
 240                 mlt_convert_yuv420p_to_yuv422( this->buffer, width, height, width, image );
 241
 242                 // Pass the data on the frame properties
 243                 mlt_properties_set_data( properties, "image", image, width * height * 2, free, NULL );
 244                 mlt_properties_set_int( properties, "width", width );
 245                 mlt_properties_set_int( properties, "height", height );
 246                 mlt_properties_set_int( properties, "has_image", 1 );
 247
 248                 // Push the image callback
 249                 mlt_frame_push_get_image( *frame, producer_get_image );
 250         }
 251         else
 252         {
 253                 // Clean up
 254                 if ( this->video != NULL )
 255                 {
 256                         pclose( this->video );
 257                         this->video = NULL;
 258                 }
 259
 260                 // Push the image callback
 261                 mlt_frame_push_get_image( *frame, producer_get_image );
 262         }
 263
 264         // Set the audio pipe
 265         mlt_properties_set_data( properties, "producer_ffmpeg", this, 0, NULL, NULL );
 266
 267         // Hmm - register audio callback
 268         ( *frame )->get_audio = producer_get_audio;
 269
 270         // Update timecode on the frame we're creating
 271         mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );
 272
 273         // Calculate the next timecode
 274         mlt_producer_prepare_next( producer );
 275
 276         return 0;
 277 }
 278
 279 static void producer_close( mlt_producer parent )
 280 {
 281         producer_ffmpeg this = parent->child;
 282         if ( this->video )
 283                 pclose( this->video );
 284         if ( this->audio )
 285                 pclose( this->audio );
 286         free( this->command );
 287         parent->close = NULL;
 288         mlt_producer_close( parent );
 289         free( this );
 290 }
 291