git.sesse.net Git - vlc/blob - modules/packetizer/mpeg4audio.c

   1 /*****************************************************************************
   2  * mpeg4audio.c
   3  *****************************************************************************
   4  * Copyright (C) 2001, 2002 VideoLAN
   5  * $Id: mpeg4audio.c,v 1.1 2003/01/08 10:26:49 fenrir Exp $
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  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 General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc/aout.h>
  29 #include <vlc/decoder.h>
  30 #include <vlc/input.h>
  31 #include <vlc/sout.h>
  32 #include "codecs.h"
  33 #include <stdlib.h>                                      /* malloc(), free() */
  34 #include <string.h>                                              /* strdup() */
  35
  36 /*****************************************************************************
  37  * Local prototypes
  38  *****************************************************************************/
  39
  40 /* AAC Config in ES:
  41  *
  42  * AudioObjectType          5 bits
  43  * samplingFrequencyIndex   4 bits
  44  * if (samplingFrequencyIndex == 0xF)
  45  *  samplingFrequency   24 bits
  46  * channelConfiguration     4 bits
  47  * GA_SpecificConfig
  48  *  FrameLengthFlag         1 bit 1024 or 960
  49  *  DependsOnCoreCoder      1 bit (always 0)
  50  *  ExtensionFlag           1 bit (always 0)
  51  */
  52
  53 typedef struct packetizer_thread_s
  54 {
  55     /* Input properties */
  56     int                     b_adts;
  57
  58     decoder_fifo_t          *p_fifo;
  59     bit_stream_t            bit_stream;
  60
  61     /* Output properties */
  62     sout_input_t            *p_sout_input;
  63     sout_packet_format_t    output_format;
  64
  65     mtime_t                 i_pts_start;
  66     mtime_t                 i_pts;
  67
  68     WAVEFORMATEX            *p_wf;
  69
  70     /* Extracted from AAC config */
  71     int                     i_sample_rate;
  72     int                     i_frame_size;   // 1024 or 960
  73
  74 } packetizer_thread_t;
  75
  76 static int  Open    ( vlc_object_t * );
  77 static int  Run     ( decoder_fifo_t * );
  78
  79 static int  InitThread           ( packetizer_thread_t * );
  80 static void PacketizeThreadMPEG4 ( packetizer_thread_t * );
  81 static void PacketizeThreadADTS  ( packetizer_thread_t * );
  82 static void EndThread            ( packetizer_thread_t * );
  83
  84 /*****************************************************************************
  85  * Module descriptor
  86  *****************************************************************************/
  87
  88 vlc_module_begin();
  89     set_description( _("MPEG4 Audio packetizer") );
  90     set_capability( "packetizer", 50 );
  91     set_callbacks( Open, NULL );
  92 vlc_module_end();
  93
  94
  95 /*****************************************************************************
  96  * OpenDecoder: probe the packetizer and return score
  97  *****************************************************************************
  98  * Tries to launch a decoder and return score so that the interface is able
  99  * to choose.
 100  *****************************************************************************/
 101 static int Open( vlc_object_t *p_this )
 102 {
 103     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
 104
 105     p_fifo->pf_run = Run;
 106
 107     if( p_fifo->i_fourcc == VLC_FOURCC( 'm', 'p', '4', 'a') )
 108     {
 109         return( VLC_SUCCESS );
 110     }
 111     else
 112     {
 113         return( VLC_EGENERIC );
 114     }
 115 }
 116
 117 /*****************************************************************************
 118  * RunDecoder: this function is called just after the thread is created
 119  *****************************************************************************/
 120 static int Run( decoder_fifo_t *p_fifo )
 121 {
 122     packetizer_thread_t *p_pack;
 123     int b_error;
 124
 125     msg_Info( p_fifo, "Running MPEG4 audio packetizer" );
 126     if( !( p_pack = malloc( sizeof( packetizer_thread_t ) ) ) )
 127     {
 128         msg_Err( p_fifo, "out of memory" );
 129         DecoderError( p_fifo );
 130         return( -1 );
 131     }
 132     memset( p_pack, 0, sizeof( packetizer_thread_t ) );
 133
 134     p_pack->p_fifo = p_fifo;
 135
 136     if( InitThread( p_pack ) != 0 )
 137     {
 138         DecoderError( p_fifo );
 139         return( -1 );
 140     }
 141
 142     while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) )
 143     {
 144         if( p_pack->b_adts )
 145         {
 146             PacketizeThreadADTS( p_pack );
 147         }
 148         else
 149         {
 150             PacketizeThreadMPEG4( p_pack );
 151         }
 152     }
 153
 154
 155     if( ( b_error = p_pack->p_fifo->b_error ) )
 156     {
 157         DecoderError( p_pack->p_fifo );
 158     }
 159
 160     EndThread( p_pack );
 161     if( b_error )
 162     {
 163         return( -1 );
 164     }
 165
 166     return( 0 );
 167 }
 168
 169
 170 #define FREE( p ) if( p ) free( p ); p = NULL
 171
 172 /*****************************************************************************
 173  * InitThread: initialize data before entering main loop
 174  *****************************************************************************/
 175 static int i_sample_rates[] =
 176 {
 177     96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
 178     16000, 12000, 11025, 8000,  7350,  0,     0,     0
 179 };
 180
 181 static int InitThread( packetizer_thread_t *p_pack )
 182 {
 183     WAVEFORMATEX    *p_wf;
 184
 185     p_wf = (WAVEFORMATEX*)p_pack->p_fifo->p_waveformatex;
 186
 187     if( p_wf && p_wf->cbSize > 0)
 188     {
 189         uint8_t *p_config = (uint8_t*)&p_wf[1];
 190         int i_wf = sizeof( WAVEFORMATEX ) + p_wf->cbSize;
 191         int i_index;
 192
 193
 194         p_pack->p_wf = malloc( i_wf );
 195         memcpy( p_pack->p_wf,
 196                 p_wf,
 197                 i_wf );
 198         p_pack->output_format.i_cat = AUDIO_ES;
 199         p_pack->output_format.i_fourcc = VLC_FOURCC( 'm', 'p', '4', 'a' );
 200         p_pack->output_format.p_format = p_pack->p_wf;
 201         p_pack->b_adts = 0;
 202
 203         i_index = ( ( p_config[0] << 1 ) | ( p_config[1] >> 7 ) )&0x0f;
 204         if( i_index != 0x0f )
 205         {
 206             p_pack->i_sample_rate = i_sample_rates[i_index];
 207             p_pack->i_frame_size  = ( ( p_config[1] >> 2 )&0x01 ) ? 960 : 1024;
 208         }
 209         else
 210         {
 211             p_pack->i_sample_rate = ( ( p_config[1]&0x7f ) << 17 ) | ( p_config[2] << 9 )|
 212                                       ( p_config[3] << 1 ) | ( p_config[4] >> 7 );
 213             p_pack->i_frame_size  = ( ( p_config[4] >> 2 )&0x01 ) ? 960 : 1024;
 214         }
 215         msg_Dbg( p_pack->p_fifo,
 216                  "aac %dHz %d samples/frame",
 217                  p_pack->i_sample_rate,
 218                  p_pack->i_frame_size );
 219     }
 220     else
 221     {
 222         int i_wf = sizeof( WAVEFORMATEX ) + 5;
 223         /* we will try to create a AAC Config from adts */
 224         p_pack->output_format.i_cat = UNKNOWN_ES;
 225         p_pack->output_format.i_fourcc = VLC_FOURCC( 'n', 'u', 'l', 'l' );
 226         p_pack->b_adts = 1;
 227
 228         if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
 229                NULL, NULL ) != VLC_SUCCESS )
 230         {
 231             msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
 232             return -1;
 233         }
 234
 235     }
 236
 237     p_pack->p_sout_input =
 238         sout_InputNew( p_pack->p_fifo,
 239                        &p_pack->output_format );
 240
 241     if( !p_pack->p_sout_input )
 242     {
 243         msg_Err( p_pack->p_fifo,
 244                  "cannot add a new stream" );
 245         return( -1 );
 246     }
 247
 248     p_pack->i_pts_start = -1;
 249     p_pack->i_pts = 0;
 250     return( 0 );
 251 }
 252
 253 /*****************************************************************************
 254  * PacketizeThread: packetize an unit (here copy a complete pes)
 255  *****************************************************************************/
 256 static void PacketizeThreadMPEG4( packetizer_thread_t *p_pack )
 257 {
 258     sout_buffer_t   *p_sout_buffer;
 259     pes_packet_t    *p_pes;
 260     size_t          i_size;
 261
 262     /* **** get samples count **** */
 263     input_ExtractPES( p_pack->p_fifo, &p_pes );
 264     if( !p_pes )
 265     {
 266         p_pack->p_fifo->b_error = 1;
 267         return;
 268     }
 269 #if 0
 270     if( p_pack->i_pts_start < 0 && p_pes->i_pts > 0 )
 271     {
 272         p_pack->i_pts_start = p_pes->i_pts;
 273     }
 274     p_pack->i_pts = p_pes->i_pts - p_pack->i_pts_start;
 275 #endif
 276
 277     i_size = p_pes->i_pes_size;
 278
 279     if( i_size > 0 )
 280     {
 281         data_packet_t   *p_data;
 282         size_t          i_buffer;
 283
 284         p_sout_buffer =
 285             sout_BufferNew( p_pack->p_sout_input->p_sout, i_size );
 286         if( !p_sout_buffer )
 287         {
 288             p_pack->p_fifo->b_error = 1;
 289             return;
 290         }
 291         /* TODO: memcpy of the pes packet */
 292         for( i_buffer = 0, p_data = p_pes->p_first;
 293              p_data != NULL && i_buffer < i_size;
 294              p_data = p_data->p_next)
 295         {
 296             size_t          i_copy;
 297
 298             i_copy = __MIN( p_data->p_payload_end - p_data->p_payload_start,
 299                             i_size - i_buffer );
 300             if( i_copy > 0 )
 301             {
 302                 p_pack->p_fifo->p_vlc->pf_memcpy( p_sout_buffer->p_buffer + i_buffer,
 303                                                   p_data->p_payload_start,
 304                                                   i_copy );
 305             }
 306             i_buffer += i_copy;
 307         }
 308
 309         p_sout_buffer->i_length = (mtime_t)1000000 * (mtime_t)p_pack->i_frame_size / (mtime_t)p_pack->i_sample_rate;
 310         p_sout_buffer->i_bitrate = 0;
 311         p_sout_buffer->i_dts = p_pack->i_pts;
 312         p_sout_buffer->i_pts = p_pack->i_pts;
 313
 314         sout_InputSendBuffer( p_pack->p_sout_input,
 315                                p_sout_buffer );
 316
 317         p_pack->i_pts += (mtime_t)1000000 * (mtime_t)p_pack->i_frame_size / (mtime_t)p_pack->i_sample_rate;
 318     }
 319
 320     input_DeletePES( p_pack->p_fifo->p_packets_mgt, p_pes );
 321 }
 322
 323
 324 static void PacketizeThreadADTS( packetizer_thread_t *p_pack )
 325 {
 326     msg_Err( p_pack->p_fifo, "adts stream unsupported" );
 327     p_pack->p_fifo->b_error = 1;
 328 }
 329
 330 /*****************************************************************************
 331  * EndThread : packetizer thread destruction
 332  *****************************************************************************/
 333 static void EndThread ( packetizer_thread_t *p_pack)
 334 {
 335     if( p_pack->p_sout_input )
 336     {
 337         sout_InputDelete( p_pack->p_sout_input );
 338     }
 339     if( p_pack->p_wf )
 340     {
 341         free( p_pack->p_wf );
 342     }
 343 }
 344