1 /***************************************************************************
4 Functions that are called by libmad to communicate with vlc decoder
8 copyright : (C) 2001 by Jean-Paul Saman
10 ***************************************************************************/
12 /***************************************************************************
14 * This program is free software; you can redistribute it and/or modify *
15 * it under the terms of the GNU General Public License as published by *
16 * the Free Software Foundation; either version 2 of the License, or *
17 * (at your option) any later version. *
19 ***************************************************************************/
21 /*****************************************************************************
23 *****************************************************************************/
24 #include <stdlib.h> /* malloc(), free() */
25 #include <string.h> /* strdup() */
29 #include <vlc/decoder.h>
31 /*****************************************************************************
32 * Libmad includes files
33 *****************************************************************************/
38 static void PrintFrameInfo(struct mad_header *Header);
40 /*****************************************************************************
41 * libmad_input: this function is called by libmad when the input buffer needs
43 *****************************************************************************/
44 enum mad_flow libmad_input( void *p_data, struct mad_stream *p_stream )
46 mad_adec_thread_t * p_dec = (mad_adec_thread_t *) p_data;
47 size_t i_wanted, i_left;
49 if ( p_dec->p_fifo->b_die )
51 msg_Dbg( p_dec->p_fifo, "stopping libmad decoder" );
55 if ( p_dec->p_fifo->b_error )
57 msg_Warn( p_dec->p_fifo, "ignoring current audio frame" );
58 return MAD_FLOW_IGNORE;
61 /* libmad_stream_buffer does not consume the total buffer, it consumes
62 * only data for one frame only. So all data left in the buffer should
63 * be put back in front. */
64 if ( !p_stream->buffer || p_stream->error == MAD_ERROR_BUFLEN )
66 /* libmad does not consume all the buffer it's given. Some data,
67 * part of a truncated frame, is left unused at the end of the
68 * buffer. Those datas must be put back at the beginning of the
69 * buffer and taken in account for refilling the buffer. This
70 * means that the input buffer must be large enough to hold a
71 * complete frame at the highest observable bit-rate (currently
72 * 448 kb/s). XXX=XXX Is 2016 bytes the size of the largest frame?
73 * (448000*(1152/32000))/8 */
74 if( p_stream->next_frame )
76 i_left = p_stream->bufend - p_stream->next_frame;
77 if( p_dec->buffer != p_stream->next_frame )
79 memcpy( p_dec->buffer, p_stream->next_frame, i_left );
81 i_wanted = MAD_BUFFER_MDLEN - i_left;
83 /* Store timestamp for next frame */
84 p_dec->i_next_pts = p_dec->p_fifo->p_first->i_pts;
88 i_wanted = MAD_BUFFER_MDLEN;
91 /* Store timestamp for this frame */
92 p_dec->i_current_pts = p_dec->p_fifo->p_first->i_pts;
95 /* Fill-in the buffer. If an error occurs print a message and leave
96 * the decoding loop. If the end of stream is reached we also leave
97 * the loop but the return status is left untouched. */
98 if( i_wanted > p_dec->p_data->p_payload_end
99 - p_dec->p_data->p_payload_start )
101 i_wanted = p_dec->p_data->p_payload_end
102 - p_dec->p_data->p_payload_start;
103 memcpy( p_dec->buffer + i_left,
104 p_dec->p_data->p_payload_start, i_wanted );
105 NextDataPacket( p_dec->p_fifo, &p_dec->p_data );
109 memcpy( p_dec->buffer + i_left,
110 p_dec->p_data->p_payload_start, i_wanted );
111 p_dec->p_data->p_payload_start += i_wanted;
114 if ( p_dec->p_fifo->b_die )
116 msg_Dbg( p_dec->p_fifo, "stopping libmad decoder" );
117 return MAD_FLOW_STOP;
120 if ( p_dec->p_fifo->b_error )
122 msg_Warn( p_dec->p_fifo, "ignoring current audio frame" );
123 return MAD_FLOW_IGNORE;
126 /* Pipe the new buffer content to libmad's stream decoder facility.
127 * Libmad never copies the buffer, but just references it. So keep
128 * it in mad_adec_thread_t structure. */
129 mad_stream_buffer( p_stream, (unsigned char*) &p_dec->buffer,
134 return MAD_FLOW_CONTINUE;
137 /*****************************************************************************
138 * libmad_output: this function is called just after the frame is decoded
139 *****************************************************************************/
140 enum mad_flow libmad_output( void *p_data, struct mad_header const *p_header,
141 struct mad_pcm *p_pcm )
143 mad_adec_thread_t * p_dec = (mad_adec_thread_t *) p_data;
144 aout_buffer_t * p_buffer;
145 mad_fixed_t const * p_left = p_pcm->samples[0];
146 mad_fixed_t const * p_right = p_pcm->samples[1];
147 register int i_samples = p_pcm->length;
148 mad_fixed_t * p_samples;
150 /* Creating the audio output fifo. Assume the samplerate and nr of channels
151 * from the first decoded frame is right for the entire audio track. */
152 if( (p_dec->p_aout_input != NULL) &&
153 (p_dec->output_format.i_rate != p_pcm->samplerate) )
155 /* Parameters changed - this should not happen. */
156 aout_InputDelete( p_dec->p_aout, p_dec->p_aout_input );
157 p_dec->p_aout_input = NULL;
160 /* Creating the audio input if not created yet. */
161 if( p_dec->p_aout_input == NULL )
163 p_dec->output_format.i_rate = p_pcm->samplerate;
164 /* p_dec->output_format.i_channels = p_pcm->channels; */
165 aout_DateInit( &p_dec->end_date, p_pcm->samplerate );
166 p_dec->p_aout_input = aout_InputNew( p_dec->p_fifo,
168 &p_dec->output_format );
170 if ( p_dec->p_aout_input == NULL )
172 p_dec->p_fifo->b_error = VLC_TRUE;
173 return MAD_FLOW_BREAK;
177 if( p_dec->i_current_pts )
179 /* Set the Presentation Time Stamp */
180 if( p_dec->i_current_pts != aout_DateGet( &p_dec->end_date ) )
182 aout_DateSet( &p_dec->end_date, p_dec->i_current_pts );
185 p_dec->i_current_pts = 0;
187 else if( p_dec->i_next_pts )
189 /* No PTS this time, but it'll be for next frame */
190 p_dec->i_current_pts = p_dec->i_next_pts;
191 p_dec->i_next_pts = 0;
194 if( !aout_DateGet( &p_dec->end_date ) )
196 /* No date available yet, wait for the first PTS. */
197 return MAD_FLOW_CONTINUE;
200 p_buffer = aout_BufferNew( p_dec->p_aout, p_dec->p_aout_input, i_samples );
202 if ( p_buffer == NULL )
204 msg_Err( p_dec->p_fifo, "allocating new buffer failed" );
205 return MAD_FLOW_BREAK;
208 p_buffer->start_date = aout_DateGet( &p_dec->end_date );
209 p_buffer->end_date = aout_DateIncrement( &p_dec->end_date, i_samples );
211 /* Interleave and keep buffers in mad_fixed_t format */
212 p_samples = (mad_fixed_t *)p_buffer->p_buffer;
214 switch( p_pcm->channels )
219 *p_samples++ = *p_left++;
220 *p_samples++ = *p_right++;
226 *p_samples++ = *p_left;
227 *p_samples++ = *p_left++;
231 msg_Err( p_dec->p_fifo, "cannot interleave %i channels",
235 aout_BufferPlay( p_dec->p_aout, p_dec->p_aout_input, p_buffer );
237 return MAD_FLOW_CONTINUE;
240 /*****************************************************************************
241 * libmad_error: this function is called when an error occurs during decoding
242 *****************************************************************************/
243 enum mad_flow libmad_error( void *data, struct mad_stream *p_libmad_stream,
244 struct mad_frame *p_libmad_frame )
246 mad_adec_thread_t *p_dec = (mad_adec_thread_t *) data;
247 enum mad_flow result = MAD_FLOW_CONTINUE;
249 switch (p_libmad_stream->error)
251 case MAD_ERROR_BUFLEN: /* input buffer too small (or EOF) */
252 msg_Err( p_dec->p_fifo, "input buffer too small (or EOF)" );
253 result = MAD_FLOW_CONTINUE;
255 case MAD_ERROR_BUFPTR: /* invalid (null) buffer pointer */
256 msg_Err( p_dec->p_fifo, "invalid (null) buffer pointer" );
257 result = MAD_FLOW_STOP;
259 case MAD_ERROR_NOMEM: /* not enough memory */
260 msg_Err( p_dec->p_fifo, "invalid (null) buffer pointer" );
261 result = MAD_FLOW_STOP;
263 case MAD_ERROR_LOSTSYNC: /* lost synchronization */
264 msg_Err( p_dec->p_fifo, "lost synchronization" );
265 mad_stream_sync(p_libmad_stream);
266 result = MAD_FLOW_CONTINUE;
268 case MAD_ERROR_BADLAYER: /* reserved header layer value */
269 msg_Err( p_dec->p_fifo, "reserved header layer value" );
270 result = MAD_FLOW_CONTINUE;
272 case MAD_ERROR_BADBITRATE: /* forbidden bitrate value */
273 msg_Err( p_dec->p_fifo, "forbidden bitrate value" );
274 result = MAD_FLOW_CONTINUE;
276 case MAD_ERROR_BADSAMPLERATE: /* reserved sample frequency value */
277 msg_Err( p_dec->p_fifo, "reserved sample frequency value" );
278 result = MAD_FLOW_CONTINUE;
280 case MAD_ERROR_BADEMPHASIS: /* reserved emphasis value */
281 msg_Err( p_dec->p_fifo, "reserverd emphasis value" );
282 result = MAD_FLOW_CONTINUE;
284 case MAD_ERROR_BADCRC: /* CRC check failed */
285 msg_Err( p_dec->p_fifo, "CRC check failed" );
286 result = MAD_FLOW_CONTINUE;
288 case MAD_ERROR_BADBITALLOC: /* forbidden bit allocation value */
289 msg_Err( p_dec->p_fifo, "forbidden bit allocation value" );
290 result = MAD_FLOW_IGNORE;
292 case MAD_ERROR_BADSCALEFACTOR:/* bad scalefactor index */
293 msg_Err( p_dec->p_fifo, "bad scalefactor index" );
294 result = MAD_FLOW_CONTINUE;
296 case MAD_ERROR_BADFRAMELEN: /* bad frame length */
297 msg_Err( p_dec->p_fifo, "bad frame length" );
298 result = MAD_FLOW_CONTINUE;
300 case MAD_ERROR_BADBIGVALUES: /* bad big_values count */
301 msg_Err( p_dec->p_fifo, "bad big values count" );
302 result = MAD_FLOW_IGNORE;
304 case MAD_ERROR_BADBLOCKTYPE: /* reserved block_type */
305 msg_Err( p_dec->p_fifo, "reserverd block_type" );
306 result = MAD_FLOW_IGNORE;
308 case MAD_ERROR_BADSCFSI: /* bad scalefactor selection info */
309 msg_Err( p_dec->p_fifo, "bad scalefactor selection info" );
310 result = MAD_FLOW_CONTINUE;
312 case MAD_ERROR_BADDATAPTR: /* bad main_data_begin pointer */
313 msg_Err( p_dec->p_fifo, "bad main_data_begin pointer" );
314 result = MAD_FLOW_STOP;
316 case MAD_ERROR_BADPART3LEN: /* bad audio data length */
317 msg_Err( p_dec->p_fifo, "bad audio data length" );
318 result = MAD_FLOW_IGNORE;
320 case MAD_ERROR_BADHUFFTABLE: /* bad Huffman table select */
321 msg_Err( p_dec->p_fifo, "bad Huffman table select" );
322 result = MAD_FLOW_IGNORE;
324 case MAD_ERROR_BADHUFFDATA: /* Huffman data overrun */
325 msg_Err( p_dec->p_fifo, "Huffman data overrun" );
326 result = MAD_FLOW_IGNORE;
328 case MAD_ERROR_BADSTEREO: /* incompatible block_type for JS */
329 msg_Err( p_dec->p_fifo, "incompatible block_type for JS" );
330 result = MAD_FLOW_IGNORE;
333 msg_Err( p_dec->p_fifo, "unknown error occured stopping decoder" );
334 result = MAD_FLOW_STOP;
338 return (MAD_RECOVERABLE(p_libmad_stream->error)? result: MAD_FLOW_STOP);
339 //return (MAD_FLOW_CONTINUE);
342 /*****************************************************************************
343 * libmad_message: this function is called to send a message
344 *****************************************************************************/
345 /* enum mad_flow libmad_message(void *, void*, unsigned int*)
347 * return MAD_FLOW_CONTINUE;
353 /****************************************************************************
354 * Print human readable informations about an audio MPEG frame. *
355 ****************************************************************************/
356 static void PrintFrameInfo(struct mad_header *Header)
362 /* Convert the layer number to its printed representation. */
363 switch(Header->layer)
375 Layer="(unexpected layer value)";
379 /* Convert the audio mode to its printed representation. */
382 case MAD_MODE_SINGLE_CHANNEL:
383 Mode="single channel";
385 case MAD_MODE_DUAL_CHANNEL:
388 case MAD_MODE_JOINT_STEREO:
389 Mode="joint (MS/intensity) stereo";
391 case MAD_MODE_STEREO:
392 Mode="normal LR stereo";
395 Mode="(unexpected mode value)";
399 /* Convert the emphasis to its printed representation. */
400 switch(Header->emphasis)
402 case MAD_EMPHASIS_NONE:
405 case MAD_EMPHASIS_50_15_US:
408 case MAD_EMPHASIS_CCITT_J_17:
409 Emphasis="CCITT J.17";
412 Emphasis="(unexpected emphasis value)";
416 //X msg_Err("statistics: %lu kb/s audio mpeg layer %s stream %s crc, "
417 //X "%s with %s emphasis at %d Hz sample rate\n",
418 //X Header->bitrate,Layer,
419 //X Header->flags&MAD_FLAG_PROTECTION?"with":"without",
420 //X Mode,Emphasis,Header->samplerate);