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->bit_stream.p_pes->i_pts;
88 i_wanted = MAD_BUFFER_MDLEN;
91 /* Store timestamp for this frame */
92 p_dec->i_current_pts = p_dec->bit_stream.p_pes->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 > (size_t)(p_dec->bit_stream.p_data->p_payload_end
99 - p_dec->bit_stream.p_data->p_payload_start) )
101 i_wanted = p_dec->bit_stream.p_data->p_payload_end
102 - p_dec->bit_stream.p_data->p_payload_start;
103 memcpy( p_dec->buffer + i_left,
104 p_dec->bit_stream.p_data->p_payload_start, i_wanted );
105 NextDataPacket( p_dec->p_fifo, &p_dec->bit_stream );
106 /* No need to check that p_dec->bit_stream->p_data is valid
107 * since we check later on for b_die and b_error */
111 memcpy( p_dec->buffer + i_left,
112 p_dec->bit_stream.p_data->p_payload_start, i_wanted );
113 p_dec->bit_stream.p_data->p_payload_start += i_wanted;
116 if ( p_dec->p_fifo->b_die )
118 msg_Dbg( p_dec->p_fifo, "stopping libmad decoder" );
119 return MAD_FLOW_STOP;
122 if ( p_dec->p_fifo->b_error )
124 msg_Warn( p_dec->p_fifo, "ignoring current audio frame" );
125 return MAD_FLOW_IGNORE;
128 /* Pipe the new buffer content to libmad's stream decoder facility.
129 * Libmad never copies the buffer, but just references it. So keep
130 * it in mad_adec_thread_t structure. */
131 mad_stream_buffer( p_stream, (unsigned char*) &p_dec->buffer,
136 return MAD_FLOW_CONTINUE;
139 /*****************************************************************************
140 * libmad_output: this function is called just after the frame is decoded
141 *****************************************************************************/
142 enum mad_flow libmad_output( void *p_data, struct mad_header const *p_header,
143 struct mad_pcm *p_pcm )
145 mad_adec_thread_t * p_dec = (mad_adec_thread_t *) p_data;
146 aout_buffer_t * p_buffer;
147 mad_fixed_t const * p_left = p_pcm->samples[0];
148 mad_fixed_t const * p_right = p_pcm->samples[1];
149 unsigned int i_samples = p_pcm->length;
150 mad_fixed_t * p_samples;
151 unsigned int i_channels = (p_pcm->channels == 2) ?
152 AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT :
155 /* Creating the audio output fifo. Assume the samplerate and nr of channels
156 * from the first decoded frame is right for the entire audio track. */
157 if( (p_dec->p_aout_input != NULL) &&
158 (p_dec->output_format.i_rate != p_pcm->samplerate
159 || p_dec->output_format.i_physical_channels != i_channels) )
161 /* Parameters changed - this should not happen. */
162 aout_DecDelete( p_dec->p_aout, p_dec->p_aout_input );
163 p_dec->p_aout_input = NULL;
166 /* Creating the audio input if not created yet. */
167 if( p_dec->p_aout_input == NULL )
169 p_dec->output_format.i_rate = p_pcm->samplerate;
170 p_dec->output_format.i_physical_channels = i_channels;
171 p_dec->output_format.i_original_channels = i_channels;
172 aout_DateInit( &p_dec->end_date, p_pcm->samplerate );
173 p_dec->p_aout_input = aout_DecNew( p_dec->p_fifo,
175 &p_dec->output_format );
177 if ( p_dec->p_aout_input == NULL )
179 p_dec->p_fifo->b_error = VLC_TRUE;
180 return MAD_FLOW_BREAK;
184 if( p_dec->i_current_pts )
186 /* Set the Presentation Time Stamp */
187 if( p_dec->i_current_pts != aout_DateGet( &p_dec->end_date ) )
189 aout_DateSet( &p_dec->end_date, p_dec->i_current_pts );
192 p_dec->i_current_pts = 0;
194 else if( p_dec->i_next_pts )
196 /* No PTS this time, but it'll be for next frame */
197 p_dec->i_current_pts = p_dec->i_next_pts;
198 p_dec->i_next_pts = 0;
201 if( !aout_DateGet( &p_dec->end_date ) )
203 /* No date available yet, wait for the first PTS. */
204 return MAD_FLOW_CONTINUE;
207 p_buffer = aout_DecNewBuffer( p_dec->p_aout, p_dec->p_aout_input, i_samples );
209 if ( p_buffer == NULL )
211 msg_Err( p_dec->p_fifo, "allocating new buffer failed" );
212 return MAD_FLOW_BREAK;
215 p_buffer->start_date = aout_DateGet( &p_dec->end_date );
216 p_buffer->end_date = aout_DateIncrement( &p_dec->end_date, i_samples );
218 /* Interleave and keep buffers in mad_fixed_t format */
219 p_samples = (mad_fixed_t *)p_buffer->p_buffer;
221 switch( p_pcm->channels )
226 *p_samples++ = *p_left++;
227 *p_samples++ = *p_right++;
232 p_dec->p_fifo->p_vlc->pf_memcpy( p_samples, p_left,
233 i_samples * sizeof(mad_fixed_t) );
237 msg_Err( p_dec->p_fifo, "cannot interleave %i channels",
241 aout_DecPlay( p_dec->p_aout, p_dec->p_aout_input, p_buffer );
243 return MAD_FLOW_CONTINUE;
246 /*****************************************************************************
247 * libmad_error: this function is called when an error occurs during decoding
248 *****************************************************************************/
249 enum mad_flow libmad_error( void *data, struct mad_stream *p_libmad_stream,
250 struct mad_frame *p_libmad_frame )
252 mad_adec_thread_t *p_dec = (mad_adec_thread_t *) data;
253 enum mad_flow result = MAD_FLOW_CONTINUE;
255 switch (p_libmad_stream->error)
257 case MAD_ERROR_BUFLEN: /* input buffer too small (or EOF) */
258 msg_Err( p_dec->p_fifo, "input buffer too small (or EOF)" );
259 result = MAD_FLOW_CONTINUE;
261 case MAD_ERROR_BUFPTR: /* invalid (null) buffer pointer */
262 msg_Err( p_dec->p_fifo, "invalid (null) buffer pointer" );
263 result = MAD_FLOW_STOP;
265 case MAD_ERROR_NOMEM: /* not enough memory */
266 msg_Err( p_dec->p_fifo, "invalid (null) buffer pointer" );
267 result = MAD_FLOW_STOP;
269 case MAD_ERROR_LOSTSYNC: /* lost synchronization */
270 msg_Err( p_dec->p_fifo, "lost synchronization" );
271 mad_stream_sync(p_libmad_stream);
272 result = MAD_FLOW_CONTINUE;
274 case MAD_ERROR_BADLAYER: /* reserved header layer value */
275 msg_Err( p_dec->p_fifo, "reserved header layer value" );
276 result = MAD_FLOW_CONTINUE;
278 case MAD_ERROR_BADBITRATE: /* forbidden bitrate value */
279 msg_Err( p_dec->p_fifo, "forbidden bitrate value" );
280 result = MAD_FLOW_CONTINUE;
282 case MAD_ERROR_BADSAMPLERATE: /* reserved sample frequency value */
283 msg_Err( p_dec->p_fifo, "reserved sample frequency value" );
284 result = MAD_FLOW_CONTINUE;
286 case MAD_ERROR_BADEMPHASIS: /* reserved emphasis value */
287 msg_Err( p_dec->p_fifo, "reserverd emphasis value" );
288 result = MAD_FLOW_CONTINUE;
290 case MAD_ERROR_BADCRC: /* CRC check failed */
291 msg_Err( p_dec->p_fifo, "CRC check failed" );
292 result = MAD_FLOW_CONTINUE;
294 case MAD_ERROR_BADBITALLOC: /* forbidden bit allocation value */
295 msg_Err( p_dec->p_fifo, "forbidden bit allocation value" );
296 result = MAD_FLOW_IGNORE;
298 case MAD_ERROR_BADSCALEFACTOR:/* bad scalefactor index */
299 msg_Err( p_dec->p_fifo, "bad scalefactor index" );
300 result = MAD_FLOW_CONTINUE;
302 case MAD_ERROR_BADFRAMELEN: /* bad frame length */
303 msg_Err( p_dec->p_fifo, "bad frame length" );
304 result = MAD_FLOW_CONTINUE;
306 case MAD_ERROR_BADBIGVALUES: /* bad big_values count */
307 msg_Err( p_dec->p_fifo, "bad big values count" );
308 result = MAD_FLOW_IGNORE;
310 case MAD_ERROR_BADBLOCKTYPE: /* reserved block_type */
311 msg_Err( p_dec->p_fifo, "reserverd block_type" );
312 result = MAD_FLOW_IGNORE;
314 case MAD_ERROR_BADSCFSI: /* bad scalefactor selection info */
315 msg_Err( p_dec->p_fifo, "bad scalefactor selection info" );
316 result = MAD_FLOW_CONTINUE;
318 case MAD_ERROR_BADDATAPTR: /* bad main_data_begin pointer */
319 msg_Err( p_dec->p_fifo, "bad main_data_begin pointer" );
320 result = MAD_FLOW_STOP;
322 case MAD_ERROR_BADPART3LEN: /* bad audio data length */
323 msg_Err( p_dec->p_fifo, "bad audio data length" );
324 result = MAD_FLOW_IGNORE;
326 case MAD_ERROR_BADHUFFTABLE: /* bad Huffman table select */
327 msg_Err( p_dec->p_fifo, "bad Huffman table select" );
328 result = MAD_FLOW_IGNORE;
330 case MAD_ERROR_BADHUFFDATA: /* Huffman data overrun */
331 msg_Err( p_dec->p_fifo, "Huffman data overrun" );
332 result = MAD_FLOW_IGNORE;
334 case MAD_ERROR_BADSTEREO: /* incompatible block_type for JS */
335 msg_Err( p_dec->p_fifo, "incompatible block_type for JS" );
336 result = MAD_FLOW_IGNORE;
339 msg_Err( p_dec->p_fifo, "unknown error occured stopping decoder" );
340 result = MAD_FLOW_STOP;
344 return (MAD_RECOVERABLE(p_libmad_stream->error)? result: MAD_FLOW_STOP);
345 //return (MAD_FLOW_CONTINUE);
348 /*****************************************************************************
349 * libmad_message: this function is called to send a message
350 *****************************************************************************/
351 /* enum mad_flow libmad_message(void *, void*, unsigned int*)
353 * return MAD_FLOW_CONTINUE;
359 /****************************************************************************
360 * Print human readable informations about an audio MPEG frame.
361 ****************************************************************************/
362 static void PrintFrameInfo(struct mad_header *Header)
368 /* Convert the layer number to its printed representation. */
369 switch(Header->layer)
381 Layer="(unexpected layer value)";
385 /* Convert the audio mode to its printed representation. */
388 case MAD_MODE_SINGLE_CHANNEL:
389 Mode="single channel";
391 case MAD_MODE_DUAL_CHANNEL:
394 case MAD_MODE_JOINT_STEREO:
395 Mode="joint (MS/intensity) stereo";
397 case MAD_MODE_STEREO:
398 Mode="normal LR stereo";
401 Mode="(unexpected mode value)";
405 /* Convert the emphasis to its printed representation. */
406 switch(Header->emphasis)
408 case MAD_EMPHASIS_NONE:
411 case MAD_EMPHASIS_50_15_US:
414 case MAD_EMPHASIS_CCITT_J_17:
415 Emphasis="CCITT J.17";
418 Emphasis="(unexpected emphasis value)";
422 //X msg_Err("statistics: %lu kb/s audio mpeg layer %s stream %s crc, "
423 //X "%s with %s emphasis at %d Hz sample rate\n",
424 //X Header->bitrate,Layer,
425 //X Header->flags&MAD_FLAG_PROTECTION?"with":"without",
426 //X Mode,Emphasis,Header->samplerate);