/***************************************************************************** * DecodeFrame: decodes a wma frame. *****************************************************************************/ static aout_buffer_t *DecodeFrame( decoder_t *p_dec, block_t **pp_block ) { decoder_sys_t *p_sys = p_dec->p_sys; block_t *p_block; aout_buffer_t *p_aout_buffer = NULL; if( !pp_block || !*pp_block ) return NULL; p_block = *pp_block; if( p_block->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) ) { date_Set( &p_sys->end_date, 0 ); block_Release( p_block ); *pp_block = NULL; return NULL; } if( p_block->i_buffer <= 0 ) { /* we already decoded the samples, just feed a few to aout */ if( p_sys->i_samples ) p_aout_buffer = SplitBuffer( p_dec ); if( !p_sys->i_samples ) { /* we need to decode new samples now */ free( p_sys->p_output ); p_sys->p_output = NULL; block_Release( p_block ); *pp_block = NULL; } return p_aout_buffer; } /* Date management */ if( p_block->i_pts > VLC_TS_INVALID && p_block->i_pts != date_Get( &p_sys->end_date ) ) { date_Set( &p_sys->end_date, p_block->i_pts ); /* don't reuse the same pts */ p_block->i_pts = VLC_TS_INVALID; } else if( !date_Get( &p_sys->end_date ) ) { /* We've just started the stream, wait for the first PTS. */ block_Release( p_block ); return NULL; } if( wma_decode_superframe_init( &p_sys->wmadec, p_block->p_buffer, p_block->i_buffer ) == 0 ) { msg_Err( p_dec, "failed initializing wmafixed decoder" ); block_Release( p_block ); *pp_block = NULL; return NULL; } if( p_sys->wmadec.nb_frames <= 0 ) { msg_Err( p_dec, "can not decode, invalid ASF packet ?" ); block_Release( p_block ); *pp_block = NULL; return NULL; } /* worst case */ size_t i_buffer = BLOCK_MAX_SIZE * MAX_CHANNELS * p_sys->wmadec.nb_frames; free( p_sys->p_output ); p_sys->p_output = malloc(i_buffer * sizeof(int32_t) ); p_sys->p_samples = (int8_t*)p_sys->p_output; if( !p_sys->p_output ) { /* OOM, will try a bit later if VLC hasn't been killed */ block_Release( p_block ); return NULL; } p_sys->i_samples = 0; for( int i = 0 ; i < p_sys->wmadec.nb_frames; i++ ) { int i_samples = 0; i_samples = wma_decode_superframe_frame( &p_sys->wmadec, p_sys->p_output + p_sys->i_samples * p_sys->wmadec.nb_channels, p_block->p_buffer, p_block->i_buffer ); if( i_samples < 0 ) { msg_Warn( p_dec, "wma_decode_superframe_frame() failed for frame %d", i ); free( p_sys->p_output ); p_sys->p_output = NULL; return NULL; } p_sys->i_samples += i_samples; /* advance in the samples buffer */ } p_block->i_buffer = 0; /* this block has been decoded */ for( size_t s = 0 ; s < i_buffer; s++ ) p_sys->p_output[s] >>= 2; /* Q30 -> Q28 translation */ p_aout_buffer = SplitBuffer( p_dec ); assert( p_aout_buffer ); return p_aout_buffer; }
/* this is called for each file to process */ enum codec_status codec_run(void) { uint32_t elapsedtime; asf_waveformatex_t wfx; size_t resume_offset; int i; int wmares; int res = 0; uint8_t* audiobuf; int audiobufsize; int packetlength = 0; int errcount = 0; intptr_t param; /* Proper reset of the decoder context. */ memset(&wmadec, 0, sizeof(wmadec)); /* Remember the resume position - when the codec is opened, the playback engine will reset it. */ resume_offset = ci->id3->offset; restart_track: if (codec_init()) { LOGF("WMA: Error initialising codec\n"); return CODEC_ERROR; } /* Copy the format metadata we've stored in the id3 TOC field. This saves us from parsing it again here. */ memcpy(&wfx, ci->id3->toc, sizeof(wfx)); ci->seek_buffer(ci->id3->first_frame_offset); if (wma_decode_init(&wmadec,&wfx) < 0) { LOGF("WMA: Unsupported or corrupt file\n"); return CODEC_ERROR; } if (resume_offset > ci->id3->first_frame_offset) { /* Get start of current packet */ int packet_offset = (resume_offset - ci->id3->first_frame_offset) % wfx.packet_size; ci->seek_buffer(resume_offset - packet_offset); elapsedtime = asf_get_timestamp(&i); } else { /* Now advance the file position to the first frame */ ci->seek_buffer(ci->id3->first_frame_offset); elapsedtime = 0; } ci->set_elapsed(elapsedtime); resume_offset = 0; ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate); ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ? STEREO_MONO : STEREO_NONINTERLEAVED); codec_set_replaygain(ci->id3); /* The main decoding loop */ while (res >= 0) { enum codec_command_action action = ci->get_command(¶m); if (action == CODEC_ACTION_HALT) break; /* Deal with any pending seek requests */ if (action == CODEC_ACTION_SEEK_TIME) { if (param == 0) { ci->set_elapsed(0); ci->seek_complete(); goto restart_track; /* Pretend you never saw this... */ } elapsedtime = asf_seek(param, &wfx); if (elapsedtime < 1){ ci->set_elapsed(0); ci->seek_complete(); break; } /*DEBUGF("Seek returned %d\n", (int)elapsedtime);*/ /*flush the wma decoder state*/ wmadec.last_superframe_len = 0; wmadec.last_bitoffset = 0; ci->set_elapsed(elapsedtime); ci->seek_complete(); } errcount = 0; new_packet: res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx); if (res < 0) { /* We'll try to recover from a parse error a certain number of * times. If we succeed, the error counter will be reset. */ if (res == ASF_ERROR_EOF) { /* File ended - not an error */ break; } errcount++; DEBUGF("read_packet error %d, errcount %d\n",wmares, errcount); if (errcount > 5) { return CODEC_ERROR; } else { ci->advance_buffer(packetlength); goto new_packet; } } else if (res > 0) { wma_decode_superframe_init(&wmadec, audiobuf, audiobufsize); for (i=0; i < wmadec.nb_frames; i++) { wmares = wma_decode_superframe_frame(&wmadec, audiobuf, audiobufsize); ci->yield (); if (wmares < 0) { /* Do the above, but for errors in decode. */ errcount++; DEBUGF("WMA decode error %d, errcount %d\n",wmares, errcount); if (errcount > 5) { return CODEC_ERROR; } else { ci->advance_buffer(packetlength); goto new_packet; } } else if (wmares > 0) { ci->pcmbuf_insert((*wmadec.frame_out)[0], (*wmadec.frame_out)[1], wmares); elapsedtime += (wmares*10)/(wfx.rate/100); ci->set_elapsed(elapsedtime); } } } ci->advance_buffer(packetlength); } /*LOGF("WMA: Decoded %ld samples\n",elapsedtime*wfx.rate/1000);*/ return CODEC_OK; }
/* this is the codec entry point */ enum codec_status codec_main(void) { uint32_t elapsedtime; int retval; asf_waveformatex_t wfx; size_t resume_offset; int i; int wmares, res; uint8_t* audiobuf; int audiobufsize; int packetlength = 0; int errcount = 0; /* Generic codec initialisation */ ci->configure(DSP_SET_SAMPLE_DEPTH, 29); next_track: /* Wait for the metadata to be read */ while (!*ci->taginfo_ready && !ci->stop_codec) ci->sleep(1); retval = CODEC_OK; /* Remember the resume position - when the codec is opened, the playback engine will reset it. */ resume_offset = ci->id3->offset; restart_track: if (codec_init()) { LOGF("WMA: Error initialising codec\n"); retval = CODEC_ERROR; goto exit; } /* Copy the format metadata we've stored in the id3 TOC field. This saves us from parsing it again here. */ memcpy(&wfx, ci->id3->toc, sizeof(wfx)); if (wma_decode_init(&wmadec,&wfx) < 0) { LOGF("WMA: Unsupported or corrupt file\n"); retval = CODEC_ERROR; goto exit; } if (resume_offset > ci->id3->first_frame_offset) { /* Get start of current packet */ int packet_offset = (resume_offset - ci->id3->first_frame_offset) % wfx.packet_size; ci->seek_buffer(resume_offset - packet_offset); elapsedtime = asf_get_timestamp(&i); ci->set_elapsed(elapsedtime); } else { /* Now advance the file position to the first frame */ ci->seek_buffer(ci->id3->first_frame_offset); elapsedtime = 0; } resume_offset = 0; ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate); ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ? STEREO_MONO : STEREO_NONINTERLEAVED); codec_set_replaygain(ci->id3); /* The main decoding loop */ res = 1; while (res >= 0) { ci->yield(); if (ci->stop_codec || ci->new_track) { goto done; } /* Deal with any pending seek requests */ if (ci->seek_time){ if (ci->seek_time == 1) { ci->seek_complete(); goto restart_track; /* Pretend you never saw this... */ } elapsedtime = asf_seek(ci->seek_time, &wfx); if (elapsedtime < 1){ ci->seek_complete(); goto next_track; } /*DEBUGF("Seek returned %d\n", (int)elapsedtime);*/ ci->set_elapsed(elapsedtime); /*flush the wma decoder state*/ wmadec.last_superframe_len = 0; wmadec.last_bitoffset = 0; ci->seek_complete(); } errcount = 0; new_packet: res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx); if (res < 0) { /* We'll try to recover from a parse error a certain number of * times. If we succeed, the error counter will be reset. */ errcount++; DEBUGF("read_packet error %d, errcount %d\n",wmares, errcount); if (errcount > 5) { goto done; } else { ci->advance_buffer(packetlength); goto new_packet; } } else if (res > 0) { wma_decode_superframe_init(&wmadec, audiobuf, audiobufsize); for (i=0; i < wmadec.nb_frames; i++) { wmares = wma_decode_superframe_frame(&wmadec, audiobuf, audiobufsize); ci->yield (); if (wmares < 0) { /* Do the above, but for errors in decode. */ errcount++; DEBUGF("WMA decode error %d, errcount %d\n",wmares, errcount); if (errcount > 5) { goto done; } else { ci->advance_buffer(packetlength); goto new_packet; } } else if (wmares > 0) { ci->pcmbuf_insert((*wmadec.frame_out)[0], (*wmadec.frame_out)[1], wmares); elapsedtime += (wmares*10)/(wfx.rate/100); ci->set_elapsed(elapsedtime); } ci->yield(); } } ci->advance_buffer(packetlength); } retval = CODEC_OK; done: /*LOGF("WMA: Decoded %ld samples\n",elapsedtime*wfx.rate/1000);*/ if (ci->request_next_track()) goto next_track; exit: return retval; }