/***************************************************************************** * OpenDecoder: probe the decoder and return score *****************************************************************************/ static int OpenDecoder( vlc_object_t *p_this ) { decoder_t *p_dec = (decoder_t*)p_this; decoder_sys_t *p_sys; if( p_dec->fmt_in.i_codec != VLC_CODEC_WMA1 && p_dec->fmt_in.i_codec != VLC_CODEC_WMA2 ) { return VLC_EGENERIC; } /* Allocate the memory needed to store the decoder's structure */ p_dec->p_sys = p_sys = (decoder_sys_t *)malloc(sizeof(decoder_sys_t)); if( !p_sys ) return VLC_ENOMEM; memset( p_sys, 0, sizeof( decoder_sys_t ) ); /* Date */ date_Init( &p_sys->end_date, p_dec->fmt_in.audio.i_rate, 1 ); /* Set output properties */ p_dec->fmt_out.i_cat = AUDIO_ES; p_dec->fmt_out.i_codec = VLC_CODEC_FI32; p_dec->fmt_out.audio.i_bitspersample = p_dec->fmt_in.audio.i_bitspersample; p_dec->fmt_out.audio.i_rate = p_dec->fmt_in.audio.i_rate; p_dec->fmt_out.audio.i_channels = p_dec->fmt_in.audio.i_channels; assert( p_dec->fmt_out.audio.i_channels < ( sizeof( pi_channels_maps ) / sizeof( pi_channels_maps[0] ) ) ); p_dec->fmt_out.audio.i_original_channels = p_dec->fmt_out.audio.i_physical_channels = pi_channels_maps[p_dec->fmt_out.audio.i_channels]; /* aout core assumes this number is not 0 and uses it in divisions */ assert( p_dec->fmt_out.audio.i_physical_channels != 0 ); asf_waveformatex_t wfx; wfx.rate = p_dec->fmt_in.audio.i_rate; wfx.bitrate = p_dec->fmt_in.i_bitrate; wfx.channels = p_dec->fmt_in.audio.i_channels; wfx.blockalign = p_dec->fmt_in.audio.i_blockalign; wfx.bitspersample = p_dec->fmt_in.audio.i_bitspersample; msg_Dbg( p_dec, "samplerate %d bitrate %d channels %d align %d bps %d", wfx.rate, wfx.bitrate, wfx.channels, wfx.blockalign, wfx.bitspersample ); if( p_dec->fmt_in.i_codec == VLC_CODEC_WMA1 ) wfx.codec_id = ASF_CODEC_ID_WMAV1; else if( p_dec->fmt_in.i_codec == VLC_CODEC_WMA2 ) wfx.codec_id = ASF_CODEC_ID_WMAV2; wfx.datalen = p_dec->fmt_in.i_extra; if( wfx.datalen > 6 ) wfx.datalen = 6; if( wfx.datalen > 0 ) memcpy( wfx.data, p_dec->fmt_in.p_extra, wfx.datalen ); /* Init codec */ if( wma_decode_init(&p_sys->wmadec, &wfx ) < 0 ) { msg_Err( p_dec, "codec init failed" ); free( p_sys ); return VLC_EGENERIC; } /* Set callback */ p_dec->pf_decode_audio = DecodeFrame; return VLC_SUCCESS; }
/* 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; }