| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2005 Dave Chapman |
| * |
| * All files in this archive are subject to the GNU General Public License. |
| * See the file COPYING in the source tree root for full license agreement. |
| * |
| * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| * KIND, either express or implied. |
| * |
| ****************************************************************************/ |
| |
| #include "codeclib.h" |
| #include "libwma/asf.h" |
| #include "libwma/wmadec.h" |
| |
| CODEC_HEADER |
| |
| #define MAX_BLOCKSIZE 2048 |
| |
| /* The output buffers containing the decoded samples (channels 0 and 1) */ |
| |
| /* NOTE: WMADecodeContext is 142688 bytes (on x86) */ |
| static WMADecodeContext wmadec; |
| |
| /* TODO: Check the size of this */ |
| #define OUTBUF_SIZE 256*1024 |
| |
| enum asf_error_e { |
| ASF_ERROR_INTERNAL = -1, /* incorrect input to API calls */ |
| ASF_ERROR_OUTOFMEM = -2, /* some malloc inside program failed */ |
| ASF_ERROR_EOF = -3, /* unexpected end of file */ |
| ASF_ERROR_IO = -4, /* error reading or writing to file */ |
| ASF_ERROR_INVALID_LENGTH = -5, /* length value conflict in input data */ |
| ASF_ERROR_INVALID_VALUE = -6, /* other value conflict in input data */ |
| ASF_ERROR_INVALID_OBJECT = -7, /* ASF object missing or in wrong place */ |
| ASF_ERROR_OBJECT_SIZE = -8, /* invalid ASF object size (too small) */ |
| ASF_ERROR_SEEKABLE = -9, /* file not seekable */ |
| ASF_ERROR_SEEK = -10 /* file is seekable but seeking failed */ |
| }; |
| |
| /* Read an unaligned 32-bit little endian long from buffer. */ |
| static unsigned long get_long_le(void* buf) |
| { |
| unsigned char* p = (unsigned char*) buf; |
| |
| return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); |
| } |
| |
| /* Read an unaligned 16-bit little endian short from buffer. */ |
| static unsigned short get_short_le(void* buf) |
| { |
| unsigned char* p = (unsigned char*) buf; |
| |
| return p[0] | (p[1] << 8); |
| } |
| |
| #define GETLEN2b(bits) (((bits) == 0x03) ? 4 : bits) |
| |
| #define GETVALUE2b(bits, data) \ |
| (((bits) != 0x03) ? ((bits) != 0x02) ? ((bits) != 0x01) ? \ |
| 0 : *(data) : get_short_le(data) : get_long_le(data)) |
| |
| static int asf_read_packet(int* padding, asf_waveformatex_t* wfx) |
| { |
| uint8_t tmp8, packet_flags, packet_property; |
| int ec_length, opaque_data, ec_length_type; |
| int datalen; |
| uint8_t data[18]; |
| uint8_t* datap; |
| uint32_t length; |
| uint32_t padding_length; |
| uint32_t send_time; |
| uint16_t duration; |
| uint16_t payload_count; |
| int payload_length_type; |
| uint32_t payload_hdrlen; |
| int payload_datalen; |
| int multiple; |
| uint32_t replicated_length; |
| uint32_t media_object_number; |
| uint32_t media_object_offset; |
| uint32_t bytesread = 0; |
| |
| if (ci->read_filebuf(&tmp8, 1) == 0) { |
| return ASF_ERROR_EOF; |
| } |
| bytesread++; |
| |
| /* TODO: We need a better way to detect endofstream */ |
| if (tmp8 != 0x82) { return -1; } |
| |
| //DEBUGF("tmp8=0x%02x\n",tmp8); |
| |
| if (tmp8 & 0x80) { |
| ec_length = tmp8 & 0x0f; |
| opaque_data = (tmp8 >> 4) & 0x01; |
| ec_length_type = (tmp8 >> 5) & 0x03; |
| |
| if (ec_length_type != 0x00 || opaque_data != 0 || ec_length != 0x02) { |
| DEBUGF("incorrect error correction flags\n"); |
| return ASF_ERROR_INVALID_VALUE; |
| } |
| |
| /* Skip ec_data */ |
| ci->advance_buffer(ec_length); |
| bytesread += ec_length; |
| } else { |
| ec_length = 0; |
| } |
| |
| if (ci->read_filebuf(&packet_flags, 1) == 0) { return ASF_ERROR_EOF; } |
| if (ci->read_filebuf(&packet_property, 1) == 0) { return ASF_ERROR_EOF; } |
| bytesread += 2; |
| |
| datalen = GETLEN2b((packet_flags >> 1) & 0x03) + |
| GETLEN2b((packet_flags >> 3) & 0x03) + |
| GETLEN2b((packet_flags >> 5) & 0x03) + 6; |
| |
| #if 0 |
| if (datalen > sizeof(data)) { |
| DEBUGF("Unexpectedly long datalen in data - %d\n",datalen); |
| return ASF_ERROR_OUTOFMEM; |
| } |
| #endif |
| |
| if (ci->read_filebuf(data, datalen) == 0) { |
| return ASF_ERROR_EOF; |
| } |
| |
| bytesread += datalen; |
| |
| datap = data; |
| length = GETVALUE2b((packet_flags >> 5) & 0x03, datap); |
| datap += GETLEN2b((packet_flags >> 5) & 0x03); |
| /* sequence value is not used */ |
| GETVALUE2b((packet_flags >> 1) & 0x03, datap); |
| datap += GETLEN2b((packet_flags >> 1) & 0x03); |
| padding_length = GETVALUE2b((packet_flags >> 3) & 0x03, datap); |
| datap += GETLEN2b((packet_flags >> 3) & 0x03); |
| send_time = get_long_le(datap); |
| datap += 4; |
| duration = get_short_le(datap); |
| datap += 2; |
| |
| /* this is really idiotic, packet length can (and often will) be |
| * undefined and we just have to use the header packet size as the size |
| * value */ |
| if (!((packet_flags >> 5) & 0x03)) { |
| length = wfx->packet_size; |
| } |
| |
| /* this is also really idiotic, if packet length is smaller than packet |
| * size, we need to manually add the additional bytes into padding length |
| */ |
| if (length < wfx->packet_size) { |
| padding_length += wfx->packet_size - length; |
| length = wfx->packet_size; |
| } |
| |
| if (length > wfx->packet_size) { |
| DEBUGF("packet with too big length value\n"); |
| return ASF_ERROR_INVALID_LENGTH; |
| } |
| |
| /* check if we have multiple payloads */ |
| if (packet_flags & 0x01) { |
| if (ci->read_filebuf(&tmp8, 1) == 0) { |
| return ASF_ERROR_EOF; |
| } |
| payload_count = tmp8 & 0x3f; |
| payload_length_type = (tmp8 >> 6) & 0x03; |
| bytesread++; |
| } else { |
| payload_count = 1; |
| payload_length_type = 0x02; /* not used */ |
| } |
| |
| if (length < bytesread) { |
| DEBUGF("header exceeded packet size, invalid file - length=%d, bytesread=%d\n",(int)length,(int)bytesread); |
| /* FIXME: should this be checked earlier? */ |
| return ASF_ERROR_INVALID_LENGTH; |
| } |
| |
| if (ci->read_filebuf(&tmp8, 1) == 0) { |
| return ASF_ERROR_EOF; |
| } |
| //DEBUGF("stream = %u\n",tmp8&0x7f); |
| bytesread++; |
| |
| if ((tmp8 & 0x7f) != wfx->audiostream) { |
| /* Not interested in this packet, just skip it */ |
| ci->advance_buffer(length - bytesread); |
| return 0; |
| } else { |
| /* We are now at the data */ |
| //DEBUGF("Read packet - length=%u, padding_length=%u, send_time=%u, duration=%u, payload_count=%d, bytesread=%d\n",length,padding_length,(int)send_time,duration,payload_count,bytesread); |
| |
| /* TODO: Loop through all payloads in this packet - or do we |
| assume that audio streams only have one payload per packet? */ |
| |
| payload_hdrlen = GETLEN2b(packet_property & 0x03) + |
| GETLEN2b((packet_property >> 2) & 0x03) + |
| GETLEN2b((packet_property >> 4) & 0x03); |
| |
| //DEBUGF("payload_hdrlen = %d\n",payload_hdrlen); |
| #if 0 |
| /* TODO */ |
| if (payload_hdrlen > size) { |
| return ASF_ERROR_INVALID_LENGTH; |
| } |
| #endif |
| if (payload_hdrlen > sizeof(data)) { |
| DEBUGF("Unexpectedly long datalen in data - %d\n",datalen); |
| return ASF_ERROR_OUTOFMEM; |
| } |
| |
| if (ci->read_filebuf(data, payload_hdrlen) == 0) { |
| return ASF_ERROR_EOF; |
| } |
| bytesread += payload_hdrlen; |
| |
| datap = data; |
| media_object_number = GETVALUE2b((packet_property >> 4) & 0x03, datap); |
| datap += GETLEN2b((packet_property >> 4) & 0x03); |
| media_object_offset = GETVALUE2b((packet_property >> 2) & 0x03, datap); |
| datap += GETLEN2b((packet_property >> 2) & 0x03); |
| replicated_length = GETVALUE2b(packet_property & 0x03, datap); |
| datap += GETLEN2b(packet_property & 0x03); |
| |
| /* TODO: Validate replicated_length */ |
| /* TODO: Is the content of this important for us? */ |
| ci->advance_buffer(replicated_length); |
| bytesread += replicated_length; |
| |
| |
| multiple = packet_flags & 0x01; |
| |
| if (multiple) { |
| int x; |
| |
| x = GETLEN2b(payload_length_type); |
| |
| if (x != 2) { |
| /* in multiple payloads datalen should be a word */ |
| return ASF_ERROR_INVALID_VALUE; |
| } |
| |
| #if 0 |
| if (skip + tmp > datalen) { |
| /* not enough data */ |
| return ASF_ERROR_INVALID_LENGTH; |
| } |
| #endif |
| if (ci->read_filebuf(&data, x) == 0) { |
| return ASF_ERROR_EOF; |
| } |
| bytesread += x; |
| payload_datalen = GETVALUE2b(payload_length_type, data); |
| } else { |
| payload_datalen = length - bytesread; |
| } |
| |
| //DEBUGF("WE HAVE DATA - %d bytes\n", payload_datalen); |
| // lseek(fd, payload_datalen, SEEK_CUR); |
| *padding = padding_length; |
| return payload_datalen; |
| } |
| } |
| |
| /* this is the codec entry point */ |
| enum codec_status codec_main(void) |
| { |
| uint32_t samplesdone; |
| uint32_t elapsedtime; |
| int retval; |
| asf_waveformatex_t wfx; |
| uint32_t currentframe; |
| unsigned char* inbuffer; |
| size_t resume_offset; |
| size_t n; |
| int wmares, res, padding, outbufsize; |
| uint8_t* outbuf; |
| |
| /* Generic codec initialisation */ |
| ci->configure(CODEC_SET_FILEBUF_WATERMARK, 1024*512); |
| ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, 1024*128); |
| |
| ci->configure(DSP_SET_SAMPLE_DEPTH, 15); |
| |
| 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; |
| |
| if (codec_init()) { |
| LOGF("WMA: Error initialising codec\n"); |
| retval = CODEC_ERROR; |
| goto exit; |
| } |
| |
| outbuf = codec_malloc(OUTBUF_SIZE); |
| |
| /* 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)); |
| |
| wma_decode_init(&wmadec,&wfx); |
| |
| /* Now advance the file position to the first frame */ |
| ci->seek_buffer(ci->id3->first_frame_offset); |
| |
| ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate); |
| ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ? |
| STEREO_MONO : STEREO_INTERLEAVED); |
| codec_set_replaygain(ci->id3); |
| |
| /* The main decoding loop */ |
| |
| currentframe = 0; |
| samplesdone = 0; |
| |
| DEBUGF("**************** IN WMA.C ******************\n"); |
| wma_decode_init(&wmadec,&wfx); |
| |
| res = 1; |
| while (res >= 0) |
| { |
| ci->yield(); |
| if (ci->stop_codec || ci->new_track) { |
| goto done; |
| } |
| |
| /* Deal with any pending seek requests - ignore them */ |
| if (ci->seek_time) |
| { |
| ci->seek_complete(); |
| } |
| |
| res = asf_read_packet(&padding, &wfx); |
| if (res > 0) { |
| inbuffer = ci->request_buffer(&n, res - padding); |
| |
| wmares = wma_decode_superframe(&wmadec, |
| outbuf,&outbufsize, |
| inbuffer,res - padding); |
| |
| ci->advance_buffer(res); |
| |
| if (wmares > 0) { |
| ci->pcmbuf_insert(outbuf, NULL, outbufsize / (wfx.channels * 2)); |
| samplesdone += (outbufsize / (wfx.channels * 2)); |
| DEBUGF("Decoded %d samples\n",(outbufsize / (wfx.channels * 2))); |
| elapsedtime = (samplesdone*10)/(wfx.rate/100); |
| ci->set_elapsed(elapsedtime); |
| } |
| |
| ci->yield (); |
| } |
| } |
| retval = CODEC_OK; |
| |
| done: |
| LOGF("WMA: Decoded %ld samples\n",samplesdone); |
| |
| if (ci->request_next_track()) |
| goto next_track; |
| |
| exit: |
| return retval; |
| } |