/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2007 Dave Chapman * * ASF parsing code based on libasf by Juho Vähä-Herttua * http://code.google.com/p/libasf/ libasf itself was based on the ASF * parser in VLC - http://www.videolan.org/ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * 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 int packet_count=0; /* The output buffer containing the decoded samples (channels 0 and 1) BLOCK_MAX_SIZE is 2048 (samples) and MAX_CHANNELS is 2. */ static uint32_t decoded[BLOCK_MAX_SIZE * MAX_CHANNELS]; /* NOTE: WMADecodeContext is 120152 bytes (on x86) */ static WMADecodeContext wmadec; 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(uint8_t** audiobuf, int* audiobufsize, int* packetlength, asf_waveformatex_t* wfx) { uint8_t tmp8, packet_flags, packet_property; int stream_id; 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; uint8_t* buf; size_t bufsize; int i; /*DEBUGF("Reading new packet at %d bytes ", (int)ci->curpos);*/ if (ci->read_filebuf(&tmp8, 1) == 0) { return ASF_ERROR_EOF; } bytesread++; /* TODO: We need a better way to detect endofstream */ if (tmp8 != 0x82) { DEBUGF("Read failed: packet did not sync\n"); return -1; } 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; /*DEBUGF("and duration %d ms\n", duration);*/ /* 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; } /* We now parse the individual payloads, and move all payloads belonging to our audio stream to a contiguous block, starting at the location of the first payload. */ *audiobuf = NULL; *audiobufsize = 0; *packetlength = length - bytesread; buf = ci->request_buffer(&bufsize, length); datap = buf; if (bufsize != length) { /* This should only happen with packets larger than 32KB (the guard buffer size). All the streams I've seen have relatively small packets less than about 8KB), but I don't know what is expected. */ DEBUGF("Could not read packet (requested %d bytes, received %d), curpos=%d, aborting\n", (int)length,(int)bufsize,(int)ci->curpos); return -1; } for (i=0; i> 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; } bytesread += payload_hdrlen; 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? */ datap += 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 payload_datalen = GETVALUE2b(payload_length_type, datap); datap += x; bytesread += x; } else { payload_datalen = length - bytesread - padding_length; } if (stream_id == wfx->audiostream) { if (*audiobuf == NULL) { /* The first payload can stay where it is */ *audiobuf = datap; *audiobufsize = payload_datalen; } else { /* The second and subsequent payloads in this packet that belong to the audio stream need to be moved to be contiguous with the first payload. */ memmove(*audiobuf + *audiobufsize, datap, payload_datalen); *audiobufsize += payload_datalen; } } datap += payload_datalen; bytesread += payload_datalen; } if (*audiobuf != NULL) return 1; else return 0; } static int get_timestamp(int *duration) { 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; uint32_t bytesread = 0; packet_count++; if (ci->read_filebuf(&tmp8, 1) == 0) { DEBUGF("ASF ERROR (EOF?)\n"); return ASF_ERROR_EOF; } bytesread++; /* TODO: We need a better way to detect endofstream */ if (tmp8 != 0x82) { DEBUGF("Get timestamp: Detected end of stream\n"); return ASF_ERROR_EOF; } 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) { DEBUGF("Detected end of stream 2\n"); return ASF_ERROR_EOF; } if (ci->read_filebuf(&packet_property, 1) == 0) { DEBUGF("Detected end of stream3\n"); return ASF_ERROR_EOF; } bytesread += 2; datalen = GETLEN2b((packet_flags >> 1) & 0x03) + GETLEN2b((packet_flags >> 3) & 0x03) + GETLEN2b((packet_flags >> 5) & 0x03) + 6; if (ci->read_filebuf(data, datalen) == 0) { DEBUGF("Detected end of stream4\n"); 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); /*the get_timestamp function advances us 12-13 bytes past the packet start, need to undo this here so that we stay synced with the packet*/ ci->seek_buffer(ci->curpos-bytesread); return send_time; } /*entry point for seeks*/ static int seek(int ms, asf_waveformatex_t* wfx) { int time, duration, delta, temp, count=0; /*estimate packet number from bitrate*/ int initial_packet = ci->curpos/wfx->packet_size; int packet_num = (((int64_t)ms)*(wfx->bitrate>>3))/wfx->packet_size/1000; int last_packet = ci->id3->filesize / wfx->packet_size; if (packet_num > last_packet) { packet_num = last_packet; } /*calculate byte address of the start of that packet*/ int packet_offset = packet_num*wfx->packet_size; /*seek to estimated packet*/ ci->seek_buffer(ci->id3->first_frame_offset+packet_offset); temp = ms; while (1) { /*for very large files it can be difficult and unimportant to find the exact packet*/ count++; /*check the time stamp of our packet*/ time = get_timestamp(&duration); DEBUGF("seeked to %d ms with duration %d\n", time, duration); if (time < 0) { /*unknown error, try to recover*/ DEBUGF("UKNOWN SEEK ERROR\n"); ci->seek_buffer(ci->id3->first_frame_offset+initial_packet*wfx->packet_size); /*seek failed so return time stamp of the initial packet*/ return get_timestamp(&duration); } if ((time+duration>=ms && time<=ms) || count > 10) { DEBUGF("Found our packet! Now at %d packet\n", packet_num); return time; } else { /*seek again*/ delta = ms-time; /*estimate new packet number from bitrate and our current position*/ temp += delta; packet_num = ((temp/1000)*(wfx->bitrate>>3) - (wfx->packet_size>>1))/wfx->packet_size; //round down! packet_offset = packet_num*wfx->packet_size; ci->seek_buffer(ci->id3->first_frame_offset+packet_offset); } } } /* 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; int errcount = 0; /* Generic codec initialisation */ ci->configure(CODEC_SET_FILEBUF_WATERMARK, 1024*512); ci->configure(DSP_SET_SAMPLE_DEPTH, 30); 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; } DEBUGF("**************** IN WMA.C ******************\n"); 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 = 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_INTERLEAVED); 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 = 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, decoded, 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(decoded, NULL, 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; }