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rockbox/apps/codecs/wma.c

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/***************************************************************************
* __________ __ ___.
* 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
/* The output buffer containing the decoded samples (channels 0 and 1)
BLOCK_MAX_SIZE is 2048 (samples) and MAX_CHANNELS is 2.
*/
static uint16_t decoded[BLOCK_MAX_SIZE * MAX_CHANNELS];
/* NOTE: WMADecodeContext is 142688 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(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 i;
int wmares, res, padding;
/* 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;
}
/* 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);
wma_decode_superframe_init(&wmadec,
inbuffer,res - padding);
for (i=0; i < wmadec.nb_frames; i++)
{
wmares = wma_decode_superframe_frame(&wmadec,
decoded,
inbuffer,res - padding);
ci->yield ();
if (wmares < 0)
{
LOGF("WMA decode error %d\n",wmares);
goto done;
} else if (wmares > 0) {
ci->pcmbuf_insert(decoded, NULL, wmares);
samplesdone += wmares;
elapsedtime = (samplesdone*10)/(wfx.rate/100);
ci->set_elapsed(elapsedtime);
}
ci->yield ();
}
ci->advance_buffer(res);
}
}
retval = CODEC_OK;
done:
LOGF("WMA: Decoded %ld samples\n",samplesdone);
if (ci->request_next_track())
goto next_track;
exit:
return retval;
}
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