354770088e
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@11368 a1c6a512-1295-4272-9138-f99709370657
350 lines
10 KiB
C
350 lines
10 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Dave Chapman
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "codeclib.h"
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#include <codecs/libffmpegFLAC/decoder.h>
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CODEC_HEADER
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#ifdef USE_IRAM
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extern char iramcopy[];
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extern char iramstart[];
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extern char iramend[];
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extern char iedata[];
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extern char iend[];
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#endif
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struct codec_api* rb;
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struct codec_api* ci;
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/* The output buffers containing the decoded samples (channels 0 and 1) */
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int32_t decoded0[MAX_BLOCKSIZE] IBSS_ATTR;
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int32_t decoded1[MAX_BLOCKSIZE] IBSS_ATTR;
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#define MAX_SUPPORTED_SEEKTABLE_SIZE 5000
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/* Notes about seeking:
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The full seek table consists of:
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uint64_t sample (only 36 bits are used)
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uint64_t offset
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uint32_t blocksize
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We don't store the blocksize (of the target frame) and we also
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limit the sample and offset values to 32-bits - Rockbox doesn't support
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files bigger than 2GB on FAT32 filesystems.
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The reference FLAC encoder produces a seek table with points every
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10 seconds, but this can be overridden by the user when encoding a file.
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With the default settings, a typical 4 minute track will contain
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24 seek points.
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Taking the extreme case of a Rockbox supported file to be a 2GB (compressed)
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16-bit/44.1KHz mono stream with a likely uncompressed size of 4GB:
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Total duration is: 48694 seconds (about 810 minutes - 13.5 hours)
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Total number of seek points: 4869
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Therefore we limit the number of seek points to 5000. This is a
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very extreme case, and requires 5000*8=40000 bytes of storage.
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If we come across a FLAC file with more than this number of seekpoints, we
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just use the first 5000.
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*/
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struct FLACseekpoints {
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uint32_t sample;
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uint32_t offset;
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};
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struct FLACseekpoints seekpoints[MAX_SUPPORTED_SEEKTABLE_SIZE];
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int nseekpoints;
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static bool flac_init(FLACContext* fc, int first_frame_offset)
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{
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unsigned char buf[255];
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bool found_streaminfo=false;
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uint32_t seekpoint_hi,seekpoint_lo;
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uint32_t offset_hi,offset_lo;
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int endofmetadata=0;
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int blocklength;
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int n;
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ci->memset(fc,0,sizeof(FLACContext));
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nseekpoints=0;
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/* Skip any foreign tags at start of file */
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ci->seek_buffer(first_frame_offset);
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fc->metadatalength = first_frame_offset;
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if (ci->read_filebuf(buf, 4) < 4)
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{
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return false;
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}
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if (ci->memcmp(buf,"fLaC",4) != 0)
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{
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return false;
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}
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fc->metadatalength += 4;
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while (!endofmetadata) {
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if (ci->read_filebuf(buf, 4) < 4)
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{
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return false;
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}
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endofmetadata=(buf[0]&0x80);
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blocklength = (buf[1] << 16) | (buf[2] << 8) | buf[3];
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fc->metadatalength+=blocklength+4;
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if ((buf[0] & 0x7f) == 0) /* 0 is the STREAMINFO block */
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{
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/* FIXME: Don't trust the value of blocklength, use actual return
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* value in bytes instead */
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ci->read_filebuf(buf, blocklength);
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fc->filesize = ci->filesize;
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fc->min_blocksize = (buf[0] << 8) | buf[1];
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fc->max_blocksize = (buf[2] << 8) | buf[3];
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fc->min_framesize = (buf[4] << 16) | (buf[5] << 8) | buf[6];
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fc->max_framesize = (buf[7] << 16) | (buf[8] << 8) | buf[9];
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fc->samplerate = (buf[10] << 12) | (buf[11] << 4)
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| ((buf[12] & 0xf0) >> 4);
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fc->channels = ((buf[12]&0x0e)>>1) + 1;
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fc->bps = (((buf[12]&0x01) << 4) | ((buf[13]&0xf0)>>4) ) + 1;
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/* totalsamples is a 36-bit field, but we assume <= 32 bits are
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used */
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fc->totalsamples = (buf[14] << 24) | (buf[15] << 16)
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| (buf[16] << 8) | buf[17];
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/* Calculate track length (in ms) and estimate the bitrate
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(in kbit/s) */
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fc->length = (fc->totalsamples / fc->samplerate) * 1000;
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found_streaminfo=true;
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} else if ((buf[0] & 0x7f) == 3) { /* 3 is the SEEKTABLE block */
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while ((nseekpoints < MAX_SUPPORTED_SEEKTABLE_SIZE) &&
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(blocklength >= 18)) {
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n=ci->read_filebuf(buf,18);
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if (n < 18) return false;
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blocklength-=n;
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seekpoint_hi=(buf[0] << 24) | (buf[1] << 16) |
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(buf[2] << 8) | buf[3];
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seekpoint_lo=(buf[4] << 24) | (buf[5] << 16) |
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(buf[6] << 8) | buf[7];
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offset_hi=(buf[8] << 24) | (buf[9] << 16) |
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(buf[10] << 8) | buf[11];
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offset_lo=(buf[12] << 24) | (buf[13] << 16) |
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(buf[14] << 8) | buf[15];
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/* The final two bytes contain the number of samples in the
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target frame - but we don't care about that. */
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/* Only store seekpoints where the high 32 bits are zero */
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if ((seekpoint_hi == 0) && (seekpoint_lo != 0xffffffff) &&
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(offset_hi == 0)) {
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seekpoints[nseekpoints].sample=seekpoint_lo;
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seekpoints[nseekpoints].offset=offset_lo;
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nseekpoints++;
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}
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}
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/* Skip any unread seekpoints */
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if (blocklength > 0)
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ci->advance_buffer(blocklength);
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} else {
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/* Skip to next metadata block */
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ci->advance_buffer(blocklength);
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}
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}
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if (found_streaminfo) {
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fc->bitrate = ((fc->filesize-fc->metadatalength) * 8) / fc->length;
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return true;
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} else {
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return false;
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}
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}
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/* A very simple seek implementation - seek to the seekpoint before
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the target sample.
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This needs to be improved to seek with greater accuracy
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*/
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bool flac_seek(FLACContext* fc, uint32_t newsample) {
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uint32_t offset;
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if (nseekpoints==0) {
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/* No seekpoints = no seeking */
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return false;
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} else {
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int i=nseekpoints-1;
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while ((i > 0) && (seekpoints[i].sample > newsample)) {
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i--;
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}
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if ((i==0) && (seekpoints[i].sample > newsample)) {
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offset=0;
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} else {
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offset=seekpoints[i].offset;
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}
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}
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return ci->seek_buffer(offset+fc->metadatalength);
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}
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/* A very simple seek implementation - seek to the seekpoint before
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the target offset.
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This needs to be improved to seek with greater accuracy
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*/
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bool flac_seek_offset(FLACContext* fc, uint32_t offset) {
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if (nseekpoints==0) {
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/* No seekpoints = no seeking */
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return false;
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} else {
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offset-=fc->metadatalength;
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int i=nseekpoints-1;
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while ((i > 0) && (seekpoints[i].offset > offset)) {
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i--;
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}
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if ((i==0) && (seekpoints[i].offset > offset)) {
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offset=0;
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} else {
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offset=seekpoints[i].offset;
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}
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}
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return ci->seek_buffer(offset+fc->metadatalength);
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}
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/* this is the codec entry point */
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enum codec_status codec_start(struct codec_api* api)
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{
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int8_t *buf;
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FLACContext fc;
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uint32_t samplesdone = 0;
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uint32_t elapsedtime;
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size_t bytesleft;
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int consumed;
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int res;
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int frame;
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int retval;
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/* Generic codec initialisation */
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rb = api;
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ci = api;
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#ifdef USE_IRAM
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ci->memcpy(iramstart, iramcopy, iramend-iramstart);
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ci->memset(iedata, 0, iend - iedata);
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#endif
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ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(1024*512));
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ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*128));
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ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_NONINTERLEAVED);
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ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(FLAC_OUTPUT_DEPTH-1));
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next_track:
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/* Need to save offset for later use (cleared indirectly by flac_init) */
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samplesdone=ci->id3->offset;
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if (codec_init(api)) {
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LOGF("FLAC: Error initialising codec\n");
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retval = CODEC_ERROR;
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goto exit;
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}
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if (!flac_init(&fc,ci->id3->first_frame_offset)) {
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LOGF("FLAC: Error initialising codec\n");
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retval = CODEC_ERROR;
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goto done;
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}
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while (!*ci->taginfo_ready && !ci->stop_codec)
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ci->sleep(1);
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ci->configure(DSP_SET_FREQUENCY, (long *)(ci->id3->frequency));
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codec_set_replaygain(ci->id3);
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if (samplesdone) {
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flac_seek_offset(&fc, samplesdone);
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samplesdone=0;
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}
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/* The main decoding loop */
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frame=0;
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buf = ci->request_buffer(&bytesleft, MAX_FRAMESIZE);
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while (bytesleft) {
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ci->yield();
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if (ci->stop_codec || ci->new_track) {
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break;
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}
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/* Deal with any pending seek requests */
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if (ci->seek_time) {
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if (flac_seek(&fc,((ci->seek_time-1)/20)*(ci->id3->frequency/50))) {
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/* Refill the input buffer */
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buf = ci->request_buffer(&bytesleft, MAX_FRAMESIZE);
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}
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ci->seek_complete();
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}
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if((res=flac_decode_frame(&fc,decoded0,decoded1,buf,
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bytesleft,ci->yield)) < 0) {
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LOGF("FLAC: Frame %d, error %d\n",frame,res);
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retval = CODEC_ERROR;
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goto done;
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}
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consumed=fc.gb.index/8;
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frame++;
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ci->yield();
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while(!ci->pcmbuf_insert_split((char*)decoded0,(char*)decoded1,
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fc.blocksize*4)) {
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ci->yield();
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}
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/* Update the elapsed-time indicator */
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samplesdone=fc.samplenumber+fc.blocksize;
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elapsedtime=(samplesdone*10)/(ci->id3->frequency/100);
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ci->set_elapsed(elapsedtime);
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ci->advance_buffer(consumed);
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buf = ci->request_buffer(&bytesleft, MAX_FRAMESIZE);
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}
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retval = CODEC_OK;
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done:
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LOGF("FLAC: Decoded %d samples\n",samplesdone);
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if (ci->request_next_track())
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goto next_track;
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exit:
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return retval;
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}
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