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rockbox/apps/codecs/mpa.c
Magnus Holmgren 15e0aeb73b More complete gapless playback implementation in the MP3 codec (using LAME header values). Some cleanups as well. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7312 a1c6a512-1295-4272-9138-f99709370657
2005-08-13 08:02:38 +00:00

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9.1 KiB
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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 "codec.h"
#include <codecs/libmad/mad.h>
#include "playback.h"
#include "dsp.h"
#include "lib/codeclib.h"
#include "system.h"
struct mad_stream Stream IDATA_ATTR;
struct mad_frame Frame IDATA_ATTR;
struct mad_synth Synth IDATA_ATTR;
mad_timer_t Timer;
/* The following function is used inside libmad - let's hope it's never
called.
*/
void abort(void) {
}
#define INPUT_CHUNK_SIZE 8192
mad_fixed_t mad_frame_overlap[2][32][18] IDATA_ATTR;
unsigned char mad_main_data[MAD_BUFFER_MDLEN] IDATA_ATTR;
/* TODO: what latency does layer 1 have? */
int mpeg_latency[3] = { 0, 481, 529 };
#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
#endif
struct codec_api *ci;
unsigned int samplecount;
unsigned int samplesdone;
int stop_skip, start_skip;
int current_stereo_mode = -1;
int frequency_divider;
unsigned int current_frequency = 0;
void recalc_samplecount(void)
{
/* NOTE: currently this doesn't work, the below calculated samples_count
seems to be right, but sometimes we just don't have all the data we
need... */
if (ci->id3->frame_count) {
/* TODO: 1152 is the frame size in samples for MPEG1 layer 2 and layer 3,
it's probably not correct at all for MPEG2 and layer 1 */
samplecount = ci->id3->frame_count*1152 - (start_skip + stop_skip);
} else {
samplecount = ci->id3->length * frequency_divider / 10;
}
}
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api* api)
{
int Status = 0;
size_t size;
int file_end;
int frame_skip;
char *InputBuffer;
ci = api;
/* Generic codec inititialisation */
TEST_CODEC_API(api);
#ifdef USE_IRAM
ci->memcpy(iramstart, iramcopy, iramend - iramstart);
#endif
/* This function sets up the buffers and reads the file into RAM */
if (codec_init(api)) {
return CODEC_ERROR;
}
/* Create a decoder instance */
ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*2));
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*16));
ci->configure(DSP_SET_CLIP_MIN, (int *)-MAD_F_ONE);
ci->configure(DSP_SET_CLIP_MAX, (int *)(MAD_F_ONE - 1));
ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(MAD_F_FRACBITS));
ci->configure(DSP_DITHER, (bool *)false);
ci->configure(CODEC_DSP_ENABLE, (bool *)true);
ci->memset(&Stream, 0, sizeof(struct mad_stream));
ci->memset(&Frame, 0, sizeof(struct mad_frame));
ci->memset(&Synth, 0, sizeof(struct mad_synth));
ci->memset(&Timer, 0, sizeof(mad_timer_t));
#if defined(CPU_COLDFIRE) && !defined(SIMULATOR)
mcf5249_init_mac();
#endif
mad_stream_init(&Stream);
mad_frame_init(&Frame);
mad_synth_init(&Synth);
mad_timer_reset(&Timer);
/* We do this so libmad doesn't try to call codec_calloc() */
memset(mad_frame_overlap, 0, sizeof(mad_frame_overlap));
Frame.overlap = &mad_frame_overlap;
Stream.main_data = &mad_main_data;
/* This label might need to be moved above all the init code, but I don't
think reiniting the codec is necessary for MPEG. It might even be unwanted
for gapless playback */
next_track:
file_end = 0;
while (!*ci->taginfo_ready && !ci->stop_codec)
ci->sleep(1);
frequency_divider = ci->id3->frequency / 100;
if (frequency_divider <= 0)
frequency_divider = 441;
ci->configure(DSP_SET_FREQUENCY, (int *)ci->id3->frequency);
current_frequency = ci->id3->frequency;
codec_set_replaygain(ci->id3);
ci->request_buffer(&size, ci->id3->first_frame_offset);
ci->advance_buffer(size);
if (ci->id3->lead_trim >= 0 && ci->id3->tail_trim >= 0) {
stop_skip = ci->id3->tail_trim - mpeg_latency[ci->id3->layer];
if (stop_skip < 0) stop_skip = 0;
start_skip = ci->id3->lead_trim + mpeg_latency[ci->id3->layer];
} else {
stop_skip = 0;
/* We want to skip this amount anyway */
start_skip = mpeg_latency[ci->id3->layer];
}
samplesdone = ci->id3->elapsed * frequency_divider / 10;
frame_skip = start_skip;
recalc_samplecount();
/* This is the decoding loop. */
while (1) {
int framelength;
ci->yield();
if (ci->stop_codec || ci->reload_codec) {
break ;
}
if (ci->seek_time) {
int newpos;
samplesdone = (ci->seek_time-1) * frequency_divider / 10;
newpos = ci->mp3_get_filepos(ci->seek_time-1);
if (!ci->seek_buffer(newpos)) {
goto next_track;
}
ci->seek_time = 0;
if (newpos == 0) frame_skip = start_skip;
}
/* Lock buffers */
if (Stream.error == 0) {
InputBuffer = ci->request_buffer(&size, INPUT_CHUNK_SIZE);
if (size == 0 || InputBuffer == NULL)
break ;
mad_stream_buffer(&Stream, InputBuffer, size);
}
if(mad_frame_decode(&Frame,&Stream))
{
if (Stream.error == MAD_FLAG_INCOMPLETE || Stream.error == MAD_ERROR_BUFLEN) {
// ci->splash(HZ*1, true, "Incomplete");
/* This makes the codec to support partially corrupted files too. */
if (file_end == 30)
break ;
/* Fill the buffer */
Stream.error = 0;
file_end++;
continue ;
}
else if(MAD_RECOVERABLE(Stream.error))
{
if(Stream.error!=MAD_ERROR_LOSTSYNC)
{
// rb->splash(HZ*1, true, "Recoverable...!");
}
continue;
}
else if(Stream.error==MAD_ERROR_BUFLEN) {
//rb->splash(HZ*1, true, "Buflen error");
break ;
} else {
//rb->splash(HZ*1, true, "Unrecoverable error");
Status=1;
break;
}
break ;
}
file_end = false;
/* ?? Do we need the timer module? */
// mad_timer_add(&Timer,Frame.header.duration);
mad_synth_frame(&Synth,&Frame);
framelength = Synth.pcm.length;
/* Convert MAD's numbers to an array of 16-bit LE signed integers */
/* We skip frame_skip number of samples here, this should only happen for
very first frame in the stream. */
/* TODO: possible for frame_skip to exceed one frames worth of samples? */
if(Frame.header.samplerate != current_frequency) {
current_frequency = Frame.header.samplerate;
frequency_divider = current_frequency / 100;
ci->configure(DSP_SWITCH_FREQUENCY,
(int *)current_frequency);
recalc_samplecount();
}
if (stop_skip > 0)
{
long max = samplecount - samplesdone;
if (max < 0) max = 0;
if (max < framelength) framelength = max;
if (framelength == 0) break;
}
if (MAD_NCHANNELS(&Frame.header) == 2) {
if (current_stereo_mode != STEREO_NONINTERLEAVED) {
ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_NONINTERLEAVED);
current_stereo_mode = STEREO_NONINTERLEAVED;
}
ci->pcmbuf_insert_split(&Synth.pcm.samples[0][frame_skip],
&Synth.pcm.samples[1][frame_skip],
(framelength - frame_skip) * 4);
} else {
if (current_stereo_mode != STEREO_MONO) {
ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_MONO);
current_stereo_mode = STEREO_MONO;
}
ci->pcmbuf_insert((char *)&Synth.pcm.samples[0][frame_skip],
(framelength - frame_skip) * 4);
}
frame_skip = 0;
if (Stream.next_frame)
ci->advance_buffer_loc((void *)Stream.next_frame);
else
ci->advance_buffer(size);
samplesdone += framelength;
ci->set_elapsed(samplesdone / (frequency_divider / 10));
}
Stream.error = 0;
if (ci->request_next_track())
goto next_track;
return CODEC_OK;
}
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