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rockbox/apps/plugins/codecmpa.c
Linus Nielsen Feltzing 1c497e6045 First audio codec playback attempt by Miikka Pekkarinen 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6574 a1c6a512-1295-4272-9138-f99709370657
2005-06-05 23:05:10 +00:00

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9.8 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 "plugin.h"
#include <codecs/libmad/mad.h>
#include "playback.h"
#include "mp3data.h"
#include "lib/codeclib.h"
static struct plugin_api* rb;
struct mad_stream Stream IDATA_ATTR;
struct mad_frame Frame IDATA_ATTR;
struct mad_synth Synth IDATA_ATTR;
mad_timer_t Timer;
struct dither d0, d1;
/* The following function is used inside libmad - let's hope it's never
called.
*/
void abort(void) {
}
/* The "dither" code to convert the 24-bit samples produced by libmad was
taken from the coolplayer project - coolplayer.sourceforge.net */
struct dither {
mad_fixed_t error[3];
mad_fixed_t random;
};
# define SAMPLE_DEPTH 16
# define scale(x, y) dither((x), (y))
/*
* NAME: prng()
* DESCRIPTION: 32-bit pseudo-random number generator
*/
static __inline
unsigned long prng(unsigned long state)
{
return (state * 0x0019660dL + 0x3c6ef35fL) & 0xffffffffL;
}
/*
* NAME: dither()
* DESCRIPTION: dither and scale sample
*/
static __inline
signed int dither(mad_fixed_t sample, struct dither *dither)
{
unsigned int scalebits;
mad_fixed_t output, mask, random;
enum {
MIN = -MAD_F_ONE,
MAX = MAD_F_ONE - 1
};
/* noise shape */
sample += dither->error[0] - dither->error[1] + dither->error[2];
dither->error[2] = dither->error[1];
dither->error[1] = dither->error[0] / 2;
/* bias */
output = sample + (1L << (MAD_F_FRACBITS + 1 - SAMPLE_DEPTH - 1));
scalebits = MAD_F_FRACBITS + 1 - SAMPLE_DEPTH;
mask = (1L << scalebits) - 1;
/* dither */
random = prng(dither->random);
output += (random & mask) - (dither->random & mask);
//dither->random = random;
/* clip */
if (output > MAX) {
output = MAX;
if (sample > MAX)
sample = MAX;
}
else if (output < MIN) {
output = MIN;
if (sample < MIN)
sample = MIN;
}
/* quantize */
output &= ~mask;
/* error feedback */
dither->error[0] = sample - output;
/* scale */
return output >> scalebits;
}
static __inline
signed int detect_silence(mad_fixed_t sample)
{
unsigned int scalebits;
mad_fixed_t output, mask;
enum {
MIN = -MAD_F_ONE,
MAX = MAD_F_ONE - 1
};
/* bias */
output = sample + (1L << (MAD_F_FRACBITS + 1 - SAMPLE_DEPTH - 1));
scalebits = MAD_F_FRACBITS + 1 - SAMPLE_DEPTH;
mask = (1L << scalebits) - 1;
/* clip */
if (output > MAX) {
output = MAX;
if (sample > MAX)
sample = MAX;
}
else if (output < MIN) {
output = MIN;
if (sample < MIN)
sample = MIN;
}
/* quantize */
output &= ~mask;
/* scale */
output >>= scalebits + 4;
if (output == 0x00 || output == 0xff)
return 1;
return 0;
}
#define SHRT_MAX 32767
#define INPUT_CHUNK_SIZE 8192
#define OUTPUT_BUFFER_SIZE 65536 /* Must be an integer multiple of 4. */
unsigned char OutputBuffer[OUTPUT_BUFFER_SIZE];
unsigned char *OutputPtr;
unsigned char *GuardPtr=NULL;
const unsigned char *OutputBufferEnd=OutputBuffer+OUTPUT_BUFFER_SIZE;
mad_fixed_t mad_frame_overlap[2][32][18] IDATA_ATTR;
unsigned char mad_main_data[MAD_BUFFER_MDLEN] IDATA_ATTR;
#ifdef USE_IRAM
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
#endif
#undef DEBUG_GAPLESS
/* this is the plugin entry point */
enum plugin_status plugin_start(struct plugin_api* api, void* parm)
{
struct codec_api *ci = (struct codec_api *)parm;
int Status=0;
size_t size;
int file_end;
unsigned short Sample;
char *InputBuffer;
unsigned int samplecount;
unsigned int samplesdone;
bool first_frame;
#ifdef DEBUG_GAPLESS
bool first = true;
int fd;
#endif
int i;
/* Generic plugin inititialisation */
TEST_PLUGIN_API(api);
rb = api;
#ifdef USE_IRAM
rb->memcpy(iramstart, iramcopy, iramend-iramstart);
#endif
/* This function sets up the buffers and reads the file into RAM */
if (codec_init(api, ci)) {
return PLUGIN_ERROR;
}
/* Create a decoder instance */
next_track:
memset(&Stream, 0, sizeof(struct mad_stream));
memset(&Frame, 0, sizeof(struct mad_frame));
memset(&Synth, 0, sizeof(struct mad_synth));
memset(&Timer, 0, sizeof(mad_timer_t));
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;
#ifdef DEBUG_GAPLESS
if (first)
fd = rb->open("/first.pcm", O_WRONLY | O_CREAT);
else
fd = rb->open("/second.pcm", O_WRONLY | O_CREAT);
first = false;
#endif
samplesdone = 0;
first_frame = false;
file_end = 0;
OutputPtr = OutputBuffer;
while (!*ci->taginfo_ready)
rb->yield();
ci->request_buffer(&size, ci->id3->first_frame_offset);
ci->advance_buffer(size);
samplecount = ci->id3->length * (ci->id3->frequency / 100) / 10;
/* rb->snprintf(buf2, sizeof(buf2), "sc: %d", samplecount);
rb->splash(0, true, buf2);
rb->snprintf(buf2, sizeof(buf2), "length: %d", ci->id3->length);
rb->splash(HZ*5, true, buf2);
rb->snprintf(buf2, sizeof(buf2), "frequency: %d", ci->id3->frequency);
rb->splash(HZ*5, true, buf2); */
/* This is the decoding loop. */
while (1) {
rb->yield();
if (ci->stop_codec || ci->reload_codec) {
break ;
}
if (ci->seek_time) {
unsigned int sample_loc;
int newpos;
sample_loc = ci->seek_time/1000 * ci->id3->frequency;
newpos = ci->mp3_get_filepos(ci->seek_time-1);
if (ci->seek_buffer(newpos)) {
ci->seek_time = 0;
if (sample_loc >= samplecount + samplesdone)
break ;
samplecount += samplesdone - sample_loc;
samplesdone = sample_loc;
}
}
/* 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 ((int)ci->curpos >= ci->id3->first_frame_offset)
//first_frame = true;
if(mad_frame_decode(&Frame,&Stream))
{
if (Stream.error == MAD_FLAG_INCOMPLETE || Stream.error == MAD_ERROR_BUFLEN) {
// rb->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 || Stream.this_frame!=GuardPtr)
{
// 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;
}
}
if (Stream.next_frame)
ci->advance_buffer_loc((void *)Stream.next_frame);
file_end = false;
/* ?? Do we need the timer module? */
// mad_timer_add(&Timer,Frame.header.duration);
/* DAVE: This can be used to attenuate the audio */
// if(DoFilter)
// ApplyFilter(&Frame);
mad_synth_frame(&Synth,&Frame);
//if (!first_frame) {
//samplecount -= Synth.pcm.length;
//continue ;
//}
/* Convert MAD's numbers to an array of 16-bit LE signed integers */
for(i=0;i<Synth.pcm.length;i++)
{
samplesdone++;
//if (ci->mp3data->padding > 0) {
// ci->mp3data->padding--;
// continue ;
//}
if (!first_frame) {
if (detect_silence(Synth.pcm.samples[0][i]))
continue ;
first_frame = true;
}
/* Left channel */
Sample=scale(Synth.pcm.samples[0][i],&d0);
*(OutputPtr++)=Sample>>8;
*(OutputPtr++)=Sample&0xff;
/* Right channel. If the decoded stream is monophonic then
* the right output channel is the same as the left one.
*/
if(MAD_NCHANNELS(&Frame.header)==2)
Sample=scale(Synth.pcm.samples[1][i],&d1);
*(OutputPtr++)=Sample>>8;
*(OutputPtr++)=Sample&0xff;
samplecount--;
if (samplecount == 0) {
#ifdef DEBUG_GAPLESS
rb->write(fd, OutputBuffer, (int)OutputPtr-(int)OutputBuffer);
#endif
while (!ci->audiobuffer_insert(OutputBuffer, (int)OutputPtr-(int)OutputBuffer))
rb->yield();
goto song_end;
}
/* Flush the buffer if it is full. */
if(OutputPtr==OutputBufferEnd)
{
#ifdef DEBUG_GAPLESS
rb->write(fd, OutputBuffer, OUTPUT_BUFFER_SIZE);
#endif
while (!ci->audiobuffer_insert(OutputBuffer, OUTPUT_BUFFER_SIZE))
rb->yield();
OutputPtr=OutputBuffer;
}
}
ci->set_elapsed(samplesdone / (ci->id3->frequency/1000));
}
song_end:
#ifdef DEBUG_GAPLESS
rb->close(fd);
#endif
Stream.error = 0;
if (ci->request_next_track())
goto next_track;
return PLUGIN_OK;
}
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