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make gp2x mp3 playback functional (need to unpack and compile helix decoder separately in platform/common/helix)

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kub 2019-03-18 23:14:07 +01:00 • committed by kub
parent c79d0bb90f
commit 340e528ff8
13 changed files with 274 additions and 59 deletions
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37
platform/common/mp3_helix.c
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@ -9,6 +9,7 @@
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>
#include <pico/pico_int.h>
#include <pico/sound/mix.h>
@ -20,10 +21,15 @@ static HMP3Decoder mp3dec;
static unsigned char mp3_input_buffer[2 * 1024];
#ifdef __GP2X__
#define mp3_update mp3_update_local
#define mp3_start_play mp3_start_play_local
#define mp3dec_decode _mp3dec_decode
#define mp3dec_start _mp3dec_start
#endif
static void *libhelix;
HMP3Decoder (*p_MP3InitDecoder)(void);
void (*p_MP3FreeDecoder)(HMP3Decoder);
int (*p_MP3Decode)(HMP3Decoder, unsigned char **, int *, short *, int);
int mp3dec_decode(FILE *f, int *file_pos, int file_len)
{
unsigned char *readPtr;
@ -51,7 +57,7 @@ int mp3dec_decode(FILE *f, int *file_pos, int file_len)
bytesLeft -= offset;
had_err = err;
err = MP3Decode(mp3dec, &readPtr, &bytesLeft, cdda_out_buffer, 0);
err = p_MP3Decode(mp3dec, &readPtr, &bytesLeft, cdda_out_buffer, 0);
if (err) {
if (err == ERR_MP3_MAINDATA_UNDERFLOW && !had_err) {
// just need another frame
@ -86,10 +92,31 @@ int mp3dec_decode(FILE *f, int *file_pos, int file_len)
int mp3dec_start(FILE *f, int fpos_start)
{
if (libhelix == NULL) {
libhelix = dlopen("./libhelix.so", RTLD_NOW);
if (libhelix == NULL) {
lprintf("mp3dec: load libhelix.so: %s\n", dlerror());
return -1;
}
p_MP3InitDecoder = dlsym(libhelix, "MP3InitDecoder");
p_MP3FreeDecoder = dlsym(libhelix, "MP3FreeDecoder");
p_MP3Decode = dlsym(libhelix, "MP3Decode");
if (p_MP3InitDecoder == NULL || p_MP3FreeDecoder == NULL
|| p_MP3Decode == NULL)
{
lprintf("mp3dec: missing symbol(s) in libhelix.so\n");
dlclose(libhelix);
libhelix = NULL;
return -1;
}
}
// must re-init decoder for new track
if (mp3dec)
MP3FreeDecoder(mp3dec);
mp3dec = MP3InitDecoder();
p_MP3FreeDecoder(mp3dec);
mp3dec = p_MP3InitDecoder();
return (mp3dec == 0) ? -1 : 0;
}