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avoid link-time dependency to libavcodec

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it has lots of lots of deps, and we want to run on barebone systems
This commit is contained in:
notaz 2013-07-02 03:00:34 +03:00
parent fc11dd059b
commit 986d60fc60
2 changed files with 53 additions and 4 deletions
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49
platform/common/mp3_libavcodec.c
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@ -10,6 +10,7 @@
#include <stdio.h>
#include <string.h>
#include <libavcodec/avcodec.h>
#include <dlfcn.h>
#include <pico/pico_int.h>
#include "../libpicofe/lprintf.h"
@ -17,6 +18,12 @@
static AVCodecContext *ctx;
/* avoid compile time linking to libavcodec due to huge list of it's deps..
* we also use this old API as newer one is not available on pandora */
void (*p_av_init_packet)(AVPacket *pkt);
int (*p_avcodec_decode_audio3)(AVCodecContext *avctx, int16_t *samples,
int *frame_size_ptr, AVPacket *avpkt);
int mp3dec_decode(FILE *f, int *file_pos, int file_len)
{
unsigned char input_buf[2 * 1024];
@ -27,7 +34,7 @@ int mp3dec_decode(FILE *f, int *file_pos, int file_len)
int offset;
int len;
av_init_packet(&avpkt);
p_av_init_packet(&avpkt);
do
{
@ -60,8 +67,13 @@ int mp3dec_decode(FILE *f, int *file_pos, int file_len)
avpkt.data = input_buf + offset;
avpkt.size = frame_size;
bytes_out = sizeof(cdda_out_buffer);
#if LIBAVCODEC_VERSION_MAJOR < 53
// stupidity in v52: enforces this size even when
// it doesn't need/use that much at all
bytes_out = AVCODEC_MAX_AUDIO_FRAME_SIZE;
#endif
len = avcodec_decode_audio3(ctx, cdda_out_buffer,
len = p_avcodec_decode_audio3(ctx, cdda_out_buffer,
&bytes_out, &avpkt);
if (len <= 0) {
lprintf("mp3 decode err (%i/%i) %i\n",
@ -81,12 +93,45 @@ int mp3dec_decode(FILE *f, int *file_pos, int file_len)
int mp3dec_start(void)
{
void (*avcodec_register_all)(void);
AVCodec *(*avcodec_find_decoder)(enum CodecID id);
AVCodecContext *(*avcodec_alloc_context)(void);
int (*avcodec_open)(AVCodecContext *avctx, AVCodec *codec);
void (*av_free)(void *ptr);
AVCodec *codec;
void *soh;
int ret;
if (ctx != NULL)
return 0;
// either v52 or v53 should be ok
soh = dlopen("libavcodec.so.52", RTLD_NOW);
if (soh == NULL)
soh = dlopen("libavcodec.so.53", RTLD_NOW);
if (soh == NULL) {
lprintf("mp3dec: load libavcodec.so: %s\n", dlerror());
return -1;
}
avcodec_register_all = dlsym(soh, "avcodec_register_all");
avcodec_find_decoder = dlsym(soh, "avcodec_find_decoder");
avcodec_alloc_context = dlsym(soh, "avcodec_alloc_context");
avcodec_open = dlsym(soh, "avcodec_open");
av_free = dlsym(soh, "av_free");
p_av_init_packet = dlsym(soh, "av_init_packet");
p_avcodec_decode_audio3 = dlsym(soh, "avcodec_decode_audio3");
if (avcodec_register_all == NULL || avcodec_find_decoder == NULL
|| avcodec_alloc_context == NULL || avcodec_open == NULL
|| av_free == NULL
|| p_av_init_packet == NULL || p_avcodec_decode_audio3 == NULL)
{
lprintf("mp3dec: missing symbol(s) in libavcodec.so\n");
dlclose(soh);
return -1;
}
// init decoder
//avcodec_init();