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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "libaf/af_format.h"
#include "ad_internal.h"
#include "libmpdemux/mp3_hdr.h"
//based on ad_hwac3.c and ad_libmad.c
static int isdts = -1;
static ad_info_t info =
{
"MPEG audio pass-through (fake decoder)",
"hwmpa",
"NicoDVB",
"NicoDVB",
"For hardware decoders"
};
LIBAD_EXTERN(hwmpa)
static int mpa_sync(sh_audio_t *sh, int no_frames, int *n, int *chans, int *srate, int *spf, int *mpa_layer, int *br)
{
int cnt = 0, x = 0, len, frames_count;
frames_count = 0;
do
{
while(cnt + 4 < sh->a_in_buffer_len)
{
if(((sh->a_in_buffer[cnt] << 8) | sh->a_in_buffer[cnt+1]) & 0xffe0 != 0xffe0)
continue;
x = mp_get_mp3_header(&(sh->a_in_buffer[cnt]), chans, srate, spf, mpa_layer, br);
if(x > 0)
{
frames_count++;
if(frames_count == no_frames)
{
*n = x;
return cnt;
}
}
cnt++;
}
len = demux_read_data(sh->ds,&sh->a_in_buffer[sh->a_in_buffer_len],sh->a_in_buffer_size-sh->a_in_buffer_len);
if(len > 0)
sh->a_in_buffer_len += len;
} while(len > 0);
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"Cannot sync MPA frame: %d\r\n", len);
return -1;
}
static int preinit(sh_audio_t *sh)
{
sh->audio_out_minsize = 48;//check
sh->audio_in_minsize = 4608;//check
sh->sample_format = AF_FORMAT_MPEG2;
return 1;
}
static int init(sh_audio_t *sh)
{
int cnt, chans, srate, spf, mpa_layer, br, len;
if((cnt = mpa_sync(sh, 1, &len, &chans, &srate, &spf, &mpa_layer, &br)) < 0)
return 0;
sh->channels = chans;
sh->samplerate = srate;
sh->i_bps = br * 125;
sh->samplesize = 2;
mp_msg(MSGT_DECAUDIO,MSGL_V,"AC_HWMPA initialized, bitrate: %d kb/s\r\n", len);
return 1;
}
static int decode_audio(sh_audio_t *sh,unsigned char *buf,int minlen,int maxlen)
{
int len, start, cnt2, tot;
int chans, srate, spf, mpa_layer, br;
tot = cnt2 = 0;
while(tot < minlen && tot+4608<=maxlen)
{
start = mpa_sync(sh, 1, &len, &chans, &srate, &spf, &mpa_layer, &br);
if(start < 0)
break;
if(start + len < sh->a_in_buffer_len && start + len >= maxlen)
break;
memcpy(&buf[cnt2], &(sh->a_in_buffer[start]), len);
cnt2 += len;
sh->a_in_buffer_len -= start + len;
memmove(sh->a_in_buffer, &(sh->a_in_buffer[start + len]), sh->a_in_buffer_len);
tot += start + len;
}
return tot;
}
static int control(sh_audio_t *sh,int cmd,void* arg, ...)
{
int start, len, n;
switch(cmd)
{
case ADCTRL_RESYNC_STREAM:
if(mpa_sync(sh, 1, &len, NULL, NULL, NULL, NULL, NULL) >= 0)
return CONTROL_TRUE;
else
return CONTROL_FALSE;
case ADCTRL_SKIP_FRAME:
start = mpa_sync(sh, 2, &len, NULL, NULL, NULL, NULL, NULL);
if(len < 0)
return CONTROL_FALSE;
sh->a_in_buffer_len -= start;
memmove(sh->a_in_buffer, &(sh->a_in_buffer[start]), sh->a_in_buffer_len);
return CONTROL_TRUE;
}
return CONTROL_UNKNOWN;
}
static void uninit(sh_audio_t *sh)
{
}
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