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mpv/libmpdemux/demux_audio.c

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#include "config.h"
#include "../mp_msg.h"
#include <stdlib.h>
#include <stdio.h>
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "genres.h"
#include <string.h>
#ifdef MP_DEBUG
#include <assert.h>
#endif
#define MP3 1
#define WAV 2
#define HDR_SIZE 4
typedef struct da_priv {
int frmt;
float last_pts;
} da_priv_t;
extern int mp_decode_mp3_header(unsigned char* hbuf);
extern void free_sh_audio(sh_audio_t* sh);
extern void resync_audio_stream(sh_audio_t *sh_audio);
static int hr_mp3_seek = 0;
int demux_audio_open(demuxer_t* demuxer) {
stream_t *s;
sh_audio_t* sh_audio;
uint8_t hdr[HDR_SIZE];
int st_pos = 0,frmt = 0, n = 0, pos = 0, step;
da_priv_t* priv;
#ifdef MP_DEBUG
assert(demuxer != NULL);
assert(demuxer->stream != NULL);
#endif
s = demuxer->stream;
while(n < 5 && ! s->eof) {
st_pos = stream_tell(s);
step = 1;
if(pos < HDR_SIZE) {
stream_read(s,&hdr[pos],HDR_SIZE-pos);
pos = HDR_SIZE;
}
if( hdr[0] == 'R' && hdr[1] == 'I' && hdr[2] == 'F' && hdr[3] == 'F' ) {
stream_skip(s,4);
if(s->eof)
break;
stream_read(s,hdr,4);
if(s->eof)
break;
if(hdr[0] != 'W' || hdr[1] != 'A' || hdr[2] != 'V' || hdr[3] != 'E' )
stream_skip(s,-8);
else
// We found wav header. Now we can have 'fmt ' or a mp3 header
// empty the buffer
step = 4;
} else if( hdr[0] == 'f' && hdr[1] == 'm' && hdr[2] == 't' && hdr[3] == ' ' ) {
frmt = WAV;
break;
} else if((n = mp_decode_mp3_header(hdr)) > 0) {
frmt = MP3;
break;
}
// Add here some other audio format detection
if(step < HDR_SIZE)
memmove(hdr,&hdr[step],HDR_SIZE-step);
pos -= step;
}
if(!frmt)
return 0;
sh_audio = new_sh_audio(demuxer,0);
switch(frmt) {
case MP3:
sh_audio->format = 0x55;
demuxer->movi_start = st_pos-HDR_SIZE+n;
for(n = 0; n < 5 ; n++) {
pos = mp_decode_mp3_header(hdr);
if(pos < 0)
return 0;
stream_skip(s,pos-4);
if(s->eof)
return 0;
stream_read(s,hdr,4);
if(s->eof)
return 0;
}
if(s->end_pos) {
char tag[4];
stream_seek(s,s->end_pos-128);
stream_read(s,tag,3);
tag[3] = '\0';
if(strcmp(tag,"TAG"))
demuxer->movi_end = s->end_pos;
else {
char buf[31];
uint8_t g;
demuxer->movi_end = stream_tell(s)-3;
stream_read(s,buf,30);
buf[30] = '\0';
demux_info_add(demuxer,"Title",buf);
stream_read(s,buf,30);
buf[30] = '\0';
demux_info_add(demuxer,"Artist",buf);
stream_read(s,buf,30);
buf[30] = '\0';
demux_info_add(demuxer,"Album",buf);
stream_read(s,buf,4);
buf[4] = '\0';
demux_info_add(demuxer,"Year",buf);
stream_read(s,buf,30);
buf[30] = '\0';
demux_info_add(demuxer,"Comment",buf);
if(buf[28] == 0 && buf[29] != 0) {
uint8_t trk = (uint8_t)buf[29];
sprintf(buf,"%d",trk);
demux_info_add(demuxer,"Track",buf);
}
g = stream_read_char(s);
demux_info_add(demuxer,"Genre",genres[g]);
}
}
break;
case WAV: {
unsigned int chunk_type;
unsigned int chunk_size;
WAVEFORMATEX* w;
int l;
sh_audio->wf = w = (WAVEFORMATEX*)malloc(sizeof(WAVEFORMATEX));
l = stream_read_dword_le(s);
if(l < 16) {
printf("Bad wav header length : too short !!!\n");
free_sh_audio(sh_audio);
return 0;
}
w->wFormatTag = sh_audio->format = stream_read_word_le(s);
w->nChannels = sh_audio->channels = stream_read_word_le(s);
w->nSamplesPerSec = sh_audio->samplerate = stream_read_dword_le(s);
w->nAvgBytesPerSec = stream_read_dword_le(s);
w->nBlockAlign = stream_read_word_le(s);
w->wBitsPerSample = sh_audio->samplesize = stream_read_word_le(s);
w->cbSize = 0;
l -= 16;
if(l)
stream_skip(s,l);
do
{
chunk_type = stream_read_fourcc(demuxer->stream);
chunk_size = stream_read_dword_le(demuxer->stream);
if (chunk_type != mmioFOURCC('d', 'a', 't', 'a'))
stream_skip(demuxer->stream, chunk_size);
} while (chunk_type != mmioFOURCC('d', 'a', 't', 'a'));
demuxer->movi_start = stream_tell(s);
demuxer->movi_end = s->end_pos;
} break;
}
priv = (da_priv_t*)malloc(sizeof(da_priv_t));
priv->frmt = frmt;
priv->last_pts = -1;
demuxer->priv = priv;
demuxer->audio->id = 0;
demuxer->audio->sh = sh_audio;
sh_audio->ds = demuxer->audio;
if(stream_tell(s) != demuxer->movi_start)
stream_seek(s,demuxer->movi_start);
mp_msg(MSGT_DEMUX,MSGL_V,"demux_audio: audio data 0x%X - 0x%X \n",demuxer->movi_start,demuxer->movi_end);
return 1;
}
int demux_audio_fill_buffer(demux_stream_t *ds) {
sh_audio_t* sh_audio;
demuxer_t* demux;
da_priv_t* priv;
stream_t* s;
#ifdef MP_DEBUG
assert(ds != NULL);
assert(ds->sh != NULL);
assert(ds->demuxer != NULL);
#endif
sh_audio = ds->sh;
demux = ds->demuxer;
priv = demux->priv;
s = demux->stream;
if(s->eof || (demux->movi_end && stream_tell(s) >= demux->movi_end) )
return 0;
switch(priv->frmt) {
case MP3 :
while(! s->eof || (demux->movi_end && stream_tell(s) >= demux->movi_end) ) {
uint8_t hdr[4];
int len;
stream_read(s,hdr,4);
len = mp_decode_mp3_header(hdr);
if(len < 0) {
stream_skip(s,-3);
} else {
demux_packet_t* dp;
if(s->eof || (demux->movi_end && stream_tell(s) >= demux->movi_end) )
return 0;
dp = new_demux_packet(len);
memcpy(dp->buffer,hdr,4);
stream_read(s,dp->buffer + 4,len-4);
priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + 1152/(float)sh_audio->samplerate;
ds->pts = priv->last_pts - (ds_tell_pts(demux->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
ds_add_packet(ds,dp);
return 1;
}
} break;
case WAV : {
int l = sh_audio->wf->nAvgBytesPerSec;
demux_packet_t* dp = new_demux_packet(l);
stream_read(s,dp->buffer,l);
priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + l/(float)sh_audio->i_bps;
ds->pts = priv->last_pts - (ds_tell_pts(demux->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
ds_add_packet(ds,dp);
return 1;
}
default:
printf("Audio demuxer : unknown format %d\n",priv->frmt);
}
return 0;
}
static void high_res_mp3_seek(demuxer_t *demuxer,float time) {
uint8_t hdr[4];
int len,nf;
da_priv_t* priv = demuxer->priv;
sh_audio_t* sh = (sh_audio_t*)demuxer->audio->sh;
nf = time*sh->samplerate/1152;
while(nf > 0) {
stream_read(demuxer->stream,hdr,4);
len = mp_decode_mp3_header(hdr);
if(len < 0) {
stream_skip(demuxer->stream,-3);
continue;
}
stream_skip(demuxer->stream,len-4);
priv->last_pts += 1152/(float)sh->samplerate;
nf--;
}
}
void demux_audio_seek(demuxer_t *demuxer,float rel_seek_secs,int flags){
sh_audio_t* sh_audio;
stream_t* s;
int base,pos;
float len;
da_priv_t* priv;
if(!(sh_audio = demuxer->audio->sh))
return;
s = demuxer->stream;
priv = demuxer->priv;
if(priv->frmt == MP3 && hr_mp3_seek && !(flags & 2)) {
len = (flags & 1) ? rel_seek_secs - priv->last_pts : rel_seek_secs;
if(len < 0) {
stream_seek(s,demuxer->movi_start);
len = priv->last_pts + len;
priv->last_pts = 0;
}
if(len > 0)
high_res_mp3_seek(demuxer,len);
sh_audio->timer = priv->last_pts - (ds_tell_pts(demuxer->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
resync_audio_stream(sh_audio);
return;
}
base = flags&1 ? demuxer->movi_start : stream_tell(s) ;
len = (demuxer->movi_end && flags&2) ? (demuxer->movi_end - demuxer->movi_start)*rel_seek_secs : rel_seek_secs;
pos = base+(len*sh_audio->i_bps);
if(demuxer->movi_end && pos >= demuxer->movi_end) {
sh_audio->timer = (stream_tell(s) - demuxer->movi_start)/(float)sh_audio->i_bps;
return;
} else if(pos < demuxer->movi_start)
pos = demuxer->movi_start;
priv->last_pts = (pos-demuxer->movi_start)/(float)sh_audio->i_bps;
sh_audio->timer = priv->last_pts - (ds_tell_pts(demuxer->audio)-sh_audio->a_in_buffer_len)/(float)sh_audio->i_bps;
switch(priv->frmt) {
case WAV:
pos -= (pos % (sh_audio->channels * sh_audio->samplesize) );
// We need to decrease the pts by one step to make it the "last one"
priv->last_pts -= sh_audio->wf->nAvgBytesPerSec/(float)sh_audio->i_bps;
break;
}
stream_seek(s,pos);
resync_audio_stream(sh_audio);
}
/****************** Options stuff ******************/
#include "../cfgparser.h"
static config_t demux_audio_opts[] = {
{ "hr-mp3-seek", &hr_mp3_seek, CONF_TYPE_FLAG, 0, 0, 1, NULL },
{ "nohr-mp3-seek", &hr_mp3_seek, CONF_TYPE_FLAG, 0, 1, 0, NULL},
{NULL, NULL, 0, 0, 0, 0, NULL}
};
void demux_audio_register_options(m_config_t* cfg) {
m_config_register_options(cfg,demux_audio_opts);
}
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