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assign correct tag, dwScale and dwBlockAlign to mpeg audio; optionally assign layer and samples_per_frame when parsing mpa header

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15200 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
nicodvb 2005-04-17 09:42:51 +00:00
parent 1e12bf4d71
commit aa8b3279f9
3 changed files with 25 additions and 12 deletions
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16
libmpdemux/demux_audio.c
View File

@ -117,7 +117,7 @@ int demux_audio_open(demuxer_t* demuxer) {
stream_t *s;
sh_audio_t* sh_audio;
uint8_t hdr[HDR_SIZE];
int frmt = 0, n = 0, step, mp3_freq, mp3_chans, mp3_flen;
int frmt = 0, n = 0, step, mp3_freq, mp3_chans, mp3_flen, mpa_layer = 3, mpa_spf = 1152;
off_t st_pos = 0, next_frame_pos = 0;
// mp3_hdrs list is sorted first by next_frame_pos and then by frame_pos
mp3_hdr_t *mp3_hdrs = NULL, *mp3_found = NULL;
@ -157,7 +157,7 @@ int demux_audio_open(demuxer_t* demuxer) {
} else if( hdr[0] == 'f' && hdr[1] == 'm' && hdr[2] == 't' && hdr[3] == ' ' ) {
frmt = WAV;
break;
} else if((mp3_flen = mp_get_mp3_header(hdr,&mp3_chans,&mp3_freq)) > 0) {
} else if((mp3_flen = mp_get_mp3_header(hdr,&mp3_chans,&mp3_freq,&mpa_spf,&mpa_layer)) > 0) {
mp3_found = add_mp3_hdr(&mp3_hdrs, st_pos, mp3_chans, mp3_freq, mp3_flen);
if (mp3_found) {
frmt = MP3;
@ -184,17 +184,17 @@ int demux_audio_open(demuxer_t* demuxer) {
switch(frmt) {
case MP3:
sh_audio->format = 0x55;
sh_audio->format = (mpa_layer < 3 ? 0x50 : 0x55);
demuxer->movi_start = mp3_found->frame_pos;
next_frame_pos = mp3_found->next_frame_pos;
sh_audio->audio.dwSampleSize= 0;
sh_audio->audio.dwScale = 1152;
sh_audio->audio.dwScale = mpa_spf;
sh_audio->audio.dwRate = mp3_found->mp3_freq;
sh_audio->wf = malloc(sizeof(WAVEFORMATEX));
sh_audio->wf->wFormatTag = sh_audio->format;
sh_audio->wf->nChannels = mp3_found->mp3_chans;
sh_audio->wf->nSamplesPerSec = mp3_found->mp3_freq;
sh_audio->wf->nBlockAlign = 1152;
sh_audio->wf->nBlockAlign = mpa_spf;
sh_audio->wf->wBitsPerSample = 16;
sh_audio->wf->cbSize = 0;
free(mp3_found);
@ -397,7 +397,7 @@ int demux_audio_fill_buffer(demux_stream_t *ds) {
dp = new_demux_packet(l);
memcpy(dp->buffer,hdr,4);
stream_read(s,dp->buffer + 4,l-4);
priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + 1152/(float)sh_audio->samplerate; // FIXME: 1152->576 if MPEG-2
priv->last_pts = priv->last_pts < 0 ? 0 : priv->last_pts + sh_audio->audio.dwScale/(float)sh_audio->samplerate;
break;
}
} break;
@ -433,7 +433,7 @@ static void high_res_mp3_seek(demuxer_t *demuxer,float time) {
da_priv_t* priv = demuxer->priv;
sh_audio_t* sh = (sh_audio_t*)demuxer->audio->sh;
nf = time*sh->samplerate/1152;
nf = time*sh->samplerate/sh->audio.dwScale;
while(nf > 0) {
stream_read(demuxer->stream,hdr,4);
len = mp_decode_mp3_header(hdr);
@ -442,7 +442,7 @@ static void high_res_mp3_seek(demuxer_t *demuxer,float time) {
continue;
}
stream_skip(demuxer->stream,len-4);
priv->last_pts += 1152/(float)sh->samplerate;
priv->last_pts += sh->audio.dwScale/(float)sh->samplerate;
nf--;
}
}

17
libmpdemux/mp3_hdr.c
View File

@ -34,7 +34,7 @@ int mp_mp3_get_lsf(unsigned char* hbuf){
/*
* return frame size or -1 (bad frame)
*/
int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate){
int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate, int* spf, int* mpa_layer){
int stereo,ssize,lsf,framesize,padding,bitrate_index,sampling_frequency;
int layer, mult[3] = { 12000, 144000, 144000 };
unsigned long newhead =
@ -115,7 +115,20 @@ int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* srate){
framesize += padding;
// if(framesize<=0 || framesize>MAXFRAMESIZE) return FALSE;
if(srate) *srate = freqs[sampling_frequency];
if(srate) {
*srate = freqs[sampling_frequency];
if(spf) {
if(layer == 1)
*spf = 384;
else if(layer == 2)
*spf = 1152;
else if(*srate < 32000)
*spf = 576;
else
*spf = 1152;
}
}
if(mpa_layer) *mpa_layer = layer;
if(chans) *chans = stereo;
return framesize;

4
libmpdemux/mp3_hdr.h
View File

@ -1,7 +1,7 @@
int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* freq);
int mp_get_mp3_header(unsigned char* hbuf,int* chans, int* freq, int* spf, int* mpa_layer);
#define mp_decode_mp3_header(hbuf) mp_get_mp3_header(hbuf,NULL,NULL)
#define mp_decode_mp3_header(hbuf) mp_get_mp3_header(hbuf,NULL,NULL,NULL,NULL)
static inline int mp_check_mp3_header(unsigned int head){
if( (head & 0x0000e0ff) != 0x0000e0ff ||