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better bitrate calculation

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16415 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2005-09-06 20:35:14 +00:00
parent a6c5758715
commit cb1bcc8b79
1 changed files with 10 additions and 1 deletions
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11
libmpdemux/demux_mpc.c
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@ -62,6 +62,8 @@ static int demux_mpc_check(demuxer_t* demuxer) {
if (hdr[0] != 'M' || hdr[1] != 'P' || hdr[2] != '+')
return 0;
demuxer->movi_start = stream_tell(s) - HDR_SIZE;
demuxer->movi_end = s->end_pos;
demuxer->priv = malloc(HDR_SIZE);
memcpy(demuxer->priv, hdr, HDR_SIZE);
return DEMUXER_TYPE_MPC;
@ -78,16 +80,23 @@ static demuxer_t *demux_mpc_open(demuxer_t* demuxer) {
char *wf = (char *)calloc(1, sizeof(WAVEFORMATEX) + HDR_SIZE);
char *header = &wf[sizeof(WAVEFORMATEX)];
const int freqs[4] = {44100, 48000, 37800, 32000};
int frames;
int seconds;
sh_audio->format = mmioFOURCC('M', 'P', 'C', ' ');
memcpy(header, priv, HDR_SIZE);
free(priv);
frames = header[4] | header[5] << 8 | header[6] << 16 | header[7] << 24;
sh_audio->wf = (WAVEFORMATEX *)wf;
sh_audio->wf->wFormatTag = sh_audio->format;
sh_audio->wf->nChannels = 2;
sh_audio->wf->nSamplesPerSec = freqs[header[10] & 3];
sh_audio->wf->nBlockAlign = 32 * 36;
sh_audio->wf->wBitsPerSample = 16;
sh_audio->wf->nAvgBytesPerSec = 128 * 1024; // dummy to make mencoder not hang
seconds = 1152 * frames / sh_audio->wf->nSamplesPerSec;
if (demuxer->movi_end > demuxer->movi_start && seconds > 0)
sh_audio->wf->nAvgBytesPerSec = (demuxer->movi_end - demuxer->movi_start) / seconds;
else
sh_audio->wf->nAvgBytesPerSec = 32 * 1024; // dummy to make mencoder not hang
sh_audio->wf->cbSize = HDR_SIZE;
demuxer->movi_start = stream_tell(s);
demuxer->movi_end = s->end_pos;