mirror of
https://github.com/mpv-player/mpv
synced 2024-12-17 12:25:03 +00:00
226ac28fff
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15821 b3059339-0415-0410-9bf9-f77b7e298cf2
254 lines
5.5 KiB
C
254 lines
5.5 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "config.h"
|
|
#include "mp_msg.h"
|
|
#include "help_mp.h"
|
|
|
|
#include "stream.h"
|
|
#include "demuxer.h"
|
|
#include "parse_es.h"
|
|
#include "stheader.h"
|
|
|
|
#include "bswap.h"
|
|
#include "ms_hdr.h"
|
|
|
|
extern void resync_audio_stream(sh_audio_t *sh_audio);
|
|
|
|
typedef struct {
|
|
uint8_t *buf;
|
|
uint64_t size; /// amount of time of data packets pushed to demuxer->audio (in bytes)
|
|
float time; /// amount of time elapsed based upon samples_per_frame/sample_rate (in milliseconds)
|
|
float last_pts; /// last pts seen
|
|
int bitrate; /// bitrate computed as size/time
|
|
} aac_priv_t;
|
|
|
|
/// \param srate (out) sample rate
|
|
/// \param num (out) number of audio frames in this ADTS frame
|
|
/// \return size of the ADTS frame in bytes
|
|
/// aac_parse_frames needs a buffer at least 8 bytes long
|
|
int aac_parse_frame(uint8_t *buf, int *srate, int *num)
|
|
{
|
|
int i = 0, sr, fl = 0, id;
|
|
static int srates[] = {96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 0, 0, 0};
|
|
|
|
if((buf[i] != 0xFF) || ((buf[i+1] & 0xF6) != 0xF0))
|
|
return 0;
|
|
|
|
id = (buf[i+1] >> 3) & 0x01; //id=1 mpeg2, 0: mpeg4
|
|
sr = (buf[i+2] >> 2) & 0x0F;
|
|
if(sr > 11)
|
|
return 0;
|
|
*srate = srates[sr];
|
|
|
|
fl = ((buf[i+3] & 0x03) << 11) | (buf[i+4] << 3) | ((buf[i+5] >> 5) & 0x07);
|
|
*num = (buf[i+6] & 0x02) + 1;
|
|
|
|
return fl;
|
|
}
|
|
|
|
static int demux_aac_init(demuxer_t *demuxer)
|
|
{
|
|
aac_priv_t *priv;
|
|
|
|
priv = calloc(1, sizeof(aac_priv_t));
|
|
if(!priv)
|
|
return 0;
|
|
|
|
priv->buf = (uint8_t*) malloc(8);
|
|
if(!priv->buf)
|
|
return 0;
|
|
|
|
demuxer->priv = priv;
|
|
return 1;
|
|
}
|
|
|
|
void demux_close_aac(demuxer_t *demuxer)
|
|
{
|
|
aac_priv_t *priv = (aac_priv_t *) demuxer->priv;
|
|
|
|
if(!priv)
|
|
return;
|
|
|
|
if(priv->buf)
|
|
free(priv->buf);
|
|
|
|
free(demuxer->priv);
|
|
|
|
return;
|
|
}
|
|
|
|
/// returns 1 if it finds 8 ADTS frames in 32768 bytes, 0 otherwise
|
|
int demux_aac_probe(demuxer_t *demuxer)
|
|
{
|
|
int cnt = 0, c, len, srate, num;
|
|
off_t init, probed;
|
|
aac_priv_t *priv;
|
|
|
|
if(! demux_aac_init(demuxer))
|
|
{
|
|
mp_msg(MSGT_DEMUX, MSGL_ERR, "COULDN'T INIT aac_demux, exit\n");
|
|
return 0;
|
|
}
|
|
|
|
priv = (aac_priv_t *) demuxer->priv;
|
|
|
|
init = probed = stream_tell(demuxer->stream);
|
|
while(probed-init <= 32768 && cnt < 8)
|
|
{
|
|
c = 0;
|
|
while(c != 0xFF)
|
|
{
|
|
c = stream_read_char(demuxer->stream);
|
|
if(c < 0)
|
|
goto fail;
|
|
}
|
|
priv->buf[0] = 0xFF;
|
|
if(stream_read(demuxer->stream, &(priv->buf[1]), 7) < 7)
|
|
goto fail;
|
|
|
|
len = aac_parse_frame(priv->buf, &srate, &num);
|
|
if(len > 0)
|
|
{
|
|
cnt++;
|
|
stream_skip(demuxer->stream, len - 8);
|
|
}
|
|
probed = stream_tell(demuxer->stream);
|
|
}
|
|
|
|
stream_seek(demuxer->stream, init);
|
|
if(cnt < 8)
|
|
goto fail;
|
|
|
|
mp_msg(MSGT_DEMUX, MSGL_V, "demux_aac_probe, INIT: %llu, PROBED: %llu, cnt: %d\n", init, probed, cnt);
|
|
return 1;
|
|
|
|
fail:
|
|
mp_msg(MSGT_DEMUX, MSGL_V, "demux_aac_probe, failed to detect an AAC stream\n");
|
|
return 0;
|
|
}
|
|
|
|
int demux_aac_open(demuxer_t *demuxer)
|
|
{
|
|
sh_audio_t *sh;
|
|
|
|
sh = new_sh_audio(demuxer, 0);
|
|
sh->ds = demuxer->audio;
|
|
sh->format = mmioFOURCC('M', 'P', '4', 'A');
|
|
demuxer->audio->sh = sh;
|
|
|
|
demuxer->filepos = stream_tell(demuxer->stream);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int demux_aac_fill_buffer(demuxer_t *demuxer)
|
|
{
|
|
aac_priv_t *priv = (aac_priv_t *) demuxer->priv;
|
|
demux_packet_t *dp;
|
|
int c1, c2, len, srate, num;
|
|
float tm = 0;
|
|
|
|
if(demuxer->stream->eof || (demuxer->movi_end && stream_tell(demuxer->stream) >= demuxer->movi_end))
|
|
return 0;
|
|
|
|
while(! demuxer->stream->eof)
|
|
{
|
|
c1 = c2 = 0;
|
|
while(c1 != 0xFF)
|
|
{
|
|
c1 = stream_read_char(demuxer->stream);
|
|
if(c1 < 0)
|
|
return 0;
|
|
}
|
|
c2 = stream_read_char(demuxer->stream);
|
|
if(c2 < 0)
|
|
return 0;
|
|
if((c2 & 0xF6) != 0xF0)
|
|
continue;
|
|
|
|
priv->buf[0] = (unsigned char) c1;
|
|
priv->buf[1] = (unsigned char) c2;
|
|
if(stream_read(demuxer->stream, &(priv->buf[2]), 6) < 6)
|
|
return 0;
|
|
|
|
len = aac_parse_frame(priv->buf, &srate, &num);
|
|
if(len > 0)
|
|
{
|
|
dp = new_demux_packet(len);
|
|
if(! dp)
|
|
{
|
|
mp_msg(MSGT_DEMUX, MSGL_ERR, "fill_buffer, NEW_ADD_PACKET(%d)FAILED\n", len);
|
|
return 0;
|
|
}
|
|
|
|
|
|
memcpy(dp->buffer, priv->buf, 8);
|
|
stream_read(demuxer->stream, &(dp->buffer[8]), len-8);
|
|
if(srate)
|
|
tm = (float) (num * 1024.0/srate);
|
|
priv->last_pts += tm;
|
|
dp->pts = priv->last_pts;
|
|
//fprintf(stderr, "\nPTS: %.3f\n", dp->pts);
|
|
ds_add_packet(demuxer->audio, dp);
|
|
priv->size += len;
|
|
priv->time += tm;
|
|
|
|
priv->bitrate = (int) (priv->size / priv->time);
|
|
demuxer->filepos = stream_tell(demuxer->stream);
|
|
|
|
return len;
|
|
}
|
|
else
|
|
stream_skip(demuxer->stream, -6);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
//This is an almost verbatim copy of high_res_mp3_seek(), from demux_audio.c
|
|
void demux_aac_seek(demuxer_t *demuxer, float rel_seek_secs, int flags)
|
|
{
|
|
aac_priv_t *priv = (aac_priv_t *) demuxer->priv;
|
|
demux_stream_t *d_audio=demuxer->audio;
|
|
sh_audio_t *sh_audio=d_audio->sh;
|
|
float time;
|
|
|
|
ds_free_packs(d_audio);
|
|
|
|
time = (flags & 1) ? rel_seek_secs - priv->last_pts : rel_seek_secs;
|
|
if(time < 0)
|
|
{
|
|
stream_seek(demuxer->stream, demuxer->movi_start);
|
|
time = priv->last_pts + time;
|
|
priv->last_pts = 0;
|
|
}
|
|
|
|
if(time > 0)
|
|
{
|
|
int len, nf, srate, num;
|
|
|
|
nf = time * sh_audio->samplerate/1024;
|
|
|
|
while(nf > 0)
|
|
{
|
|
if(stream_read(demuxer->stream,priv->buf, 8) < 8)
|
|
break;
|
|
len = aac_parse_frame(priv->buf, &srate, &num);
|
|
if(len <= 0)
|
|
{
|
|
stream_skip(demuxer->stream, -7);
|
|
continue;
|
|
}
|
|
stream_skip(demuxer->stream, len - 8);
|
|
priv->last_pts += (float) (num*1024.0/srate);
|
|
nf -= num;
|
|
}
|
|
}
|
|
sh_audio->delay = priv->last_pts - (ds_tell_pts(demuxer->audio)-sh_audio->a_in_buffer_len)/(float)priv->bitrate;
|
|
resync_audio_stream(sh_audio);
|
|
}
|
|
|