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mpv/libmpdemux/demux_audio.c
Uoti Urpala fc6a9e4a3e build: switch to libavutil bswap.h and intreadwrite.h 
Remove the private bswap and intreadwrite.h implementations and use
libavutil headers instead.

Originally these headers weren't publicly installed by libavutil at
all. That already changed in 2010, but the pure C bswap version in
installed headers was very inefficient. That was recently (2011-12)
improved and now using the public bswap version probably shouldn't
cause noticeable performance problems, at least if using a new enough
compiler.
2012-02-01 22:46:27 +02:00

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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <libavutil/intreadwrite.h>
#include "config.h"
#include "options.h"
#include "mp_msg.h"
#include "stream/stream.h"
#include "aviprint.h"
#include "demuxer.h"
#include "stheader.h"
#include "genres.h"
#include "mp3_hdr.h"
#define MP3 1
#define WAV 2
#define fLaC 3
#define HDR_SIZE 4
typedef struct da_priv {
int frmt;
double next_pts;
} da_priv_t;
//! rather arbitrary value for maximum length of wav-format headers
#define MAX_WAVHDR_LEN (1 * 1024 * 1024)
//! how many valid frames in a row we need before accepting as valid MP3
#define MIN_MP3_HDRS 12
//! Used to describe a potential (chain of) MP3 headers we found
typedef struct mp3_hdr {
off_t frame_pos; // start of first frame in this "chain" of headers
off_t next_frame_pos; // here we expect the next header with same parameters
int mp3_chans;
int mp3_freq;
int mpa_spf;
int mpa_layer;
int mpa_br;
int cons_hdrs; // if this reaches MIN_MP3_HDRS we accept as MP3 file
struct mp3_hdr *next;
} mp3_hdr_t;
/**
* \brief free a list of MP3 header descriptions
* \param list pointer to the head-of-list pointer
*/
static void free_mp3_hdrs(mp3_hdr_t **list) {
mp3_hdr_t *tmp;
while (*list) {
tmp = (*list)->next;
free(*list);
*list = tmp;
}
}
/**
* \brief add another potential MP3 header to our list
* If it fits into an existing chain this one is expanded otherwise
* a new one is created.
* All entries that expected a MP3 header before the current position
* are discarded.
* The list is expected to be and will be kept sorted by next_frame_pos
* and when those are equal by frame_pos.
* \param list pointer to the head-of-list pointer
* \param st_pos stream position where the described header starts
* \param mp3_chans number of channels as specified by the header (*)
* \param mp3_freq sampling frequency as specified by the header (*)
* \param mpa_spf frame size as specified by the header
* \param mpa_layer layer type ("version") as specified by the header (*)
* \param mpa_br bitrate as specified by the header
* \param mp3_flen length of the frame as specified by the header
* \return If non-null the current file is accepted as MP3 and the
* mp3_hdr struct describing the valid chain is returned. Must be
* freed independent of the list.
*
* parameters marked by (*) must be the same for all headers in the same chain
*/
static mp3_hdr_t *add_mp3_hdr(mp3_hdr_t **list, off_t st_pos,
int mp3_chans, int mp3_freq, int mpa_spf,
int mpa_layer, int mpa_br, int mp3_flen) {
mp3_hdr_t *tmp;
int in_list = 0;
while (*list && (*list)->next_frame_pos <= st_pos) {
if (((*list)->next_frame_pos < st_pos) || ((*list)->mp3_chans != mp3_chans)
|| ((*list)->mp3_freq != mp3_freq) || ((*list)->mpa_layer != mpa_layer) ) {
// wasn't valid!
tmp = (*list)->next;
free(*list);
*list = tmp;
} else {
(*list)->cons_hdrs++;
(*list)->next_frame_pos = st_pos + mp3_flen;
(*list)->mpa_spf = mpa_spf;
(*list)->mpa_br = mpa_br;
if ((*list)->cons_hdrs >= MIN_MP3_HDRS) {
// copy the valid entry, so that the list can be easily freed
tmp = malloc(sizeof(mp3_hdr_t));
memcpy(tmp, *list, sizeof(mp3_hdr_t));
tmp->next = NULL;
return tmp;
}
in_list = 1;
list = &((*list)->next);
}
}
if (!in_list) { // does not belong into an existing chain, insert
// find right position to insert to keep sorting
while (*list && (*list)->next_frame_pos <= st_pos + mp3_flen)
list = &((*list)->next);
tmp = malloc(sizeof(mp3_hdr_t));
tmp->frame_pos = st_pos;
tmp->next_frame_pos = st_pos + mp3_flen;
tmp->mp3_chans = mp3_chans;
tmp->mp3_freq = mp3_freq;
tmp->mpa_spf = mpa_spf;
tmp->mpa_layer = mpa_layer;
tmp->mpa_br = mpa_br;
tmp->cons_hdrs = 1;
tmp->next = *list;
*list = tmp;
}
return NULL;
}
#if 0 /* this code is a mess, clean it up before reenabling */
#define FLAC_SIGNATURE_SIZE 4
#define FLAC_STREAMINFO_SIZE 34
#define FLAC_SEEKPOINT_SIZE 18
enum {
FLAC_STREAMINFO = 0,
FLAC_PADDING,
FLAC_APPLICATION,
FLAC_SEEKTABLE,
FLAC_VORBIS_COMMENT,
FLAC_CUESHEET
} flac_preamble_t;
static void
get_flac_metadata (demuxer_t* demuxer)
{
uint8_t preamble[4];
unsigned int blk_len;
stream_t *s = demuxer->stream;
/* file is qualified; skip over the signature bytes in the stream */
stream_seek (s, 4);
/* loop through the metadata blocks; use a do-while construct since there
* will always be 1 metadata block */
do {
int r;
r = stream_read (s, (char *) preamble, FLAC_SIGNATURE_SIZE);
if (r != FLAC_SIGNATURE_SIZE)
return;
blk_len = AV_RB24(preamble + 1);
switch (preamble[0] & 0x7F)
{
case FLAC_VORBIS_COMMENT:
{
/* For a description of the format please have a look at */
/* http://www.xiph.org/vorbis/doc/v-comment.html */
uint32_t length, comment_list_len;
char comments[blk_len];
uint8_t *ptr = comments;
char *comment;
int cn;
char c;
if (stream_read (s, comments, blk_len) == blk_len)
{
length = AV_RL32(ptr);
ptr += 4 + length;
comment_list_len = AV_RL32(ptr);
ptr += 4;
cn = 0;
for (; cn < comment_list_len; cn++)
{
length = AV_RL32(ptr);
ptr += 4;
comment = ptr;
if (&comment[length] < comments || &comment[length] >= &comments[blk_len])
return;
c = comment[length];
comment[length] = 0;
if (!strncasecmp ("TITLE=", comment, 6) && (length - 6 > 0))
demux_info_add (demuxer, "Title", comment + 6);
else if (!strncasecmp ("ARTIST=", comment, 7) && (length - 7 > 0))
demux_info_add (demuxer, "Artist", comment + 7);
else if (!strncasecmp ("ALBUM=", comment, 6) && (length - 6 > 0))
demux_info_add (demuxer, "Album", comment + 6);
else if (!strncasecmp ("DATE=", comment, 5) && (length - 5 > 0))
demux_info_add (demuxer, "Year", comment + 5);
else if (!strncasecmp ("GENRE=", comment, 6) && (length - 6 > 0))
demux_info_add (demuxer, "Genre", comment + 6);
else if (!strncasecmp ("Comment=", comment, 8) && (length - 8 > 0))
demux_info_add (demuxer, "Comment", comment + 8);
else if (!strncasecmp ("TRACKNUMBER=", comment, 12)
&& (length - 12 > 0))
{
char buf[31];
buf[30] = '\0';
sprintf (buf, "%d", atoi (comment + 12));
demux_info_add(demuxer, "Track", buf);
}
comment[length] = c;
ptr += length;
}
}
break;
}
case FLAC_STREAMINFO:
case FLAC_PADDING:
case FLAC_APPLICATION:
case FLAC_SEEKTABLE:
case FLAC_CUESHEET:
default:
/* 6-127 are presently reserved */
stream_skip (s, blk_len);
break;
}
} while ((preamble[0] & 0x80) == 0);
}
#endif
static 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;
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;
da_priv_t* priv;
s = demuxer->stream;
stream_read(s, hdr, HDR_SIZE);
while(n < 30000 && !s->eof) {
int mp3_freq, mp3_chans, mp3_flen, mpa_layer, mpa_spf, mpa_br;
st_pos = stream_tell(s) - HDR_SIZE;
step = 1;
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] == 'I' && hdr[1] == 'D' && hdr[2] == '3' && (hdr[3] >= 2)) {
int len;
stream_skip(s,2);
stream_read(s,hdr,4);
len = (hdr[0]<<21) | (hdr[1]<<14) | (hdr[2]<<7) | hdr[3];
stream_skip(s,len);
step = 4;
} 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,
&mpa_spf, &mpa_layer, &mpa_br)) > 0) {
mp3_found = add_mp3_hdr(&mp3_hdrs, st_pos, mp3_chans, mp3_freq,
mpa_spf, mpa_layer, mpa_br, mp3_flen);
if (mp3_found) {
frmt = MP3;
break;
}
} else if( hdr[0] == 'f' && hdr[1] == 'L' && hdr[2] == 'a' && hdr[3] == 'C' ) {
frmt = fLaC;
if (!mp3_hdrs || mp3_hdrs->cons_hdrs < 3)
break;
}
// Add here some other audio format detection
if(step < HDR_SIZE)
memmove(hdr,&hdr[step],HDR_SIZE-step);
stream_read(s, &hdr[HDR_SIZE - step], step);
n++;
}
free_mp3_hdrs(&mp3_hdrs);
if(!frmt)
return 0;
sh_audio = new_sh_audio(demuxer,0);
switch(frmt) {
case MP3:
sh_audio->format = (mp3_found->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 = mp3_found->mpa_spf;
sh_audio->audio.dwRate = mp3_found->mp3_freq;
sh_audio->wf = malloc(sizeof(*sh_audio->wf));
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->nAvgBytesPerSec = mp3_found->mpa_br * (1000 / 8);
sh_audio->wf->nBlockAlign = mp3_found->mpa_spf;
sh_audio->wf->wBitsPerSample = 16;
sh_audio->wf->cbSize = 0;
sh_audio->i_bps = sh_audio->wf->nAvgBytesPerSec;
free(mp3_found);
mp3_found = NULL;
if(s->end_pos && (s->flags & MP_STREAM_SEEK) == MP_STREAM_SEEK) {
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;
l = stream_read_dword_le(s);
if(l < 16) {
mp_msg(MSGT_DEMUX,MSGL_ERR,"[demux_audio] Bad wav header length: too short (%d)!!!\n",l);
l = 16;
}
if(l > MAX_WAVHDR_LEN) {
mp_msg(MSGT_DEMUX,MSGL_ERR,"[demux_audio] Bad wav header length: too long (%d)!!!\n",l);
l = 16;
}
sh_audio->wf = w = malloc(l > sizeof(*w) ? l : sizeof(*w));
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 = stream_read_word_le(s);
sh_audio->samplesize = (w->wBitsPerSample + 7) / 8;
w->cbSize = 0;
sh_audio->i_bps = sh_audio->wf->nAvgBytesPerSec;
l -= 16;
if (l >= 2) {
w->cbSize = stream_read_word_le(s);
l -= 2;
if (l < w->cbSize) {
mp_msg(MSGT_DEMUX,MSGL_ERR,"[demux_audio] truncated extradata (%d < %d)\n",
l,w->cbSize);
w->cbSize = l;
}
stream_read(s,(char*)(w + 1),w->cbSize);
l -= w->cbSize;
if (w->wFormatTag == 0xfffe && w->cbSize >= 22)
sh_audio->format = le2me_16(((WAVEFORMATEXTENSIBLE *)w)->SubFormat);
}
if( mp_msg_test(MSGT_DEMUX,MSGL_V) ) print_wave_header(w, MSGL_V);
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 (!s->eof && chunk_type != mmioFOURCC('d', 'a', 't', 'a'));
demuxer->movi_start = stream_tell(s);
demuxer->movi_end = chunk_size ? demuxer->movi_start + chunk_size : s->end_pos;
// printf("wav: %X .. %X\n",(int)demuxer->movi_start,(int)demuxer->movi_end);
// Check if it contains dts audio
if((w->wFormatTag == 0x01) && (w->nChannels == 2) && (w->nSamplesPerSec == 44100)) {
unsigned char buf[16384]; // vlc uses 16384*4 (4 dts frames)
unsigned int i;
memset(buf, 0, sizeof(buf));
stream_read(s, buf, sizeof(buf));
for (i = 0; i < sizeof(buf) - 5; i += 2) {
// DTS, 14 bit, LE
if((buf[i] == 0xff) && (buf[i+1] == 0x1f) && (buf[i+2] == 0x00) &&
(buf[i+3] == 0xe8) && ((buf[i+4] & 0xfe) == 0xf0) && (buf[i+5] == 0x07)) {
sh_audio->format = 0x2001;
mp_msg(MSGT_DEMUX,MSGL_V,"[demux_audio] DTS audio in wav, 14 bit, LE\n");
break;
}
// DTS, 14 bit, BE
if((buf[i] == 0x1f) && (buf[i+1] == 0xff) && (buf[i+2] == 0xe8) &&
(buf[i+3] == 0x00) && (buf[i+4] == 0x07) && ((buf[i+5] & 0xfe) == 0xf0)) {
sh_audio->format = 0x2001;
mp_msg(MSGT_DEMUX,MSGL_V,"[demux_audio] DTS audio in wav, 14 bit, BE\n");
break;
}
// DTS, 16 bit, BE
if((buf[i] == 0x7f) && (buf[i+1] == 0xfe) && (buf[i+2] == 0x80) &&
(buf[i+3] == 0x01)) {
sh_audio->format = 0x2001;
mp_msg(MSGT_DEMUX,MSGL_V,"[demux_audio] DTS audio in wav, 16 bit, BE\n");
break;
}
// DTS, 16 bit, LE
if((buf[i] == 0xfe) && (buf[i+1] == 0x7f) && (buf[i+2] == 0x01) &&
(buf[i+3] == 0x80)) {
sh_audio->format = 0x2001;
mp_msg(MSGT_DEMUX,MSGL_V,"[demux_audio] DTS audio in wav, 16 bit, LE\n");
break;
}
}
if (sh_audio->format == 0x2001) {
sh_audio->needs_parsing = 1;
mp_msg(MSGT_DEMUX,MSGL_DBG2,"[demux_audio] DTS sync offset = %u\n", i);
}
}
stream_seek(s,demuxer->movi_start);
} break;
case fLaC:
sh_audio->format = mmioFOURCC('f', 'L', 'a', 'C');
demuxer->movi_start = stream_tell(s) - 4;
demuxer->movi_end = s->end_pos;
if (demuxer->movi_end > demuxer->movi_start) {
// try to find out approx. bitrate
int64_t size = demuxer->movi_end - demuxer->movi_start;
int64_t num_samples;
int32_t srate;
stream_skip(s, 14);
srate = stream_read_int24(s) >> 4;
num_samples = stream_read_int24(s) << 16;
num_samples |= stream_read_word(s);
if (num_samples && srate)
sh_audio->i_bps = size * srate / num_samples;
}
if (sh_audio->i_bps < 1) // guess value to prevent crash
sh_audio->i_bps = 64 * 1024;
sh_audio->needs_parsing = 1;
// get_flac_metadata (demuxer);
break;
}
priv = malloc(sizeof(da_priv_t));
priv->frmt = frmt;
priv->next_pts = 0;
demuxer->priv = priv;
demuxer->audio->id = 0;
demuxer->audio->sh = sh_audio;
sh_audio->ds = demuxer->audio;
sh_audio->samplerate = sh_audio->audio.dwRate;
if(stream_tell(s) != demuxer->movi_start)
{
mp_msg(MSGT_DEMUX, MSGL_V, "demux_audio: seeking from 0x%X to start pos 0x%X\n",
(int)stream_tell(s), (int)demuxer->movi_start);
stream_seek(s,demuxer->movi_start);
if (stream_tell(s) != demuxer->movi_start) {
mp_msg(MSGT_DEMUX, MSGL_V, "demux_audio: seeking failed, now at 0x%X!\n",
(int)stream_tell(s));
if (next_frame_pos) {
mp_msg(MSGT_DEMUX, MSGL_V, "demux_audio: seeking to 0x%X instead\n",
(int)next_frame_pos);
stream_seek(s, next_frame_pos);
}
}
}
mp_msg(MSGT_DEMUX,MSGL_V,"demux_audio: audio data 0x%X - 0x%X \n",(int)demuxer->movi_start,(int)demuxer->movi_end);
return DEMUXER_TYPE_AUDIO;
}
static int demux_audio_fill_buffer(demuxer_t *demux, demux_stream_t *ds) {
int l;
demux_packet_t* dp;
sh_audio_t* sh_audio = ds->sh;
da_priv_t* priv = demux->priv;
double this_pts = priv->next_pts;
stream_t* s = demux->stream;
if(s->eof)
return 0;
switch(priv->frmt) {
case MP3 :
while(1) {
uint8_t hdr[4];
stream_read(s,hdr,4);
if (s->eof)
return 0;
l = mp_decode_mp3_header(hdr);
if(l < 0) {
if (demux->movi_end && stream_tell(s) >= demux->movi_end)
return 0; // might be ID3 tag, i.e. EOF
stream_skip(s,-3);
} else {
dp = new_demux_packet(l);
memcpy(dp->buffer,hdr,4);
if (stream_read(s,dp->buffer + 4,l-4) != l-4)
{
free_demux_packet(dp);
return 0;
}
priv->next_pts += sh_audio->audio.dwScale/(double)sh_audio->samplerate;
break;
}
} break;
case WAV : {
unsigned align = sh_audio->wf->nBlockAlign;
l = sh_audio->wf->nAvgBytesPerSec;
if (l <= 0) l = 65536;
if (demux->movi_end && l > demux->movi_end - stream_tell(s)) {
// do not read beyond end, there might be junk after data chunk
l = demux->movi_end - stream_tell(s);
if (l <= 0) return 0;
}
if (align)
l = (l + align - 1) / align * align;
dp = new_demux_packet(l);
l = stream_read(s,dp->buffer,l);
priv->next_pts += l/(double)sh_audio->i_bps;
break;
}
case fLaC: {
l = 65535;
dp = new_demux_packet(l);
l = stream_read(s,dp->buffer,l);
priv->next_pts = MP_NOPTS_VALUE;
break;
}
default:
mp_tmsg(MSGT_DEMUXER,MSGL_WARN,"Audio demuxer: unknown format %d.\n",priv->frmt);
return 0;
}
resize_demux_packet(dp, l);
dp->pts = this_pts;
ds_add_packet(ds, dp);
return 1;
}
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/sh->audio.dwScale;
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->next_pts += sh->audio.dwScale/(double)sh->samplerate;
nf--;
}
}
static void demux_audio_seek(demuxer_t *demuxer,float rel_seek_secs,float audio_delay,int flags){
struct MPOpts *opts = demuxer->opts;
sh_audio_t* sh_audio;
stream_t* s;
int64_t 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 && opts->hr_mp3_seek && !(flags & SEEK_FACTOR)) {
len = (flags & SEEK_ABSOLUTE) ? rel_seek_secs - priv->next_pts : rel_seek_secs;
if(len < 0) {
stream_seek(s,demuxer->movi_start);
len = priv->next_pts + len;
priv->next_pts = 0;
}
if(len > 0)
high_res_mp3_seek(demuxer,len);
return;
}
base = flags&SEEK_ABSOLUTE ? demuxer->movi_start : stream_tell(s);
if(flags&SEEK_FACTOR)
pos = base + ((demuxer->movi_end - demuxer->movi_start)*rel_seek_secs);
else
pos = base + (rel_seek_secs*sh_audio->i_bps);
if(demuxer->movi_end && pos >= demuxer->movi_end) {
pos = demuxer->movi_end;
} else if(pos < demuxer->movi_start)
pos = demuxer->movi_start;
priv->next_pts = (pos-demuxer->movi_start)/(double)sh_audio->i_bps;
switch(priv->frmt) {
case WAV:
pos -= (pos - demuxer->movi_start) %
(sh_audio->wf->nBlockAlign ? sh_audio->wf->nBlockAlign :
(sh_audio->channels * sh_audio->samplesize));
break;
}
stream_seek(s,pos);
}
static void demux_close_audio(demuxer_t* demuxer) {
da_priv_t* priv = demuxer->priv;
free(priv);
}
static int demux_audio_control(demuxer_t *demuxer,int cmd, void *arg){
sh_audio_t *sh_audio=demuxer->audio->sh;
int audio_length = sh_audio->i_bps ? demuxer->movi_end / sh_audio->i_bps : 0;
da_priv_t* priv = demuxer->priv;
switch(cmd) {
case DEMUXER_CTRL_GET_TIME_LENGTH:
if (audio_length<=0) return DEMUXER_CTRL_DONTKNOW;
*((double *)arg)=(double)audio_length;
return DEMUXER_CTRL_GUESS;
case DEMUXER_CTRL_GET_PERCENT_POS:
if (audio_length<=0)
return DEMUXER_CTRL_DONTKNOW;
*((int *)arg)=(int)( (priv->next_pts*100) / audio_length);
return DEMUXER_CTRL_OK;
default:
return DEMUXER_CTRL_NOTIMPL;
}
}
const demuxer_desc_t demuxer_desc_audio = {
"Audio demuxer",
"audio",
"Audio only",
"?",
"Audio only files",
DEMUXER_TYPE_AUDIO,
0, // unsafe autodetect
demux_audio_open,
demux_audio_fill_buffer,
NULL,
demux_close_audio,
demux_audio_seek,
demux_audio_control
};
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