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unified wav header parsing - added extradata support

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Originally committed as revision 1092 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2002-10-28 00:55:25 +00:00
parent 6d2abd6b3e
commit e095026ab4
4 changed files with 41 additions and 57 deletions
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19
libav/asf.c
View File

@ -745,7 +745,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
ByteIOContext *pb = &s->pb;
AVStream *st;
ASFStream *asf_st;
int size, i, bps;
int size, i;
INT64 gsize;
av_set_pts_info(s, 32, 1, 1000); /* 32 bit pts in ms */
@ -784,7 +784,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
asf->packet_size = asf->hdr.max_pktsize;
asf->nb_packets = asf->hdr.packets_count;
} else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
int type, id, total_size;
int type, total_size;
unsigned int tag1;
INT64 pos1, pos2;
@ -819,20 +819,7 @@ static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
st->codec.codec_type = type;
st->codec.frame_rate = 1000000; // us
if (type == CODEC_TYPE_AUDIO) {
id = get_le16(pb);
st->codec.codec_tag = id;
st->codec.channels = get_le16(pb);
st->codec.sample_rate = get_le32(pb);
st->codec.bit_rate = get_le32(pb) * 8;
st->codec.block_align = get_le16(pb); /* block align */
bps = get_le16(pb); /* bits per sample */
st->codec.codec_id = wav_codec_get_id(id, bps);
size = get_le16(pb);
if (size > 0) {
st->extra_data = av_mallocz(size);
get_buffer(pb, st->extra_data, size);
st->extra_data_size = size;
}
get_wav_header(pb, &st->codec, 1);
/* We have to init the frame size at some point .... */
pos2 = url_ftell(pb);
if (gsize > (pos2 + 8 - pos1 + 24)) {

2
libav/avi.h
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@ -17,6 +17,8 @@ typedef struct CodecTag {
void put_bmp_header(ByteIOContext *pb, AVCodecContext *enc, CodecTag *tags);
int put_wav_header(ByteIOContext *pb, AVCodecContext *enc);
int wav_codec_get_id(unsigned int tag, int bps);
void get_wav_header(ByteIOContext *pb, AVCodecContext *codec,
int has_extra_data);
extern CodecTag codec_bmp_tags[];
extern CodecTag codec_wav_tags[];

16
libav/avidec.c
View File

@ -51,7 +51,7 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
ByteIOContext *pb = &s->pb;
UINT32 tag, tag1;
int codec_type, stream_index, size, frame_period, bit_rate;
int i, bps;
int i;
AVStream *st;
/* check RIFF header */
@ -160,19 +160,7 @@ int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
url_fskip(pb, size - 5 * 4);
break;
case CODEC_TYPE_AUDIO:
tag1 = get_le16(pb);
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_tag = tag1;
#ifdef DEBUG
printf("audio: 0x%x\n", tag1);
#endif
st->codec.channels = get_le16(pb);
st->codec.sample_rate = get_le32(pb);
st->codec.bit_rate = get_le32(pb) * 8;
get_le16(pb); /* block align */
bps = get_le16(pb);
st->codec.codec_id = wav_codec_get_id(tag1, bps);
url_fskip(pb, size - 4 * 4);
get_wav_header(pb, &st->codec, (size >= 18));
break;
default:
url_fskip(pb, size);

61
libav/wav.c
View File

@ -1,6 +1,6 @@
/*
* WAV encoder and decoder
* Copyright (c) 2001 Fabrice Bellard.
* Copyright (c) 2001, 2002 Fabrice Bellard.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -29,6 +29,8 @@ CodecTag codec_wav_tags[] = {
{ CODEC_ID_PCM_MULAW, 0x07 },
{ CODEC_ID_ADPCM_MS, 0x02 },
{ CODEC_ID_ADPCM_IMA_WAV, 0x11 },
{ CODEC_ID_WMAV1, 0x160 },
{ CODEC_ID_WMAV2, 0x161 },
{ 0, 0 },
};
@ -101,6 +103,32 @@ int put_wav_header(ByteIOContext *pb, AVCodecContext *enc)
return hdrsize;
}
void get_wav_header(ByteIOContext *pb, AVCodecContext *codec,
int has_extra_data)
{
int id, bps, size;
id = get_le16(pb);
codec->codec_type = CODEC_TYPE_AUDIO;
codec->codec_tag = id;
codec->fourcc = id;
codec->channels = get_le16(pb);
codec->sample_rate = get_le32(pb);
codec->bit_rate = get_le32(pb) * 8;
codec->block_align = get_le16(pb);
bps = get_le16(pb); /* bits per sample */
codec->codec_id = wav_codec_get_id(id, bps);
if (has_extra_data) {
size = get_le16(pb);
if (size > 0) {
codec->extradata = av_mallocz(size);
get_buffer(pb, codec->extradata, size);
codec->extradata_size = size;
}
}
}
int wav_codec_get_id(unsigned int tag, int bps)
{
int id;
@ -213,8 +241,6 @@ static int wav_read_header(AVFormatContext *s,
int size;
unsigned int tag;
ByteIOContext *pb = &s->pb;
unsigned int id, channels, rate, bit_rate, extra_size, bps;
unsigned int blkalign;
AVStream *st;
/* check RIFF header */
@ -231,34 +257,15 @@ static int wav_read_header(AVFormatContext *s,
size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
if (size < 0)
return -1;
id = get_le16(pb);
channels = get_le16(pb);
rate = get_le32(pb);
bit_rate = get_le32(pb) * 8;
blkalign = get_le16(pb); /* block align */
bps = get_le16(pb); /* bits per sample */
if (size >= 18) {
/* wav_extra_size */
extra_size = get_le16(pb);
/* skip unused data */
url_fseek(pb, size - 18, SEEK_CUR);
}
size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
if (size < 0)
return -1;
/* now we are ready: build format streams */
st = av_new_stream(s, 0);
if (!st)
return AVERROR_NOMEM;
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_tag = id;
st->codec.codec_id = wav_codec_get_id(id, bps);
st->codec.channels = channels;
st->codec.sample_rate = rate;
st->codec.block_align = blkalign;
get_wav_header(pb, &st->codec, (size >= 18));
size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
if (size < 0)
return -1;
return 0;
}