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add parsing of 1SNh header in the EA demuxer 

Originally committed as revision 10859 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2007-10-25 20:38:49 +00:00
parent 63bb42fb36
commit 98168220b0
1 changed files with 49 additions and 0 deletions
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49
libavformat/electronicarts.c
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@ -27,6 +27,10 @@
#include "avformat.h"
#define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
#define _SNh_TAG MKTAG('1', 'S', 'N', 'h') /* 1SNx header */
#define EACS_TAG MKTAG('E', 'A', 'C', 'S')
#define _SNd_TAG MKTAG('1', 'S', 'N', 'd') /* 1SNx data */
#define _SNe_TAG MKTAG('1', 'S', 'N', 'e') /* 1SNx end */
#define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)
#define GSTR_TAG MKTAG('G', 'S', 'T', 'R')
#define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
@ -170,6 +174,37 @@ static int process_audio_header_elements(AVFormatContext *s)
return 1;
}
/*
* Process EACS sound header
* return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
*/
static int process_audio_header_eacs(AVFormatContext *s)
{
EaDemuxContext *ea = s->priv_data;
ByteIOContext *pb = &s->pb;
int compression_type;
ea->sample_rate = ea->big_endian ? get_be32(pb) : get_le32(pb);
ea->bytes = get_byte(pb); /* 1=8-bit, 2=16-bit */
ea->num_channels = get_byte(pb);
compression_type = get_byte(pb);
url_fskip(pb, 13);
switch (compression_type) {
case 0:
switch (ea->bytes) {
case 1: ea->audio_codec = CODEC_ID_PCM_S8; break;
case 2: ea->audio_codec = CODEC_ID_PCM_S16LE; break;
}
break;
case 1: ea->audio_codec = CODEC_ID_PCM_MULAW; ea->bytes = 1; break;
default:
av_log (s, AV_LOG_ERROR, "unsupported stream type; audio compression_type=%i\n", compression_type);
}
return 1;
}
static int process_video_header_vp6(AVFormatContext *s)
{
EaDemuxContext *ea = s->priv_data;
@ -205,6 +240,14 @@ static int process_ea_header(AVFormatContext *s) {
size = bswap_32(size);
switch (blockid) {
case _SNh_TAG:
if (get_le32(pb) != EACS_TAG) {
av_log (s, AV_LOG_ERROR, "unknown 1SNh headerid\n");
return 0;
}
err = process_audio_header_eacs(s);
break;
case SCHl_TAG :
blockid = get_le32(pb);
if (blockid == GSTR_TAG) {
@ -304,6 +347,11 @@ static int ea_read_packet(AVFormatContext *s,
switch (chunk_type) {
/* audio data */
case _SNh_TAG:
/* header chunk also contains data; skip over the header portion*/
url_fskip(pb, 32);
chunk_size -= 32;
case _SNd_TAG:
case SCDl_TAG:
if (!ea->audio_codec) {
url_fskip(pb, chunk_size);
@ -336,6 +384,7 @@ static int ea_read_packet(AVFormatContext *s,
/* ending tag */
case 0:
case _SNe_TAG:
case SCEl_TAG:
ret = AVERROR(EIO);
packet_read = 1;