/*
* Process PT/GSTR sound header
* return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
*/
static int process_audio_header_elements(AVFormatContext *s)
{
int inHeader = 1;
EaDemuxContext *ea = s->priv_data;
ByteIOContext *pb = s->pb;
int compression_type = -1, revision = -1, revision2 = -1;
ea->bytes = 2;
ea->sample_rate = -1;
ea->num_channels = 1;
while (inHeader) {
int inSubheader;
uint8_t byte;
byte = get_byte(pb);
switch (byte) {
case 0xFD:
av_log (s, AV_LOG_DEBUG, "entered audio subheader\n");
inSubheader = 1;
while (inSubheader) {
uint8_t subbyte;
subbyte = get_byte(pb);
switch (subbyte) {
case 0x80:
revision = read_arbitary(pb);
av_log (s, AV_LOG_DEBUG, "revision (element 0x80) set to 0x%08x\n", revision);
break;
case 0x82:
ea->num_channels = read_arbitary(pb);
av_log (s, AV_LOG_DEBUG, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);
break;
case 0x83:
compression_type = read_arbitary(pb);
av_log (s, AV_LOG_DEBUG, "compression_type (element 0x83) set to 0x%08x\n", compression_type);
break;
case 0x84:
ea->sample_rate = read_arbitary(pb);
av_log (s, AV_LOG_DEBUG, "sample_rate (element 0x84) set to %i\n", ea->sample_rate);
break;
case 0x85:
ea->num_samples = read_arbitary(pb);
av_log (s, AV_LOG_DEBUG, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);
break;
case 0x8A:
av_log (s, AV_LOG_DEBUG, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
av_log (s, AV_LOG_DEBUG, "exited audio subheader\n");
inSubheader = 0;
break;
case 0xA0:
revision2 = read_arbitary(pb);
av_log (s, AV_LOG_DEBUG, "revision2 (element 0xA0) set to 0x%08x\n", revision2);
break;
case 0xFF:
av_log (s, AV_LOG_DEBUG, "end of header block reached (within audio subheader)\n");
inSubheader = 0;
inHeader = 0;
break;
default:
av_log (s, AV_LOG_DEBUG, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
break;
}
}
break;
case 0xFF:
av_log (s, AV_LOG_DEBUG, "end of header block reached\n");
inHeader = 0;
break;
default:
av_log (s, AV_LOG_DEBUG, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));
break;
}
}
switch (compression_type) {
case 0: ea->audio_codec = CODEC_ID_PCM_S16LE; break;
case 7: ea->audio_codec = CODEC_ID_ADPCM_EA; break;
case -1:
switch (revision) {
case 1: ea->audio_codec = CODEC_ID_ADPCM_EA_R1; break;
case 2: ea->audio_codec = CODEC_ID_ADPCM_EA_R2; break;
case 3: ea->audio_codec = CODEC_ID_ADPCM_EA_R3; break;
case -1: break;
default:
av_log(s, AV_LOG_ERROR, "unsupported stream type; revision=%i\n", revision);
return 0;
}
switch (revision2) {
case 8: ea->audio_codec = CODEC_ID_PCM_S16LE_PLANAR; break;
case 10: ea->audio_codec = CODEC_ID_ADPCM_EA_R2; break;
case 16: ea->audio_codec = CODEC_ID_MP3; break;
case -1: break;
default:
ea->audio_codec = CODEC_ID_NONE;
av_log(s, AV_LOG_ERROR, "unsupported stream type; revision2=%i\n", revision2);
return 0;
}
break;
default:
av_log(s, AV_LOG_ERROR, "unsupported stream type; compression_type=%i\n", compression_type);
return 0;
}
if (ea->sample_rate == -1)
ea->sample_rate = revision==3 ? 48000 : 22050;
return 1;
}
/*
* Process WVE file header
* Returns 1 if the WVE file is valid and successfully opened, 0 otherwise
*/
static int process_ea_header(AVFormatContext *s) {
int inHeader;
uint32_t blockid, size;
EaDemuxContext *ea = s->priv_data;
ByteIOContext *pb = &s->pb;
if (get_buffer(pb, (void*)&blockid, 4) != 4) {
return 0;
}
if (le2me_32(blockid) != SCHl_TAG) {
return 0;
}
if (get_buffer(pb, (void*)&size, 4) != 4) {
return 0;
}
size = le2me_32(size);
if (get_buffer(pb, (void*)&blockid, 4) != 4) {
return 0;
}
if (le2me_32(blockid) != PT00_TAG) {
av_log (s, AV_LOG_ERROR, "PT header missing\n");
return 0;
}
inHeader = 1;
while (inHeader) {
int inSubheader;
uint8_t byte;
byte = get_byte(pb) & 0xFF;
switch (byte) {
case 0xFD:
av_log (s, AV_LOG_INFO, "entered audio subheader\n");
inSubheader = 1;
while (inSubheader) {
uint8_t subbyte;
subbyte = get_byte(pb) & 0xFF;
switch (subbyte) {
case 0x82:
ea->num_channels = read_arbitary(pb);
av_log (s, AV_LOG_INFO, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);
break;
case 0x83:
ea->compression_type = read_arbitary(pb);
av_log (s, AV_LOG_INFO, "compression_type (element 0x83) set to 0x%08x\n", ea->compression_type);
break;
case 0x85:
ea->num_samples = read_arbitary(pb);
av_log (s, AV_LOG_INFO, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);
break;
case 0x8A:
av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
av_log (s, AV_LOG_INFO, "exited audio subheader\n");
inSubheader = 0;
break;
default:
av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
break;
}
}
break;
case 0xFF:
av_log (s, AV_LOG_INFO, "end of header block reached\n");
inHeader = 0;
break;
default:
av_log (s, AV_LOG_INFO, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));
break;
}
}
if ((ea->num_channels != 2) || (ea->compression_type != 7)) {
av_log (s, AV_LOG_ERROR, "unsupported stream type\n");
return 0;
}
/* skip to the start of the data */
url_fseek(pb, size, SEEK_SET);
return 1;
}
