/* Process EA file header.
* Return 1 if the EA file is valid and successfully opened, 0 otherwise. */
static int process_ea_header(AVFormatContext *s)
{
uint32_t blockid, size = 0;
EaDemuxContext *ea = s->priv_data;
AVIOContext *pb = s->pb;
int i;
for (i = 0; i < 5 && (!ea->audio_codec || !ea->video.codec); i++) {
uint64_t startpos = avio_tell(pb);
int err = 0;
blockid = avio_rl32(pb);
size = avio_rl32(pb);
if (i == 0)
ea->big_endian = size > av_bswap32(size);
if (ea->big_endian)
size = av_bswap32(size);
if (size < 8) {
av_log(s, AV_LOG_ERROR, "chunk size too small\n");
return AVERROR_INVALIDDATA;
}
switch (blockid) {
case ISNh_TAG:
if (avio_rl32(pb) != EACS_TAG) {
avpriv_request_sample(s, "unknown 1SNh headerid");
return 0;
}
process_audio_header_eacs(s);
break;
case SCHl_TAG:
case SHEN_TAG:
blockid = avio_rl32(pb);
if (blockid == GSTR_TAG) {
avio_skip(pb, 4);
} else if ((blockid & 0xFF) != (PT00_TAG & 0xFF)) {
blockid = avio_rl32(pb);
}
ea->platform = (blockid >> 16) & 0xFF;
err = process_audio_header_elements(s);
break;
case SEAD_TAG:
process_audio_header_sead(s);
break;
case MVIh_TAG:
process_video_header_cmv(s, &ea->video);
break;
case kVGT_TAG:
ea->video.codec = AV_CODEC_ID_TGV;
break;
case mTCD_TAG:
process_video_header_mdec(s, &ea->video);
break;
case MPCh_TAG:
ea->video.codec = AV_CODEC_ID_MPEG2VIDEO;
break;
case pQGT_TAG:
case TGQs_TAG:
ea->video.codec = AV_CODEC_ID_TGQ;
ea->video.time_base = (AVRational) { 1, 15 };
break;
case pIQT_TAG:
ea->video.codec = AV_CODEC_ID_TQI;
ea->video.time_base = (AVRational) { 1, 15 };
break;
case MADk_TAG:
ea->video.codec = AV_CODEC_ID_MAD;
avio_skip(pb, 6);
ea->video.time_base = (AVRational) { avio_rl16(pb), 1000 };
break;
case MVhd_TAG:
err = process_video_header_vp6(s, &ea->video);
break;
case AVhd_TAG:
err = process_video_header_vp6(s, &ea->alpha);
break;
}
if (err < 0) {
av_log(s, AV_LOG_ERROR, "error parsing header: %i\n", err);
return err;
}
avio_seek(pb, startpos + size, SEEK_SET);
}
avio_seek(pb, 0, SEEK_SET);
return 1;
}
/* Process EA file header.
* Return 1 if the EA file is valid and successfully opened, 0 otherwise. */
static int process_ea_header(AVFormatContext *s)
{
uint32_t blockid, size = 0;
EaDemuxContext *ea = s->priv_data;
AVIOContext *pb = s->pb;
int i;
for (i = 0; i < 5 && (!ea->audio_codec || !ea->video_codec); i++) {
unsigned int startpos = avio_tell(pb);
int err = 0;
blockid = avio_rl32(pb);
size = avio_rl32(pb);
if (i == 0)
ea->big_endian = size > 0x000FFFFF;
if (ea->big_endian)
size = av_bswap32(size);
switch (blockid) {
case ISNh_TAG:
if (avio_rl32(pb) != EACS_TAG) {
avpriv_request_sample(s, "unknown 1SNh headerid");
return 0;
}
process_audio_header_eacs(s);
break;
case SCHl_TAG:
case SHEN_TAG:
blockid = avio_rl32(pb);
if (blockid == GSTR_TAG) {
avio_skip(pb, 4);
} else if ((blockid & 0xFFFF) != PT00_TAG) {
avpriv_request_sample(s, "unknown SCHl headerid");
return 0;
}
err = process_audio_header_elements(s);
break;
case SEAD_TAG:
process_audio_header_sead(s);
break;
case MVIh_TAG:
process_video_header_cmv(s);
break;
case kVGT_TAG:
ea->video_codec = AV_CODEC_ID_TGV;
break;
case mTCD_TAG:
process_video_header_mdec(s);
break;
case MPCh_TAG:
ea->video_codec = AV_CODEC_ID_MPEG2VIDEO;
break;
case pQGT_TAG:
case TGQs_TAG:
ea->video_codec = AV_CODEC_ID_TGQ;
break;
case pIQT_TAG:
ea->video_codec = AV_CODEC_ID_TQI;
break;
case MADk_TAG:
ea->video_codec = AV_CODEC_ID_MAD;
break;
case MVhd_TAG:
err = process_video_header_vp6(s);
break;
}
if (err < 0) {
av_log(s, AV_LOG_ERROR, "error parsing header: %i\n", err);
return err;
}
avio_seek(pb, startpos + size, SEEK_SET);
}
avio_seek(pb, 0, SEEK_SET);
return 1;
}
