#define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
#define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)
+#define GSTR_TAG MKTAG('G', 'S', 'T', 'R')
#define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
#define SCEl_TAG MKTAG('S', 'C', 'E', 'l')
-
-#define EA_SAMPLE_RATE 22050
-#define EA_BITS_PER_SAMPLE 16
-#define EA_PREAMBLE_SIZE 8
+#define MVhd_TAG MKTAG('M', 'V', 'h', 'd')
+#define MV0K_TAG MKTAG('M', 'V', '0', 'K')
+#define MV0F_TAG MKTAG('M', 'V', '0', 'F')
typedef struct EaDemuxContext {
- int width;
- int height;
+ int big_endian;
+
+ int video_codec;
+ AVRational time_base;
int video_stream_index;
- int track_count;
+ int audio_codec;
int audio_stream_index;
int audio_frame_counter;
int64_t audio_pts;
- int64_t video_pts;
- int video_pts_inc;
- float fps;
+ int bytes;
+ int sample_rate;
int num_channels;
int num_samples;
- int compression_type;
} EaDemuxContext;
static uint32_t read_arbitary(ByteIOContext *pb) {
}
/*
- * Process WVE file header
- * Returns 1 if the WVE file is valid and successfully opened, 0 otherwise
+ * Process PT/GSTR sound header
+ * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
*/
-static int process_ea_header(AVFormatContext *s) {
- int inHeader;
- uint32_t blockid, size;
+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;
- if (get_le32(pb) != SCHl_TAG)
- return 0;
- size = get_le32(pb);
- if (get_le32(pb) != PT00_TAG) {
- av_log (s, AV_LOG_ERROR, "PT header missing\n");
- return 0;
- }
+ ea->bytes = 2;
+ ea->sample_rate = -1;
+ ea->num_channels = 1;
- inHeader = 1;
while (inHeader) {
int inSubheader;
uint8_t byte;
- byte = get_byte(pb) & 0xFF;
+ byte = get_byte(pb);
switch (byte) {
case 0xFD:
inSubheader = 1;
while (inSubheader) {
uint8_t subbyte;
- subbyte = get_byte(pb) & 0xFF;
+ subbyte = get_byte(pb);
switch (subbyte) {
+ case 0x80:
+ revision = read_arbitary(pb);
+ av_log (s, AV_LOG_INFO, "revision (element 0x80) set to 0x%08x\n", revision);
+ break;
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);
+ compression_type = read_arbitary(pb);
+ av_log (s, AV_LOG_INFO, "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_INFO, "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_INFO, "exited audio subheader\n");
inSubheader = 0;
break;
+ case 0xFF:
+ av_log (s, AV_LOG_INFO, "end of header block reached (within audio subheader)\n");
+ inSubheader = 0;
+ inHeader = 0;
+ break;
default:
av_log (s, AV_LOG_INFO, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
break;
}
}
- if ((ea->num_channels != 2) || (ea->compression_type != 7)) {
- av_log (s, AV_LOG_ERROR, "unsupported stream type\n");
+ switch (compression_type) {
+ case 0: ea->audio_codec = CODEC_ID_PCM_S16LE; break;
+ case 7: ea->audio_codec = CODEC_ID_ADPCM_EA; break;
+ default:
+ av_log(s, AV_LOG_ERROR, "unsupported stream type; compression_type=%i\n", compression_type);
return 0;
}
- /* skip to the start of the data */
- url_fseek(pb, size, SEEK_SET);
+ if (ea->sample_rate == -1)
+ ea->sample_rate = revision==3 ? 48000 : 22050;
+
+ return 1;
+}
+
+static int process_video_header_vp6(AVFormatContext *s)
+{
+ EaDemuxContext *ea = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+
+ url_fskip(pb, 16);
+ ea->time_base.den = get_le32(pb);
+ ea->time_base.num = get_le32(pb);
+ ea->video_codec = CODEC_ID_VP6;
+
+ return 1;
+}
+
+/*
+ * Process EA file header
+ * Returns 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;
+ ByteIOContext *pb = &s->pb;
+ int i;
+
+ for (i=0; i<5 && (!ea->audio_codec || !ea->video_codec); i++) {
+ unsigned int startpos = url_ftell(pb);
+ int err = 0;
+
+ blockid = get_le32(pb);
+ size = get_le32(pb);
+ if (i == 0)
+ ea->big_endian = size > 0x000FFFFF;
+ if (ea->big_endian)
+ size = bswap_32(size);
+
+ switch (blockid) {
+ case SCHl_TAG :
+ blockid = get_le32(pb);
+ if (blockid == GSTR_TAG) {
+ url_fskip(pb, 4);
+ } else if (blockid != PT00_TAG) {
+ av_log (s, AV_LOG_ERROR, "unknown SCHl headerid\n");
+ return 0;
+ }
+ err = process_audio_header_elements(s);
+ 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;
+ }
+
+ url_fseek(pb, startpos + size, SEEK_SET);
+ }
+
+ url_fseek(pb, 0, SEEK_SET);
return 1;
}
static int ea_probe(AVProbeData *p)
{
- if (AV_RL32(&p->buf[0]) != SCHl_TAG)
- return 0;
+ uint32_t tag;
+
+ tag = AV_RL32(&p->buf[0]);
+ if (tag == SCHl_TAG || tag == MVhd_TAG)
+ return AVPROBE_SCORE_MAX;
- return AVPROBE_SCORE_MAX;
+ return 0;
}
static int ea_read_header(AVFormatContext *s,
if (!process_ea_header(s))
return AVERROR(EIO);
-#if 0
- /* initialize the video decoder stream */
- st = av_new_stream(s, 0);
- if (!st)
- return AVERROR(ENOMEM);
- av_set_pts_info(st, 33, 1, 90000);
- ea->video_stream_index = st->index;
- st->codec->codec_type = CODEC_TYPE_VIDEO;
- st->codec->codec_id = CODEC_ID_EA_MJPEG;
- st->codec->codec_tag = 0; /* no fourcc */
-#endif
+ if (ea->time_base.num && ea->time_base.den) {
+ /* initialize the video decoder stream */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return AVERROR(ENOMEM);
+ ea->video_stream_index = st->index;
+ st->codec->codec_type = CODEC_TYPE_VIDEO;
+ st->codec->codec_id = ea->video_codec;
+ st->codec->codec_tag = 0; /* no fourcc */
+ st->codec->time_base = ea->time_base;
+ }
/* initialize the audio decoder stream */
st = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
- av_set_pts_info(st, 33, 1, EA_SAMPLE_RATE);
+ av_set_pts_info(st, 33, 1, ea->sample_rate);
st->codec->codec_type = CODEC_TYPE_AUDIO;
- st->codec->codec_id = CODEC_ID_ADPCM_EA;
+ st->codec->codec_id = ea->audio_codec;
st->codec->codec_tag = 0; /* no tag */
st->codec->channels = ea->num_channels;
- st->codec->sample_rate = EA_SAMPLE_RATE;
- st->codec->bits_per_sample = EA_BITS_PER_SAMPLE;
+ st->codec->sample_rate = ea->sample_rate;
+ st->codec->bits_per_sample = ea->bytes * 8;
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
st->codec->bits_per_sample / 4;
st->codec->block_align = st->codec->channels * st->codec->bits_per_sample;
ByteIOContext *pb = &s->pb;
int ret = 0;
int packet_read = 0;
- unsigned char preamble[EA_PREAMBLE_SIZE];
unsigned int chunk_type, chunk_size;
+ int key = 0;
while (!packet_read) {
-
- if (get_buffer(pb, preamble, EA_PREAMBLE_SIZE) != EA_PREAMBLE_SIZE)
- return AVERROR(EIO);
- chunk_type = AV_RL32(&preamble[0]);
- chunk_size = AV_RL32(&preamble[4]) - EA_PREAMBLE_SIZE;
+ chunk_type = get_le32(pb);
+ chunk_size = (ea->big_endian ? get_be32(pb) : get_le32(pb)) - 8;
switch (chunk_type) {
/* audio data */
pkt->stream_index = ea->audio_stream_index;
pkt->pts = 90000;
pkt->pts *= ea->audio_frame_counter;
- pkt->pts /= EA_SAMPLE_RATE;
+ pkt->pts /= ea->sample_rate;
/* 2 samples/byte, 1 or 2 samples per frame depending
* on stereo; chunk also has 12-byte header */
packet_read = 1;
break;
+ case MV0K_TAG:
+ key = PKT_FLAG_KEY;
+ case MV0F_TAG:
+ ret = av_get_packet(pb, pkt, chunk_size);
+ if (ret != chunk_size)
+ ret = AVERROR_IO;
+ else {
+ pkt->stream_index = ea->video_stream_index;
+ pkt->flags |= key;
+ }
+ packet_read = 1;
+ break;
+
default:
url_fseek(pb, chunk_size, SEEK_CUR);
break;
}
-
- /* ending packet */
- if (chunk_type == SCEl_TAG) {
- }
}
return ret;
projects / ffmpeg / blobdiff