static int mmf_write_header(AVFormatContext *s)
{
MMFContext *mmf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t pos;
int rate;
rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
if (rate < 0) {
av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n",
s->streams[0]->codec->sample_rate);
return -1;
}
ffio_wfourcc(pb, "MMMD");
avio_wb32(pb, 0);
pos = ff_start_tag(pb, "CNTI");
avio_w8(pb, 0); /* class */
avio_w8(pb, 0); /* type */
avio_w8(pb, 0); /* code type */
avio_w8(pb, 0); /* status */
avio_w8(pb, 0); /* counts */
end_tag_be(pb, pos);
pos = ff_start_tag(pb, "OPDA");
avio_write(pb, "VN:libavcodec,", sizeof("VN:libavcodec,") -1); /* metadata ("ST:songtitle,VN:version,...") */
end_tag_be(pb, pos);
avio_write(pb, "ATR\x00", 4);
avio_wb32(pb, 0);
mmf->atrpos = avio_tell(pb);
avio_w8(pb, 0); /* format type */
avio_w8(pb, 0); /* sequence type */
avio_w8(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
avio_w8(pb, 0); /* wave base bit */
avio_w8(pb, 2); /* time base d */
avio_w8(pb, 2); /* time base g */
ffio_wfourcc(pb, "Atsq");
avio_wb32(pb, 16);
mmf->atsqpos = avio_tell(pb);
/* Will be filled on close */
avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
mmf->awapos = ff_start_tag(pb, "Awa\x01");
avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
avio_flush(pb);
return 0;
}
static int mmf_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
MMFContext *mmf = s->priv_data;
int64_t pos, size;
int gatetime;
if (s->pb->seekable)
{
/* Fill in length fields */
end_tag_be(pb, mmf->awapos);
end_tag_be(pb, mmf->atrpos);
end_tag_be(pb, 8);
pos = avio_tell(pb);
size = pos - mmf->awapos;
/* Fill Atsq chunk */
avio_seek(pb, mmf->atsqpos, SEEK_SET);
/* "play wav" */
avio_w8(pb, 0); /* start time */
avio_w8(pb, 1); /* (channel << 6) | wavenum */
gatetime = size * 500 / s->streams[0]->codec->sample_rate;
put_varlength(pb, gatetime); /* duration */
/* "nop" */
put_varlength(pb, gatetime); /* start time */
avio_write(pb, "\xff\x00", 2); /* nop */
/* "end of sequence" */
avio_write(pb, "\x00\x00\x00\x00", 4);
avio_seek(pb, pos, SEEK_SET);
avio_flush(pb);
}
return 0;
}
static int mmf_write_trailer(AVFormatContext *s)
{
ByteIOContext *pb = s->pb;
MMFContext *mmf = s->priv_data;
offset_t pos, size;
int gatetime;
if (!url_is_streamed(s->pb)) {
/* Fill in length fields */
end_tag_be(pb, mmf->awapos);
end_tag_be(pb, mmf->atrpos);
end_tag_be(pb, 8);
pos = url_ftell(pb);
size = pos - mmf->awapos;
/* Fill Atsq chunk */
url_fseek(pb, mmf->atsqpos, SEEK_SET);
/* "play wav" */
put_byte(pb, 0); /* start time */
put_byte(pb, 1); /* (channel << 6) | wavenum */
gatetime = size * 500 / s->streams[0]->codec->sample_rate;
put_varlength(pb, gatetime); /* duration */
/* "nop" */
put_varlength(pb, gatetime); /* start time */
put_buffer(pb, "\xff\x00", 2); /* nop */
/* "end of sequence" */
put_buffer(pb, "\x00\x00\x00\x00", 4);
url_fseek(pb, pos, SEEK_SET);
put_flush_packet(pb);
}
return 0;
}
