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; }