static int wav_write_header(AVFormatContext *s) { WAVContext *wav = s->priv_data; AVIOContext *pb = s->pb; int64_t fmt, fact; ffio_wfourcc(pb, "RIFF"); avio_wl32(pb, 0); /* file length */ ffio_wfourcc(pb, "WAVE"); /* format header */ fmt = ff_start_tag(pb, "fmt "); if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) { av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n", s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE"); av_free(wav); return -1; } ff_end_tag(pb, fmt); if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */ && s->pb->seekable) { fact = ff_start_tag(pb, "fact"); avio_wl32(pb, 0); ff_end_tag(pb, fact); } av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate); wav->maxpts = wav->last_duration = 0; wav->minpts = INT64_MAX; /* data header */ wav->data = ff_start_tag(pb, "data"); avio_flush(pb); return 0; }