ffmpeg and libav are using the simple api. Please take a look at: https://github.com/FFmpeg/FFmpeg/blob/master/libavdevice/pulse.c https://github.com/libav/libav/blob/master/libavdevice/pulse.c Unfortunately the audio sample rate is not synchronized to the wallclock. For live streaming pulseaudio with another device like x11grab this is quite essential. Is there a way to get exact timestamps from pulse api? How would the implementation look like? peili static int pulse_read_packet(AVFormatContext *s, AVPacket *pkt) { PulseData *pd = s->priv_data; int res; pa_usec_t latency; *pkt->pts = GET EXACT TIMESTAMP (); // TODO* if (av_new_packet(pkt, pd->frame_size) < 0) { return AVERROR(ENOMEM); } if ((pa_simple_read(pd->s, pkt->data, pkt->size, &res)) < 0) { av_log(s, AV_LOG_ERROR, "pa_simple_read failed: %s\n", pa_strerror(res)); av_free_packet(pkt); return AVERROR(EIO); } if ((latency = pa_simple_get_latency(pd->s, &res)) == (pa_usec_t) -1) { av_log(s, AV_LOG_ERROR, "pa_simple_get_latency() failed: %s\n", pa_strerror(res)); return AVERROR(EIO); } return 0; } -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20130926/f93d9aff/attachment.html>
