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ffmpeg/libavdevice/pulse_audio_dec.c

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/*
* Pulseaudio input
* Copyright (c) 2011 Luca Barbato <lu_zero@gentoo.org>
* Copyright 2004-2006 Lennart Poettering
* Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <pulse/rtclock.h>
#include <pulse/error.h>
#include "libavformat/avformat.h"
#include "libavformat/internal.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "pulse_audio_common.h"
#include "timefilter.h"
#define DEFAULT_CODEC_ID AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)
typedef struct PulseData {
AVClass *class;
char *server;
char *name;
char *stream_name;
int sample_rate;
int channels;
int frame_size;
int fragment_size;
pa_threaded_mainloop *mainloop;
pa_context *context;
pa_stream *stream;
TimeFilter *timefilter;
int last_period;
int wallclock;
} PulseData;
#define CHECK_SUCCESS_GOTO(rerror, expression, label) \
do { \
if (!(expression)) { \
rerror = AVERROR_EXTERNAL; \
goto label; \
} \
} while (0)
#define CHECK_DEAD_GOTO(p, rerror, label) \
do { \
if (!(p)->context || !PA_CONTEXT_IS_GOOD(pa_context_get_state((p)->context)) || \
!(p)->stream || !PA_STREAM_IS_GOOD(pa_stream_get_state((p)->stream))) { \
rerror = AVERROR_EXTERNAL; \
goto label; \
} \
} while (0)
static void context_state_cb(pa_context *c, void *userdata) {
PulseData *p = userdata;
switch (pa_context_get_state(c)) {
case PA_CONTEXT_READY:
case PA_CONTEXT_TERMINATED:
case PA_CONTEXT_FAILED:
pa_threaded_mainloop_signal(p->mainloop, 0);
break;
}
}
static void stream_state_cb(pa_stream *s, void * userdata) {
PulseData *p = userdata;
switch (pa_stream_get_state(s)) {
case PA_STREAM_READY:
case PA_STREAM_FAILED:
case PA_STREAM_TERMINATED:
pa_threaded_mainloop_signal(p->mainloop, 0);
break;
}
}
static void stream_request_cb(pa_stream *s, size_t length, void *userdata) {
PulseData *p = userdata;
pa_threaded_mainloop_signal(p->mainloop, 0);
}
static void stream_latency_update_cb(pa_stream *s, void *userdata) {
PulseData *p = userdata;
pa_threaded_mainloop_signal(p->mainloop, 0);
}
static av_cold int pulse_close(AVFormatContext *s)
{
PulseData *pd = s->priv_data;
if (pd->mainloop)
pa_threaded_mainloop_stop(pd->mainloop);
if (pd->stream)
pa_stream_unref(pd->stream);
pd->stream = NULL;
if (pd->context) {
pa_context_disconnect(pd->context);
pa_context_unref(pd->context);
}
pd->context = NULL;
if (pd->mainloop)
pa_threaded_mainloop_free(pd->mainloop);
pd->mainloop = NULL;
ff_timefilter_destroy(pd->timefilter);
pd->timefilter = NULL;
return 0;
}
static av_cold int pulse_read_header(AVFormatContext *s)
{
PulseData *pd = s->priv_data;
AVStream *st;
char *device = NULL;
int ret;
enum AVCodecID codec_id =
s->audio_codec_id == AV_CODEC_ID_NONE ? DEFAULT_CODEC_ID : s->audio_codec_id;
const pa_sample_spec ss = { ff_codec_id_to_pulse_format(codec_id),
pd->sample_rate,
pd->channels };
pa_buffer_attr attr = { -1 };
st = avformat_new_stream(s, NULL);
if (!st) {
av_log(s, AV_LOG_ERROR, "Cannot add stream\n");
return AVERROR(ENOMEM);
}
attr.fragsize = pd->fragment_size;
if (s->filename[0] != '\0' && strcmp(s->filename, "default"))
device = s->filename;
if (!(pd->mainloop = pa_threaded_mainloop_new())) {
pulse_close(s);
return AVERROR_EXTERNAL;
}
if (!(pd->context = pa_context_new(pa_threaded_mainloop_get_api(pd->mainloop), pd->name))) {
pulse_close(s);
return AVERROR_EXTERNAL;
}
pa_context_set_state_callback(pd->context, context_state_cb, pd);
if (pa_context_connect(pd->context, pd->server, 0, NULL) < 0) {
pulse_close(s);
return AVERROR(pa_context_errno(pd->context));
}
pa_threaded_mainloop_lock(pd->mainloop);
if (pa_threaded_mainloop_start(pd->mainloop) < 0) {
ret = -1;
goto unlock_and_fail;
}
for (;;) {
pa_context_state_t state;
state = pa_context_get_state(pd->context);
if (state == PA_CONTEXT_READY)
break;
if (!PA_CONTEXT_IS_GOOD(state)) {
ret = AVERROR(pa_context_errno(pd->context));
goto unlock_and_fail;
}
/* Wait until the context is ready */
pa_threaded_mainloop_wait(pd->mainloop);
}
if (!(pd->stream = pa_stream_new(pd->context, pd->stream_name, &ss, NULL))) {
ret = AVERROR(pa_context_errno(pd->context));
goto unlock_and_fail;
}
pa_stream_set_state_callback(pd->stream, stream_state_cb, pd);
pa_stream_set_read_callback(pd->stream, stream_request_cb, pd);
pa_stream_set_write_callback(pd->stream, stream_request_cb, pd);
pa_stream_set_latency_update_callback(pd->stream, stream_latency_update_cb, pd);
ret = pa_stream_connect_record(pd->stream, device, &attr,
PA_STREAM_INTERPOLATE_TIMING
|PA_STREAM_ADJUST_LATENCY
|PA_STREAM_AUTO_TIMING_UPDATE);
if (ret < 0) {
ret = AVERROR(pa_context_errno(pd->context));
goto unlock_and_fail;
}
for (;;) {
pa_stream_state_t state;
state = pa_stream_get_state(pd->stream);
if (state == PA_STREAM_READY)
break;
if (!PA_STREAM_IS_GOOD(state)) {
ret = AVERROR(pa_context_errno(pd->context));
goto unlock_and_fail;
}
/* Wait until the stream is ready */
pa_threaded_mainloop_wait(pd->mainloop);
}
pa_threaded_mainloop_unlock(pd->mainloop);
/* take real parameters */
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
st->codec->codec_id = codec_id;
st->codec->sample_rate = pd->sample_rate;
st->codec->channels = pd->channels;
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
pd->timefilter = ff_timefilter_new(1000000.0 / pd->sample_rate,
1000, 1.5E-6);
if (!pd->timefilter) {
pulse_close(s);
return AVERROR(ENOMEM);
}
return 0;
unlock_and_fail:
pa_threaded_mainloop_unlock(pd->mainloop);
pulse_close(s);
return ret;
}
static int pulse_read_packet(AVFormatContext *s, AVPacket *pkt)
{
PulseData *pd = s->priv_data;
int ret;
size_t read_length;
const void *read_data = NULL;
int64_t dts;
pa_usec_t latency;
int negative;
pa_threaded_mainloop_lock(pd->mainloop);
CHECK_DEAD_GOTO(pd, ret, unlock_and_fail);
while (!read_data) {
int r;
r = pa_stream_peek(pd->stream, &read_data, &read_length);
CHECK_SUCCESS_GOTO(ret, r == 0, unlock_and_fail);
if (read_length <= 0) {
pa_threaded_mainloop_wait(pd->mainloop);
CHECK_DEAD_GOTO(pd, ret, unlock_and_fail);
} else if (!read_data) {
/* There's a hole in the stream, skip it. We could generate
* silence, but that wouldn't work for compressed streams. */
r = pa_stream_drop(pd->stream);
CHECK_SUCCESS_GOTO(ret, r == 0, unlock_and_fail);
}
}
if (av_new_packet(pkt, read_length) < 0) {
ret = AVERROR(ENOMEM);
goto unlock_and_fail;
}
dts = av_gettime();
pa_operation_unref(pa_stream_update_timing_info(pd->stream, NULL, NULL));
if (pa_stream_get_latency(pd->stream, &latency, &negative) >= 0) {
enum AVCodecID codec_id =
s->audio_codec_id == AV_CODEC_ID_NONE ? DEFAULT_CODEC_ID : s->audio_codec_id;
int frame_size = ((av_get_bits_per_sample(codec_id) >> 3) * pd->channels);
int frame_duration = read_length / frame_size;
if (negative) {
dts += latency;
} else
dts -= latency;
if (pd->wallclock)
pkt->pts = ff_timefilter_update(pd->timefilter, dts, pd->last_period);
pd->last_period = frame_duration;
} else {
av_log(s, AV_LOG_WARNING, "pa_stream_get_latency() failed\n");
}
memcpy(pkt->data, read_data, read_length);
pa_stream_drop(pd->stream);
pa_threaded_mainloop_unlock(pd->mainloop);
return 0;
unlock_and_fail:
pa_threaded_mainloop_unlock(pd->mainloop);
return ret;
}
static int pulse_get_device_list(AVFormatContext *h, AVDeviceInfoList *device_list)
{
PulseData *s = h->priv_data;
return ff_pulse_audio_get_devices(device_list, s->server, 0);
}
#define OFFSET(a) offsetof(PulseData, a)
#define D AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
{ "server", "set PulseAudio server", OFFSET(server), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, D },
{ "name", "set application name", OFFSET(name), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, D },
{ "stream_name", "set stream description", OFFSET(stream_name), AV_OPT_TYPE_STRING, {.str = "record"}, 0, 0, D },
{ "sample_rate", "set sample rate in Hz", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, D },
{ "channels", "set number of audio channels", OFFSET(channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, D },
{ "frame_size", "set number of bytes per frame", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, D },
{ "fragment_size", "set buffering size, affects latency and cpu usage", OFFSET(fragment_size), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D },
{ "wallclock", "set the initial pts using the current time", OFFSET(wallclock), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, D },
{ NULL },
};
static const AVClass pulse_demuxer_class = {
.class_name = "Pulse demuxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
};
AVInputFormat ff_pulse_demuxer = {
.name = "pulse",
.long_name = NULL_IF_CONFIG_SMALL("Pulse audio input"),
.priv_data_size = sizeof(PulseData),
.read_header = pulse_read_header,
.read_packet = pulse_read_packet,
.read_close = pulse_close,
.get_device_list = pulse_get_device_list,
.flags = AVFMT_NOFILE,
.priv_class = &pulse_demuxer_class,
};
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