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librempeg/libavdevice/pulse_audio_enc.c
Michael Niedermayer 7dfa5d2d7f avdevice/pulse_audio_enc: Use av_rescale() to avoid integer overflow 
Fixes: CID1503075 Unintentional integer overflow

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2024-06-01 18:25:44 +02:00

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/*
* Copyright (c) 2013 Lukasz Marek <lukasz.m.luki@gmail.com>
*
* 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 <math.h>
#include <pulse/pulseaudio.h>
#include <pulse/error.h>
#include "libavformat/avformat.h"
#include "libavformat/internal.h"
#include "libavformat/mux.h"
#include "libavformat/version.h"
#include "libavutil/channel_layout.h"
#include "libavutil/frame.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavutil/log.h"
#include "libavutil/attributes.h"
#include "pulse_audio_common.h"
typedef struct PulseData {
AVClass *class;
const char *server;
const char *name;
const char *stream_name;
const char *device;
int64_t timestamp;
int buffer_size; /**< Buffer size in bytes */
int buffer_duration; /**< Buffer size in ms, recalculated to buffer_size */
int prebuf;
int minreq;
int last_result;
pa_threaded_mainloop *mainloop;
pa_context *ctx;
pa_stream *stream;
int nonblocking;
int mute;
pa_volume_t base_volume;
pa_volume_t last_volume;
} PulseData;
static void pulse_audio_sink_device_cb(pa_context *ctx, const pa_sink_info *dev,
int eol, void *userdata)
{
PulseData *s = userdata;
if (s->ctx != ctx)
return;
if (eol) {
pa_threaded_mainloop_signal(s->mainloop, 0);
} else {
if (dev->flags & PA_SINK_FLAT_VOLUME)
s->base_volume = dev->base_volume;
else
s->base_volume = PA_VOLUME_NORM;
av_log(s, AV_LOG_DEBUG, "base volume: %u\n", s->base_volume);
}
}
/* Mainloop must be locked before calling this function as it uses pa_threaded_mainloop_wait. */
static int pulse_update_sink_info(AVFormatContext *h)
{
PulseData *s = h->priv_data;
pa_operation *op;
if (!(op = pa_context_get_sink_info_by_name(s->ctx, s->device,
pulse_audio_sink_device_cb, s))) {
av_log(s, AV_LOG_ERROR, "pa_context_get_sink_info_by_name failed.\n");
return AVERROR_EXTERNAL;
}
while (pa_operation_get_state(op) == PA_OPERATION_RUNNING)
pa_threaded_mainloop_wait(s->mainloop);
pa_operation_unref(op);
return 0;
}
static void pulse_audio_sink_input_cb(pa_context *ctx, const pa_sink_input_info *i,
int eol, void *userdata)
{
AVFormatContext *h = userdata;
PulseData *s = h->priv_data;
if (s->ctx != ctx)
return;
if (!eol) {
double val;
pa_volume_t vol = pa_cvolume_avg(&i->volume);
if (s->mute < 0 || (s->mute && !i->mute) || (!s->mute && i->mute)) {
s->mute = i->mute;
avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_MUTE_STATE_CHANGED, &s->mute, sizeof(s->mute));
}
vol = pa_sw_volume_divide(vol, s->base_volume);
if (s->last_volume != vol) {
val = (double)vol / PA_VOLUME_NORM;
avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_VOLUME_LEVEL_CHANGED, &val, sizeof(val));
s->last_volume = vol;
}
}
}
/* This function creates new loop so may be called from PA callbacks.
Mainloop must be locked before calling this function as it operates on streams. */
static int pulse_update_sink_input_info(AVFormatContext *h)
{
PulseData *s = h->priv_data;
pa_operation *op;
enum pa_operation_state op_state;
pa_mainloop *ml = NULL;
pa_context *ctx = NULL;
int ret = 0;
if ((ret = ff_pulse_audio_connect_context(&ml, &ctx, s->server, "Update sink input information")) < 0)
return ret;
if (!(op = pa_context_get_sink_input_info(ctx, pa_stream_get_index(s->stream),
pulse_audio_sink_input_cb, h))) {
ret = AVERROR_EXTERNAL;
goto fail;
}
while ((op_state = pa_operation_get_state(op)) == PA_OPERATION_RUNNING)
pa_mainloop_iterate(ml, 1, NULL);
pa_operation_unref(op);
if (op_state != PA_OPERATION_DONE) {
ret = AVERROR_EXTERNAL;
goto fail;
}
fail:
ff_pulse_audio_disconnect_context(&ml, &ctx);
if (ret)
av_log(s, AV_LOG_ERROR, "pa_context_get_sink_input_info failed.\n");
return ret;
}
static void pulse_event(pa_context *ctx, pa_subscription_event_type_t t,
uint32_t idx, void *userdata)
{
AVFormatContext *h = userdata;
PulseData *s = h->priv_data;
if (s->ctx != ctx)
return;
if ((t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) == PA_SUBSCRIPTION_EVENT_SINK_INPUT) {
if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_CHANGE)
// Calling from mainloop callback. No need to lock mainloop.
pulse_update_sink_input_info(h);
}
}
static void pulse_stream_writable(pa_stream *stream, size_t nbytes, void *userdata)
{
AVFormatContext *h = userdata;
PulseData *s = h->priv_data;
int64_t val = nbytes;
if (stream != s->stream)
return;
avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_BUFFER_WRITABLE, &val, sizeof(val));
pa_threaded_mainloop_signal(s->mainloop, 0);
}
static void pulse_overflow(pa_stream *stream, void *userdata)
{
AVFormatContext *h = userdata;
avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_BUFFER_OVERFLOW, NULL, 0);
}
static void pulse_underflow(pa_stream *stream, void *userdata)
{
AVFormatContext *h = userdata;
avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_BUFFER_UNDERFLOW, NULL, 0);
}
static void pulse_stream_state(pa_stream *stream, void *userdata)
{
PulseData *s = userdata;
if (stream != s->stream)
return;
switch (pa_stream_get_state(s->stream)) {
case PA_STREAM_READY:
case PA_STREAM_FAILED:
case PA_STREAM_TERMINATED:
pa_threaded_mainloop_signal(s->mainloop, 0);
default:
break;
}
}
static int pulse_stream_wait(PulseData *s)
{
pa_stream_state_t state;
while ((state = pa_stream_get_state(s->stream)) != PA_STREAM_READY) {
if (state == PA_STREAM_FAILED || state == PA_STREAM_TERMINATED)
return AVERROR_EXTERNAL;
pa_threaded_mainloop_wait(s->mainloop);
}
return 0;
}
static void pulse_context_state(pa_context *ctx, void *userdata)
{
PulseData *s = userdata;
if (s->ctx != ctx)
return;
switch (pa_context_get_state(ctx)) {
case PA_CONTEXT_READY:
case PA_CONTEXT_FAILED:
case PA_CONTEXT_TERMINATED:
pa_threaded_mainloop_signal(s->mainloop, 0);
default:
break;
}
}
static int pulse_context_wait(PulseData *s)
{
pa_context_state_t state;
while ((state = pa_context_get_state(s->ctx)) != PA_CONTEXT_READY) {
if (state == PA_CONTEXT_FAILED || state == PA_CONTEXT_TERMINATED)
return AVERROR_EXTERNAL;
pa_threaded_mainloop_wait(s->mainloop);
}
return 0;
}
static void pulse_stream_result(pa_stream *stream, int success, void *userdata)
{
PulseData *s = userdata;
if (stream != s->stream)
return;
s->last_result = success ? 0 : AVERROR_EXTERNAL;
pa_threaded_mainloop_signal(s->mainloop, 0);
}
static int pulse_finish_stream_operation(PulseData *s, pa_operation *op, const char *name)
{
if (!op) {
pa_threaded_mainloop_unlock(s->mainloop);
av_log(s, AV_LOG_ERROR, "%s failed.\n", name);
return AVERROR_EXTERNAL;
}
s->last_result = 2;
while (s->last_result == 2)
pa_threaded_mainloop_wait(s->mainloop);
pa_operation_unref(op);
pa_threaded_mainloop_unlock(s->mainloop);
if (s->last_result != 0)
av_log(s, AV_LOG_ERROR, "%s failed.\n", name);
return s->last_result;
}
static int pulse_set_pause(PulseData *s, int pause)
{
pa_operation *op;
pa_threaded_mainloop_lock(s->mainloop);
op = pa_stream_cork(s->stream, pause, pulse_stream_result, s);
return pulse_finish_stream_operation(s, op, "pa_stream_cork");
}
static int pulse_flash_stream(PulseData *s)
{
pa_operation *op;
pa_threaded_mainloop_lock(s->mainloop);
op = pa_stream_flush(s->stream, pulse_stream_result, s);
return pulse_finish_stream_operation(s, op, "pa_stream_flush");
}
static void pulse_context_result(pa_context *ctx, int success, void *userdata)
{
PulseData *s = userdata;
if (s->ctx != ctx)
return;
s->last_result = success ? 0 : AVERROR_EXTERNAL;
pa_threaded_mainloop_signal(s->mainloop, 0);
}
static int pulse_finish_context_operation(PulseData *s, pa_operation *op, const char *name)
{
if (!op) {
pa_threaded_mainloop_unlock(s->mainloop);
av_log(s, AV_LOG_ERROR, "%s failed.\n", name);
return AVERROR_EXTERNAL;
}
s->last_result = 2;
while (s->last_result == 2)
pa_threaded_mainloop_wait(s->mainloop);
pa_operation_unref(op);
pa_threaded_mainloop_unlock(s->mainloop);
if (s->last_result != 0)
av_log(s, AV_LOG_ERROR, "%s failed.\n", name);
return s->last_result;
}
static int pulse_set_mute(PulseData *s)
{
pa_operation *op;
pa_threaded_mainloop_lock(s->mainloop);
op = pa_context_set_sink_input_mute(s->ctx, pa_stream_get_index(s->stream),
s->mute, pulse_context_result, s);
return pulse_finish_context_operation(s, op, "pa_context_set_sink_input_mute");
}
static int pulse_set_volume(PulseData *s, double volume)
{
pa_operation *op;
pa_cvolume cvol;
pa_volume_t vol;
const pa_sample_spec *ss = pa_stream_get_sample_spec(s->stream);
vol = pa_sw_volume_multiply(lrint(volume * PA_VOLUME_NORM), s->base_volume);
pa_cvolume_set(&cvol, ss->channels, PA_VOLUME_NORM);
pa_sw_cvolume_multiply_scalar(&cvol, &cvol, vol);
pa_threaded_mainloop_lock(s->mainloop);
op = pa_context_set_sink_input_volume(s->ctx, pa_stream_get_index(s->stream),
&cvol, pulse_context_result, s);
return pulse_finish_context_operation(s, op, "pa_context_set_sink_input_volume");
}
static int pulse_subscribe_events(PulseData *s)
{
pa_operation *op;
pa_threaded_mainloop_lock(s->mainloop);
op = pa_context_subscribe(s->ctx, PA_SUBSCRIPTION_MASK_SINK_INPUT, pulse_context_result, s);
return pulse_finish_context_operation(s, op, "pa_context_subscribe");
}
static void pulse_map_channels_to_pulse(const AVChannelLayout *channel_layout, pa_channel_map *channel_map)
{
channel_map->channels = 0;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_FRONT_LEFT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_LEFT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_FRONT_RIGHT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_FRONT_CENTER) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_CENTER;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_LOW_FREQUENCY) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_LFE;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_BACK_LEFT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_REAR_LEFT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_BACK_RIGHT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_REAR_RIGHT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_FRONT_LEFT_OF_CENTER) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_FRONT_RIGHT_OF_CENTER) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_BACK_CENTER) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_REAR_CENTER;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_SIDE_LEFT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_SIDE_LEFT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_SIDE_RIGHT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_SIDE_RIGHT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_TOP_CENTER) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_CENTER;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_TOP_FRONT_LEFT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_FRONT_LEFT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_TOP_FRONT_CENTER) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_FRONT_CENTER;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_TOP_FRONT_RIGHT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_FRONT_RIGHT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_TOP_BACK_LEFT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_REAR_LEFT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_TOP_BACK_CENTER) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_REAR_CENTER;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_TOP_BACK_RIGHT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_TOP_REAR_RIGHT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_STEREO_LEFT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_LEFT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_STEREO_RIGHT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_WIDE_LEFT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_AUX0;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_WIDE_RIGHT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_AUX1;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_SURROUND_DIRECT_LEFT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_AUX2;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_SURROUND_DIRECT_RIGHT) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_AUX3;
if (av_channel_layout_index_from_channel(channel_layout, AV_CHAN_LOW_FREQUENCY_2) >= 0)
channel_map->map[channel_map->channels++] = PA_CHANNEL_POSITION_LFE;
}
static av_cold int pulse_write_trailer(AVFormatContext *h)
{
PulseData *s = h->priv_data;
if (s->mainloop) {
pa_threaded_mainloop_lock(s->mainloop);
if (s->stream) {
pa_stream_disconnect(s->stream);
pa_stream_set_state_callback(s->stream, NULL, NULL);
pa_stream_set_write_callback(s->stream, NULL, NULL);
pa_stream_set_overflow_callback(s->stream, NULL, NULL);
pa_stream_set_underflow_callback(s->stream, NULL, NULL);
pa_stream_unref(s->stream);
s->stream = NULL;
}
if (s->ctx) {
pa_context_disconnect(s->ctx);
pa_context_set_state_callback(s->ctx, NULL, NULL);
pa_context_set_subscribe_callback(s->ctx, NULL, NULL);
pa_context_unref(s->ctx);
s->ctx = NULL;
}
pa_threaded_mainloop_unlock(s->mainloop);
pa_threaded_mainloop_stop(s->mainloop);
pa_threaded_mainloop_free(s->mainloop);
s->mainloop = NULL;
}
return 0;
}
static av_cold int pulse_write_header(AVFormatContext *h)
{
PulseData *s = h->priv_data;
AVStream *st = NULL;
int ret;
pa_sample_spec sample_spec;
pa_buffer_attr buffer_attributes = { -1, -1, -1, -1, -1 };
pa_channel_map channel_map;
pa_mainloop_api *mainloop_api;
const char *stream_name = s->stream_name;
static const pa_stream_flags_t stream_flags = PA_STREAM_INTERPOLATE_TIMING |
PA_STREAM_AUTO_TIMING_UPDATE |
PA_STREAM_NOT_MONOTONIC;
if (h->nb_streams != 1 || h->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO) {
av_log(s, AV_LOG_ERROR, "Only a single audio stream is supported.\n");
return AVERROR(EINVAL);
}
st = h->streams[0];
if (!stream_name) {
if (h->url[0])
stream_name = h->url;
else
stream_name = "Playback";
}
s->nonblocking = (h->flags & AVFMT_FLAG_NONBLOCK);
if (s->buffer_duration) {
int64_t bytes = av_rescale(s->buffer_duration,
st->codecpar->ch_layout.nb_channels *
(int64_t)st->codecpar->sample_rate *
av_get_bytes_per_sample(st->codecpar->format),
1000);
buffer_attributes.tlength = FFMAX(s->buffer_size, av_clip64(bytes, 0, UINT32_MAX - 1));
av_log(s, AV_LOG_DEBUG,
"Buffer duration: %ums recalculated into %"PRId64" bytes buffer.\n",
s->buffer_duration, bytes);
av_log(s, AV_LOG_DEBUG, "Real buffer length is %u bytes\n", buffer_attributes.tlength);
} else if (s->buffer_size)
buffer_attributes.tlength = s->buffer_size;
if (s->prebuf)
buffer_attributes.prebuf = s->prebuf;
if (s->minreq)
buffer_attributes.minreq = s->minreq;
sample_spec.format = ff_codec_id_to_pulse_format(st->codecpar->codec_id);
sample_spec.rate = st->codecpar->sample_rate;
sample_spec.channels = st->codecpar->ch_layout.nb_channels;
if (!pa_sample_spec_valid(&sample_spec)) {
av_log(s, AV_LOG_ERROR, "Invalid sample spec.\n");
return AVERROR(EINVAL);
}
if (sample_spec.channels == 1) {
channel_map.channels = 1;
channel_map.map[0] = PA_CHANNEL_POSITION_MONO;
} else if (st->codecpar->ch_layout.order != AV_CHANNEL_ORDER_UNSPEC) {
if (!av_channel_layout_check(&st->codecpar->ch_layout))
return AVERROR(EINVAL);
pulse_map_channels_to_pulse(&st->codecpar->ch_layout, &channel_map);
/* Unknown channel is present in channel_layout, let PulseAudio use its default. */
if (channel_map.channels != sample_spec.channels) {
av_log(s, AV_LOG_WARNING, "Unknown channel. Using default channel map.\n");
channel_map.channels = 0;
}
} else
channel_map.channels = 0;
if (!channel_map.channels)
av_log(s, AV_LOG_WARNING, "Using PulseAudio's default channel map.\n");
else if (!pa_channel_map_valid(&channel_map)) {
av_log(s, AV_LOG_ERROR, "Invalid channel map.\n");
return AVERROR(EINVAL);
}
/* start main loop */
s->mainloop = pa_threaded_mainloop_new();
if (!s->mainloop) {
av_log(s, AV_LOG_ERROR, "Cannot create threaded mainloop.\n");
return AVERROR(ENOMEM);
}
if ((ret = pa_threaded_mainloop_start(s->mainloop)) < 0) {
av_log(s, AV_LOG_ERROR, "Cannot start threaded mainloop: %s.\n", pa_strerror(ret));
pa_threaded_mainloop_free(s->mainloop);
s->mainloop = NULL;
return AVERROR_EXTERNAL;
}
pa_threaded_mainloop_lock(s->mainloop);
mainloop_api = pa_threaded_mainloop_get_api(s->mainloop);
if (!mainloop_api) {
av_log(s, AV_LOG_ERROR, "Cannot get mainloop API.\n");
ret = AVERROR_EXTERNAL;
goto fail;
}
s->ctx = pa_context_new(mainloop_api, s->name);
if (!s->ctx) {
av_log(s, AV_LOG_ERROR, "Cannot create context.\n");
ret = AVERROR(ENOMEM);
goto fail;
}
pa_context_set_state_callback(s->ctx, pulse_context_state, s);
pa_context_set_subscribe_callback(s->ctx, pulse_event, h);
if ((ret = pa_context_connect(s->ctx, s->server, 0, NULL)) < 0) {
av_log(s, AV_LOG_ERROR, "Cannot connect context: %s.\n", pa_strerror(ret));
ret = AVERROR_EXTERNAL;
goto fail;
}
if ((ret = pulse_context_wait(s)) < 0) {
av_log(s, AV_LOG_ERROR, "Context failed.\n");
goto fail;
}
s->stream = pa_stream_new(s->ctx, stream_name, &sample_spec,
channel_map.channels ? &channel_map : NULL);
if ((ret = pulse_update_sink_info(h)) < 0) {
av_log(s, AV_LOG_ERROR, "Updating sink info failed.\n");
goto fail;
}
if (!s->stream) {
av_log(s, AV_LOG_ERROR, "Cannot create stream.\n");
ret = AVERROR(ENOMEM);
goto fail;
}
pa_stream_set_state_callback(s->stream, pulse_stream_state, s);
pa_stream_set_write_callback(s->stream, pulse_stream_writable, h);
pa_stream_set_overflow_callback(s->stream, pulse_overflow, h);
pa_stream_set_underflow_callback(s->stream, pulse_underflow, h);
if ((ret = pa_stream_connect_playback(s->stream, s->device, &buffer_attributes,
stream_flags, NULL, NULL)) < 0) {
av_log(s, AV_LOG_ERROR, "pa_stream_connect_playback failed: %s.\n", pa_strerror(ret));
ret = AVERROR_EXTERNAL;
goto fail;
}
if ((ret = pulse_stream_wait(s)) < 0) {
av_log(s, AV_LOG_ERROR, "Stream failed.\n");
goto fail;
}
/* read back buffer attributes for future use */
buffer_attributes = *pa_stream_get_buffer_attr(s->stream);
s->buffer_size = buffer_attributes.tlength;
s->prebuf = buffer_attributes.prebuf;
s->minreq = buffer_attributes.minreq;
av_log(s, AV_LOG_DEBUG, "Real buffer attributes: size: %d, prebuf: %d, minreq: %d\n",
s->buffer_size, s->prebuf, s->minreq);
pa_threaded_mainloop_unlock(s->mainloop);
if ((ret = pulse_subscribe_events(s)) < 0) {
av_log(s, AV_LOG_ERROR, "Event subscription failed.\n");
/* a bit ugly but the simplest to lock here*/
pa_threaded_mainloop_lock(s->mainloop);
goto fail;
}
/* force control messages */
s->mute = -1;
s->last_volume = PA_VOLUME_INVALID;
pa_threaded_mainloop_lock(s->mainloop);
if ((ret = pulse_update_sink_input_info(h)) < 0) {
av_log(s, AV_LOG_ERROR, "Updating sink input info failed.\n");
goto fail;
}
pa_threaded_mainloop_unlock(s->mainloop);
avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
return 0;
fail:
pa_threaded_mainloop_unlock(s->mainloop);
pulse_write_trailer(h);
return ret;
}
static int pulse_write_packet(AVFormatContext *h, AVPacket *pkt)
{
PulseData *s = h->priv_data;
int ret;
int64_t writable_size;
if (!pkt)
return pulse_flash_stream(s);
if (pkt->dts != AV_NOPTS_VALUE)
s->timestamp = pkt->dts;
if (pkt->duration) {
s->timestamp += pkt->duration;
} else {
AVStream *st = h->streams[0];
AVRational r = { 1, st->codecpar->sample_rate };
int64_t samples = pkt->size / (av_get_bytes_per_sample(st->codecpar->format) * st->codecpar->ch_layout.nb_channels);
s->timestamp += av_rescale_q(samples, r, st->time_base);
}
pa_threaded_mainloop_lock(s->mainloop);
if (!PA_STREAM_IS_GOOD(pa_stream_get_state(s->stream))) {
av_log(s, AV_LOG_ERROR, "PulseAudio stream is in invalid state.\n");
goto fail;
}
while (pa_stream_writable_size(s->stream) < s->minreq) {
if (s->nonblocking) {
pa_threaded_mainloop_unlock(s->mainloop);
return AVERROR(EAGAIN);
} else
pa_threaded_mainloop_wait(s->mainloop);
}
if ((ret = pa_stream_write(s->stream, pkt->data, pkt->size, NULL, 0, PA_SEEK_RELATIVE)) < 0) {
av_log(s, AV_LOG_ERROR, "pa_stream_write failed: %s\n", pa_strerror(ret));
goto fail;
}
if ((writable_size = pa_stream_writable_size(s->stream)) >= s->minreq)
avdevice_dev_to_app_control_message(h, AV_DEV_TO_APP_BUFFER_WRITABLE, &writable_size, sizeof(writable_size));
pa_threaded_mainloop_unlock(s->mainloop);
return 0;
fail:
pa_threaded_mainloop_unlock(s->mainloop);
return AVERROR_EXTERNAL;
}
static int pulse_write_frame(AVFormatContext *h, int stream_index,
AVFrame **frame, unsigned flags)
{
AVPacket pkt;
/* Planar formats are not supported yet. */
if (flags & AV_WRITE_UNCODED_FRAME_QUERY)
return av_sample_fmt_is_planar(h->streams[stream_index]->codecpar->format) ?
AVERROR(EINVAL) : 0;
pkt.data = (*frame)->data[0];
pkt.size = (*frame)->nb_samples * av_get_bytes_per_sample((*frame)->format) * (*frame)->ch_layout.nb_channels;
pkt.dts = (*frame)->pkt_dts;
pkt.duration = (*frame)->duration;
return pulse_write_packet(h, &pkt);
}
static void pulse_get_output_timestamp(AVFormatContext *h, int stream, int64_t *dts, int64_t *wall)
{
PulseData *s = h->priv_data;
pa_usec_t latency;
int neg;
pa_threaded_mainloop_lock(s->mainloop);
pa_stream_get_latency(s->stream, &latency, &neg);
pa_threaded_mainloop_unlock(s->mainloop);
if (wall)
*wall = av_gettime();
if (dts)
*dts = s->timestamp - (neg ? -latency : latency);
}
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, 1);
}
static int pulse_control_message(AVFormatContext *h, int type,
void *data, size_t data_size)
{
PulseData *s = h->priv_data;
int ret;
switch(type) {
case AV_APP_TO_DEV_PAUSE:
return pulse_set_pause(s, 1);
case AV_APP_TO_DEV_PLAY:
return pulse_set_pause(s, 0);
case AV_APP_TO_DEV_TOGGLE_PAUSE:
return pulse_set_pause(s, !pa_stream_is_corked(s->stream));
case AV_APP_TO_DEV_MUTE:
if (!s->mute) {
s->mute = 1;
return pulse_set_mute(s);
}
return 0;
case AV_APP_TO_DEV_UNMUTE:
if (s->mute) {
s->mute = 0;
return pulse_set_mute(s);
}
return 0;
case AV_APP_TO_DEV_TOGGLE_MUTE:
s->mute = !s->mute;
return pulse_set_mute(s);
case AV_APP_TO_DEV_SET_VOLUME:
return pulse_set_volume(s, *(double *)data);
case AV_APP_TO_DEV_GET_VOLUME:
s->last_volume = PA_VOLUME_INVALID;
pa_threaded_mainloop_lock(s->mainloop);
ret = pulse_update_sink_input_info(h);
pa_threaded_mainloop_unlock(s->mainloop);
return ret;
case AV_APP_TO_DEV_GET_MUTE:
s->mute = -1;
pa_threaded_mainloop_lock(s->mainloop);
ret = pulse_update_sink_input_info(h);
pa_threaded_mainloop_unlock(s->mainloop);
return ret;
default:
break;
}
return AVERROR(ENOSYS);
}
#define OFFSET(a) offsetof(PulseData, a)
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "server", "set PulseAudio server", OFFSET(server), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "name", "set application name", OFFSET(name), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, E },
{ "stream_name", "set stream description", OFFSET(stream_name), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "device", "set device name", OFFSET(device), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "buffer_size", "set buffer size in bytes", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
{ "buffer_duration", "set buffer duration in millisecs", OFFSET(buffer_duration), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
{ "prebuf", "set pre-buffering size", OFFSET(prebuf), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
{ "minreq", "set minimum request size", OFFSET(minreq), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
{ NULL }
};
static const AVClass pulse_muxer_class = {
.class_name = "PulseAudio outdev",
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
};
const FFOutputFormat ff_pulse_muxer = {
.p.name = "pulse",
.p.long_name = NULL_IF_CONFIG_SMALL("Pulse audio output"),
.priv_data_size = sizeof(PulseData),
.p.audio_codec = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE),
.p.video_codec = AV_CODEC_ID_NONE,
.write_header = pulse_write_header,
.write_packet = pulse_write_packet,
.write_uncoded_frame = pulse_write_frame,
.write_trailer = pulse_write_trailer,
.get_output_timestamp = pulse_get_output_timestamp,
.get_device_list = pulse_get_device_list,
.control_message = pulse_control_message,
#if FF_API_ALLOW_FLUSH
.p.flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
#else
.p.flags = AVFMT_NOFILE,
#endif
.p.priv_class = &pulse_muxer_class,
.flags_internal = FF_OFMT_FLAG_ALLOW_FLUSH,
};
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