[FFmpeg-cvslog] lavd/pulse_audio_enc: implement volume messages
Lukasz Marek
git at videolan.org
Fri Apr 18 05:04:09 CEST 2014
ffmpeg | branch: master | Lukasz Marek <lukasz.m.luki2 at gmail.com> | Tue Apr 15 22:07:09 2014 +0200| [eb9136a7d60e3a528f05ae9f9be34e4607b327bc] | committer: Lukasz Marek
lavd/pulse_audio_enc: implement volume messages
Signed-off-by: Lukasz Marek <lukasz.m.luki2 at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=eb9136a7d60e3a528f05ae9f9be34e4607b327bc
---
libavdevice/pulse_audio_enc.c | 246 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 246 insertions(+)
diff --git a/libavdevice/pulse_audio_enc.c b/libavdevice/pulse_audio_enc.c
index b05e126..4734214 100644
--- a/libavdevice/pulse_audio_enc.c
+++ b/libavdevice/pulse_audio_enc.c
@@ -18,6 +18,7 @@
* 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"
@@ -42,8 +43,123 @@ typedef struct PulseData {
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;
@@ -163,6 +279,68 @@ static int pulse_flash_stream(PulseData *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(lround(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(int64_t channel_layout, pa_channel_map *channel_map)
{
channel_map->channels = 0;
@@ -236,6 +414,7 @@ static av_cold int pulse_write_trailer(AVFormatContext *h)
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;
}
@@ -348,6 +527,7 @@ static av_cold int pulse_write_header(AVFormatContext *h)
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));
@@ -362,6 +542,12 @@ static av_cold int pulse_write_header(AVFormatContext *h)
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);
@@ -386,6 +572,23 @@ static av_cold int pulse_write_header(AVFormatContext *h)
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;
@@ -477,6 +680,48 @@ static int pulse_get_device_list(AVFormatContext *h, AVDeviceInfoList *device_li
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_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[] = {
@@ -509,6 +754,7 @@ AVOutputFormat ff_pulse_muxer = {
.write_trailer = pulse_write_trailer,
.get_output_timestamp = pulse_get_output_timestamp,
.get_device_list = pulse_get_device_list,
+ .control_message = pulse_control_message,
.flags = AVFMT_NOFILE | AVFMT_ALLOW_FLUSH,
.priv_class = &pulse_muxer_class,
};
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