From eb9136a7d60e3a528f05ae9f9be34e4607b327bc Mon Sep 17 00:00:00 2001 From: Lukasz Marek Date: Tue, 15 Apr 2014 22:07:09 +0200 Subject: [PATCH] lavd/pulse_audio_enc: implement volume messages Signed-off-by: Lukasz Marek --- 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 b05e12680e..473421474e 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 #include #include #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, };