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https://gitlab.freedesktop.org/pipewire/pipewire.git
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tools: add pw-loopback
Sends the captured data from a source directly to a sink. It uses an input and output stream so the source and sink can be moved in pavucontrol, channel remixing is possible and the volume can be adjusted. See #959
This commit is contained in:
Wim Taymans
parent
20b8426013
commit
4bcb7e0468
2 changed files with 331 additions and 0 deletions
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@ -45,6 +45,13 @@ executable('pw-metadata',
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dependencies : [pipewire_dep],
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)
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executable('pw-loopback',
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[ 'pw-loopback.c'],
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c_args : [ '-D_GNU_SOURCE' ],
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install: true,
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dependencies : [pipewire_dep],
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)
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if ncurses_dep.found()
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executable('pw-top',
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'pw-top.c',
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324
src/tools/pw-loopback.c
Normal file
324
src/tools/pw-loopback.c
Normal file
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@ -0,0 +1,324 @@
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/* PipeWire
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*
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* Copyright © 2021 Wim Taymans <wim.taymans@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <getopt.h>
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#include <limits.h>
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#include <math.h>
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#include <spa/utils/result.h>
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#include <spa/pod/builder.h>
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#include <spa/param/format.h>
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#include <spa/param/audio/raw.h>
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#include <pipewire/pipewire.h>
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#define DEFAULT_RATE 48000
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#define DEFAULT_CHANNELS 2
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#define DEFAULT_CHANNEL_MAP "[ FL, FR ]"
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struct data {
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struct pw_main_loop *loop;
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struct pw_context *context;
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struct pw_core *core;
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struct spa_hook core_listener;
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const char *opt_group_name;
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const char *opt_channel_map;
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uint32_t channels;
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uint32_t latency;
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struct pw_properties *capture_props;
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struct pw_stream *capture;
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struct spa_hook capture_listener;
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struct pw_properties *playback_props;
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struct pw_stream *playback;
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struct spa_hook playback_listener;
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};
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static void capture_process(void *d)
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{
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struct data *data = d;
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struct pw_buffer *in, *out;
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if ((in = pw_stream_dequeue_buffer(data->capture)) == NULL) {
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pw_log_warn("out of capture buffers: %m");
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return;
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}
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if ((out = pw_stream_dequeue_buffer(data->playback)) == NULL) {
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pw_log_warn("out of playback buffers: %m");
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return;
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}
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*out->buffer = *in->buffer;
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pw_stream_queue_buffer(data->capture, in);
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pw_stream_queue_buffer(data->playback, out);
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}
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static const struct pw_stream_events in_stream_events = {
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PW_VERSION_STREAM_EVENTS,
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.process = capture_process
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};
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static const struct pw_stream_events out_stream_events = {
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PW_VERSION_STREAM_EVENTS,
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};
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static int setup_streams(struct data *data)
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{
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int res;
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uint32_t n_params;
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const struct spa_pod *params[1];
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uint8_t buffer[1024];
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struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
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data->capture = pw_stream_new(data->core,
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"loopback capture", pw_properties_copy(data->capture_props));
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if (data->capture == NULL)
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return -errno;
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pw_stream_add_listener(data->capture,
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&data->capture_listener,
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&in_stream_events, data);
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data->playback = pw_stream_new(data->core,
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"loopback playback", pw_properties_copy(data->playback_props));
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if (data->playback == NULL)
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return -errno;
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pw_stream_add_listener(data->playback,
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&data->playback_listener,
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&out_stream_events, data);
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n_params = 0;
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params[n_params++] = spa_pod_builder_add_object(&b,
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SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
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SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_audio),
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SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
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SPA_FORMAT_AUDIO_format, SPA_POD_Id(SPA_AUDIO_FORMAT_F32P),
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SPA_FORMAT_AUDIO_channels, SPA_POD_Int(data->channels));
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if ((res = pw_stream_connect(data->capture,
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PW_DIRECTION_INPUT,
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PW_ID_ANY,
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PW_STREAM_FLAG_AUTOCONNECT |
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PW_STREAM_FLAG_MAP_BUFFERS |
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PW_STREAM_FLAG_RT_PROCESS,
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params, n_params)) < 0)
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return res;
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if ((res = pw_stream_connect(data->playback,
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PW_DIRECTION_OUTPUT,
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PW_ID_ANY,
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PW_STREAM_FLAG_AUTOCONNECT |
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PW_STREAM_FLAG_MAP_BUFFERS |
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PW_STREAM_FLAG_RT_PROCESS,
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params, n_params)) < 0)
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return res;
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return 0;
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}
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static void on_core_error(void *data, uint32_t id, int seq, int res, const char *message)
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{
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struct data *d = data;
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pw_log_error("error id:%u seq:%d res:%d (%s): %s",
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id, seq, res, spa_strerror(res), message);
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if (id == PW_ID_CORE && res == -EPIPE)
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pw_main_loop_quit(d->loop);
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}
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static const struct pw_core_events core_events = {
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PW_VERSION_CORE_EVENTS,
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.error = on_core_error,
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};
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static void do_quit(void *data, int signal_number)
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{
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struct data *d = data;
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pw_main_loop_quit(d->loop);
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}
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static void show_help(struct data *data, const char *name)
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{
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fprintf(stdout, "%s [options] [<id>]\n"
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" -h, --help Show this help\n"
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" --version Show version\n"
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" -r, --remote Remote daemon name\n"
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" -g, --group Node group (default '%s')\n"
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" -c, --channels Number of channels (default %d)\n"
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" -m, --channel-map Channel map (default '%s')\n"
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" -l, --latency Desired latency in ms\n"
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" -C --capture Capture source to connect to\n"
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" --capture-props Capture stream properties\n"
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" -P --playback Playback sink to connect to\n"
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" --playback-props Playback stream properties\n",
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name,
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data->opt_group_name,
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data->channels,
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data->opt_channel_map);
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}
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int main(int argc, char *argv[])
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{
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struct data data = { 0 };
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struct pw_loop *l;
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const char *opt_remote = NULL;
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char cname[256];
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static const struct option long_options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, 'V' },
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{ "remote", required_argument, NULL, 'r' },
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{ "group", required_argument, NULL, 'g' },
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{ "channels", required_argument, NULL, 'c' },
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{ "latency", required_argument, NULL, 'l' },
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{ "capture", required_argument, NULL, 'C' },
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{ "playback", required_argument, NULL, 'P' },
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{ "capture-props", required_argument, NULL, 'i' },
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{ "playback-props", required_argument, NULL, 'o' },
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{ NULL, 0, NULL, 0}
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};
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int c;
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pw_init(&argc, &argv);
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data.channels = DEFAULT_CHANNELS;
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data.opt_channel_map = DEFAULT_CHANNEL_MAP;
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data.opt_group_name = pw_get_client_name();
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if (snprintf(cname, sizeof(cname), "%s-%zd", argv[0], (size_t) getpid()) > 0)
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data.opt_group_name = cname;
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data.capture_props = pw_properties_new(NULL, NULL);
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data.playback_props = pw_properties_new(NULL, NULL);
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if (data.capture_props == NULL || data.playback_props == NULL) {
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fprintf(stderr, "can't create properties: %m\n");
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return -1;
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}
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while ((c = getopt_long(argc, argv, "hVr:g:c:m:l:C:P:i:o:", long_options, NULL)) != -1) {
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switch (c) {
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case 'h':
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show_help(&data, argv[0]);
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return 0;
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case 'V':
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fprintf(stdout, "%s\n"
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"Compiled with libpipewire %s\n"
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"Linked with libpipewire %s\n",
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argv[0],
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pw_get_headers_version(),
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pw_get_library_version());
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return 0;
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case 'r':
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opt_remote = optarg;
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break;
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case 'g':
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data.opt_group_name = optarg;
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break;
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case 'c':
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data.channels = atoi(optarg);
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break;
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case 'm':
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data.opt_channel_map = optarg;
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break;
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case 'l':
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data.latency = atoi(optarg) * DEFAULT_RATE / SPA_MSEC_PER_SEC;
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break;
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case 'C':
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pw_properties_set(data.capture_props, PW_KEY_NODE_TARGET, optarg);
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break;
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case 'P':
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pw_properties_set(data.playback_props, PW_KEY_NODE_TARGET, optarg);
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break;
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case 'i':
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pw_properties_update_string(data.capture_props, optarg, strlen(optarg));
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break;
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case 'o':
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pw_properties_update_string(data.playback_props, optarg, strlen(optarg));
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break;
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default:
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show_help(&data, argv[0]);
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return -1;
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}
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}
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data.loop = pw_main_loop_new(NULL);
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if (data.loop == NULL) {
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fprintf(stderr, "can't create main loop: %m\n");
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return -1;
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}
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l = pw_main_loop_get_loop(data.loop);
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pw_loop_add_signal(l, SIGINT, do_quit, &data);
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pw_loop_add_signal(l, SIGTERM, do_quit, &data);
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data.context = pw_context_new(l, NULL, 0);
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if (data.context == NULL) {
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fprintf(stderr, "can't create context: %m\n");
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return -1;
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}
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if (data.opt_group_name != NULL) {
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pw_properties_set(data.capture_props, PW_KEY_NODE_GROUP, data.opt_group_name);
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pw_properties_set(data.playback_props, PW_KEY_NODE_GROUP, data.opt_group_name);
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}
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if (data.latency != 0) {
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pw_properties_setf(data.capture_props, PW_KEY_NODE_LATENCY, "%u/%u",
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data.latency, DEFAULT_RATE);
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pw_properties_setf(data.playback_props, PW_KEY_NODE_LATENCY, "%u/%u",
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data.latency, DEFAULT_RATE);
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}
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data.core = pw_context_connect(data.context,
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pw_properties_new(
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PW_KEY_REMOTE_NAME, opt_remote,
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NULL),
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0);
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if (data.core == NULL) {
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fprintf(stderr, "can't connect: %m\n");
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return -1;
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}
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pw_core_add_listener(data.core,
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&data.core_listener,
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&core_events, &data);
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setup_streams(&data);
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pw_main_loop_run(data.loop);
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pw_context_destroy(data.context);
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pw_main_loop_destroy(data.loop);
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pw_deinit();
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return 0;
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}
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