--- /dev/null
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+ Contact: Nokia Corporation (qt-info@nokia.com)
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+
--- /dev/null
+/*
+ * GTA04 gsm voice routing utility
+ * Copyright (c) 2012 Radek Polak
+ *
+ * gta04-gsm-voice-routing 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.
+ *
+ * gta04-gsm-voice-routing 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 gta04-gsm-voice-routing; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*
+
+This program routes sound between GTA04 internal sound card ("default") and
+and UMTS modem sound card ("hw:1,0")
+
+The function can be written with following shell script:
+
+arecord -fS16_LE | aplay -Dhw:1,0 &
+arecord -Dhw:1,0 -fS16_LE | aplay
+
+However the program is written in C for better control over the process. E.g.
+we want to wait with routing until sound is available from UMTS.
+
+We have 4 streams called r0, p1, r1, p0
+
+r0 - record from hw:0,0 (default) internal sound card
+r1 - record from hw:1,0 umts sound card
+p0 - play on hw:0,0 (default) internal sound card
+p1 - play on hw:1,0 umts sound card
+
+All streams have rate 8000 (rate of umts sound card), 1 channel and 16bit per
+sample (SND_PCM_FORMAT_S16_LE).
+
+We set buffer_size of sound card to 1000.
+The sound card buffer consists of 4 periods.
+Period has 250 frames
+Frame has just one sample (one channel) and both sample and frame are 2 bytes
+
+We always play/record one period (250 samples, 500 bytes). At rate 8000Hz if
+we had 8000 samples it would be 1s, with 250 samples it makes 31.25ms long
+period - this is our latency.
+
+*/
+
+/* Use the newer ALSA API */
+#define ALSA_PCM_NEW_HW_PARAMS_API
+
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <alsa/asoundlib.h>
+
+#define ERR_PCM_OPEN_FAILED -1
+#define ERR_HW_PARAMS_ANY -2
+#define ERR_HW_PARAMS_SET_ACCESS -3
+#define ERR_HW_PARAMS_SET_FORMAT -4
+#define ERR_HW_PARAMS_SET_CHANNELS -5
+#define ERR_HW_PARAMS_SET_RATE -6
+#define ERR_SW_PARAMS_CURRENT -7
+#define ERR_HW_PARAMS_SET_PERIOD_SIZE -8
+#define ERR_HW_PARAMS_SET_BUFFER_SIZE -9
+#define ERR_HW_PARAMS -10
+#define ERR_BUFFER_ALLOC_FAILED -11
+#define ERR_SW_PARAMS_SET_START_THRESHOLD -12
+#define ERR_SW_PARAMS_SET_STOP_THRESHOLD -13
+#define ERR_SW_PARAMS -14
+#define ERR_READ_OVERRUN -15
+#define ERR_READ -16
+#define ERR_SHORT_READ -17
+#define ERR_WRITE_UNDERRUN -18
+#define ERR_WRITE -19
+#define ERR_SHORT_WRITE -20
+
+struct route_stream
+{
+ const char *id; // in: one of r0, r1, p0, p1
+ char *pcm_name; // in: "default" or "hw:1,0"
+ snd_pcm_stream_t stream; // in: SND_PCM_STREAM_PLAYBACK / SND_PCM_STREAM_CAPTURE
+ snd_pcm_uframes_t start_threshold; // in: start treshold or 0 to keep default
+ snd_pcm_uframes_t stop_threshold; // in: stop treshold or 0 to keep default
+ snd_pcm_uframes_t buffer_size; // in/out: hw buffer size, e.g. 1000 frames
+ snd_pcm_uframes_t period_size; // in/out: period size, e.g. 250 frames
+
+ snd_pcm_t *handle; // out: pcm handle
+ snd_pcm_hw_params_t *hwparams; // out:
+ snd_pcm_sw_params_t *swparams; // out:
+ int period_buffer_size; // out: size 2000 (250 frames=250 samples, one sample=2bytes)
+ char *period_buffer; // out: allocated buffer for playing/recording
+};
+
+/* Dump error on stderr with stream and error description, and return given
+ return_code */
+int err(const char *msg, int snd_err, struct route_stream *s, int return_code)
+{
+ fprintf(stderr, "%s (%s): ", s->id, s->pcm_name);
+ fprintf(stderr, msg);
+ if (snd_err < 0) {
+ fprintf(stderr, ": ", snd_strerror(snd_err));
+ }
+ fprintf(stderr, "\n");
+ return return_code;
+}
+
+int open_route_stream(struct route_stream *s)
+{
+ unsigned int val;
+ int dir;
+ int rc;
+ static snd_output_t *log;
+
+ /* Open PCM device for playback. */
+ rc = snd_pcm_open(&(s->handle), s->pcm_name, s->stream, 0);
+ if (rc < 0) {
+ return err("unable to open pcm device", rc, s, ERR_PCM_OPEN_FAILED);
+ }
+
+ /* Allocate a hardware parameters object. */
+ snd_pcm_hw_params_alloca(&(s->hwparams));
+
+ /* Fill it in with default values. */
+ rc = snd_pcm_hw_params_any(s->handle, s->hwparams);
+ if (rc < 0) {
+ return err("snd_pcm_hw_params_any failed", rc, s, ERR_HW_PARAMS_ANY);
+ }
+
+ /* Interleaved mode */
+ rc = snd_pcm_hw_params_set_access(s->handle, s->hwparams,
+ SND_PCM_ACCESS_RW_INTERLEAVED);
+ if (rc < 0) {
+ return err("snd_pcm_hw_params_set_access failed", rc, s,
+ ERR_HW_PARAMS_SET_ACCESS);
+ }
+
+ /* Signed 16-bit little-endian format */
+ rc = snd_pcm_hw_params_set_format(s->handle, s->hwparams,
+ SND_PCM_FORMAT_S16_LE);
+ if (rc < 0) {
+ return err("snd_pcm_hw_params_set_format failed", rc, s,
+ ERR_HW_PARAMS_SET_FORMAT);
+ }
+
+ /* One channel (mono) */
+ rc = snd_pcm_hw_params_set_channels(s->handle, s->hwparams, 1);
+ if (rc < 0) {
+ return err("snd_pcm_hw_params_set_channels failed", rc, s,
+ ERR_HW_PARAMS_SET_CHANNELS);
+ }
+
+ /* 8000 bits/second sampling rate (umts modem quality) */
+ rc = snd_pcm_hw_params_set_rate(s->handle, s->hwparams, 8000, 0);
+ if (rc < 0) {
+ return err("snd_pcm_hw_params_set_rate_near failed", rc, s,
+ ERR_HW_PARAMS_SET_RATE);
+ }
+
+ /* Period size in frames (e.g. 250) */
+ rc = snd_pcm_hw_params_set_period_size(s->handle, s->hwparams,
+ s->period_size, 0);
+ if (rc < 0) {
+ return err("snd_pcm_hw_params_set_period_size failed", rc, s,
+ ERR_HW_PARAMS_SET_PERIOD_SIZE);
+ }
+
+ /* Buffer size in frames (e.g. 1000) */
+ rc = snd_pcm_hw_params_set_buffer_size(s->handle, s->hwparams,
+ s->buffer_size);
+ if (rc < 0) {
+ return err("snd_pcm_hw_params_set_buffer_size failed", rc, s,
+ ERR_HW_PARAMS_SET_BUFFER_SIZE);
+ }
+
+ /* Write the parameters to the driver */
+ rc = snd_pcm_hw_params(s->handle, s->hwparams);
+ if (rc < 0) {
+ return err("snd_pcm_hw_params failed", rc, s, ERR_HW_PARAMS);
+ }
+
+ /* Allocate buffer for one period twice as big as period_size because:
+ 1 frame = 1 sample = 2 bytes because of S16_LE and 1 channel */
+ s->period_buffer_size = 2 * s->period_size;
+ s->period_buffer = (char *)malloc(s->period_buffer_size);
+ if (s->period_buffer == 0) {
+ return err("period_buffer alloc failed", 0, s, ERR_BUFFER_ALLOC_FAILED);
+ }
+
+ /* Setup software params */
+ if (s->start_threshold > 0 || s->stop_threshold > 0) {
+ snd_pcm_sw_params_alloca(&(s->swparams));
+
+ rc = snd_pcm_sw_params_current(s->handle, s->swparams);
+ if (rc < 0) {
+ return err("snd_pcm_sw_params_current failed", rc, s,
+ ERR_SW_PARAMS_CURRENT);
+ }
+
+ /* start_threshold */
+ if (s->start_threshold > 0) {
+ rc = snd_pcm_sw_params_set_start_threshold(s->handle,
+ s->swparams,
+ s->start_threshold);
+ if (rc < 0) {
+ return err("snd_pcm_sw_params_set_start_threshold failed", rc,
+ s, ERR_SW_PARAMS_SET_START_THRESHOLD);
+ }
+ }
+
+ /* stop_threshold */
+ if (s->stop_threshold > 0) {
+ rc = snd_pcm_sw_params_set_stop_threshold(s->handle,
+ s->swparams,
+ s->stop_threshold);
+ if (rc < 0) {
+ return err("snd_pcm_sw_params_set_start_threshold failed", rc,
+ s, ERR_SW_PARAMS_SET_STOP_THRESHOLD);
+ }
+ }
+
+ rc = snd_pcm_sw_params(s->handle, s->swparams);
+ if (rc < 0) {
+ return err("snd_pcm_sw_params failed", rc, s, ERR_SW_PARAMS);
+ }
+ }
+
+ /* Uncomment to dump hw setup */
+ /* snd_output_stdio_attach(&log, stderr, 0);
+ snd_pcm_dump(s->handle, log);
+ snd_output_close(log); */
+
+ return 0;
+}
+
+int close_route_stream(struct route_stream *s)
+{
+ if (s->handle == 0) {
+ return 0;
+ }
+ snd_pcm_drain(s->handle);
+ snd_pcm_close(s->handle);
+ if (s->period_buffer == 0) {
+ return 0;
+ }
+ free(s->period_buffer);
+ return 0;
+}
+
+void open_route_stream_repeated(struct route_stream *s)
+{
+ int rc;
+ for (;;) {
+ rc = open_route_stream(s);
+ if (rc == 0) {
+ return;
+ }
+ close_route_stream(s);
+ fprintf(stderr, "retrying in 100 ms\n");
+ usleep(1000 * 100);
+ }
+}
+
+int route_stream_read(struct route_stream *s)
+{
+ int rc;
+
+ rc = snd_pcm_readi(s->handle, s->period_buffer, s->period_size);
+ if (rc == s->period_size) {
+ return 0;
+ }
+
+ /* EPIPE means overrun */
+ if (rc == -EPIPE) {
+ err("overrun occured", rc, s, ERR_READ_OVERRUN);
+ snd_pcm_prepare(s->handle);
+ return ERR_READ_OVERRUN;
+ }
+
+ if (rc < 0) {
+ return err("snd_pcm_readi failed", rc, s, ERR_READ);
+ }
+
+ return err("short read", rc, s, ERR_SHORT_READ);
+}
+
+int route_stream_write(struct route_stream *s)
+{
+ int rc;
+
+ rc = snd_pcm_writei(s->handle, s->period_buffer, s->period_size);
+ if (rc == s->period_size) {
+ return 0;
+ }
+
+ /* EPIPE means underrun */
+ if (rc == -EPIPE) {
+ err("underrun occured", rc, s, ERR_WRITE_UNDERRUN);
+ snd_pcm_prepare(s->handle);
+ return ERR_WRITE_UNDERRUN;
+ }
+
+ if (rc < 0) {
+ return err("snd_pcm_writei failed", rc, s, ERR_WRITE);
+ }
+
+ return err("short write", rc, s, ERR_SHORT_WRITE);
+}
+
+void log_with_timestamp(const char *msg)
+{
+ struct timespec tp;
+ clock_gettime(CLOCK_MONOTONIC, &tp);
+ fprintf(stderr, "%d %d: %s\n", tp.tv_sec, tp.tv_nsec, msg);
+}
+
+int main()
+{
+ int rc;
+ int started = 0;
+
+ struct route_stream p0 = {
+ .id = "p0",
+ .pcm_name = "default",
+ .stream = SND_PCM_STREAM_PLAYBACK,
+ .start_threshold = 1000,
+ .stop_threshold = 1000,
+ .buffer_size = 1000,
+ .period_size = 250,
+ .handle = 0,
+ .period_buffer = 0
+ };
+
+ struct route_stream r0 = {
+ .id = "r0",
+ .pcm_name = "default",
+ .stream = SND_PCM_STREAM_CAPTURE,
+ .start_threshold = 0,
+ .stop_threshold = 0,
+ .buffer_size = 1000,
+ .period_size = 250,
+ .handle = 0,
+ .period_buffer = 0
+ };
+
+ struct route_stream p1 = {
+ .id = "p1",
+ .pcm_name = "hw:1,0",
+ .stream = SND_PCM_STREAM_PLAYBACK,
+ .start_threshold = 1000,
+ .stop_threshold = 1000,
+ .buffer_size = 1000,
+ .period_size = 250,
+ .handle = 0,
+ .period_buffer = 0
+ };
+
+ struct route_stream r1 = {
+ .id = "r1",
+ .pcm_name = "hw:1,0",
+ .stream = SND_PCM_STREAM_CAPTURE,
+ .start_threshold = 0,
+ .stop_threshold = 0,
+ .buffer_size = 1000,
+ .period_size = 250,
+ .handle = 0,
+ .period_buffer = 0
+ };
+
+ /* Open streams - umts first */
+ open_route_stream_repeated(&p1);
+ open_route_stream_repeated(&r1);
+ open_route_stream_repeated(&p0);
+ open_route_stream_repeated(&r0);
+
+ /* Route sound */
+ for (;;) {
+
+ /* Recording - first from internal card (so that we always clean the
+ recording buffer), then UMTS, which can fail */
+ if (route_stream_read(&r0)) {
+ continue;
+ }
+
+ rc = route_stream_read(&r1);
+ if (rc == ERR_READ && started) {
+ fprintf(stderr, "read error after some succesful routing (hangup)\n");
+ return 0;
+ }
+ if (rc != 0) {
+ continue;
+ }
+
+ started = 1;
+
+ memmove(p0.period_buffer, r1.period_buffer, r1.period_buffer_size);
+ route_stream_write(&p0);
+
+ memmove(p1.period_buffer, r0.period_buffer, r0.period_buffer_size);
+ route_stream_write(&p1);
+ }
+
+ close_route_stream(&p0);
+ close_route_stream(&p1);
+ close_route_stream(&r0);
+ close_route_stream(&r1);
+
+ return 0;
+}
git / gta04-gsm-voice-routing.git / commitdiff