X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=hardware%2Falsa%2Falsa.c;h=994183fc1dd20ce16cd60500927f89e76c71cb47;hb=d261dbbfcc73;hp=94a95723adc4eea6ddd06df3a5c980f70ada848b;hpb=5097b0d0912165429aceddb5febbf68467b623f5;p=libsigrok.git diff --git a/hardware/alsa/alsa.c b/hardware/alsa/alsa.c index 94a95723..994183fc 100644 --- a/hardware/alsa/alsa.c +++ b/hardware/alsa/alsa.c @@ -48,6 +48,7 @@ static int hwcaps[] = { SR_HWCAP_CONTINUOUS, }; +/* TODO: Which probe names/numbers to use? */ static const char *probe_names[NUM_PROBES + 1] = { "0", "1", @@ -56,7 +57,8 @@ static const char *probe_names[NUM_PROBES + 1] = { static GSList *dev_insts = NULL; -struct alsa { +/* Private, per-device-instance driver context. */ +struct context { uint64_t cur_rate; uint64_t limit_samples; snd_pcm_t *capture_handle; @@ -67,57 +69,58 @@ struct alsa { static int hw_init(const char *devinfo) { struct sr_dev_inst *sdi; - struct alsa *alsa; + struct context *ctx; /* Avoid compiler warnings. */ - devinfo = devinfo; + (void)devinfo; - if (!(alsa = g_try_malloc0(sizeof(struct alsa)))) { - sr_err("alsa: %s: alsa malloc failed", __func__); + if (!(ctx = g_try_malloc0(sizeof(struct context)))) { + sr_err("alsa: %s: ctx malloc failed", __func__); return 0; } - sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL); - if (!sdi) - goto free_alsa; + if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL))) { + sr_err("alsa: %s: sdi was NULL", __func__); + goto free_ctx; + } - sdi->priv = alsa; + sdi->priv = ctx; dev_insts = g_slist_append(dev_insts, sdi); return 1; -free_alsa: - g_free(alsa); +free_ctx: + g_free(ctx); return 0; } -static int hw_opendev(int dev_index) +static int hw_dev_open(int dev_index) { struct sr_dev_inst *sdi; - struct alsa *alsa; + struct context *ctx; int err; if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) return SR_ERR; - alsa = sdi->priv; + ctx = sdi->priv; - err = snd_pcm_open(&alsa->capture_handle, AUDIO_DEV, - SND_PCM_STREAM_CAPTURE, 0); + err = snd_pcm_open(&ctx->capture_handle, AUDIO_DEV, + SND_PCM_STREAM_CAPTURE, 0); if (err < 0) { sr_err("alsa: can't open audio device %s (%s)", AUDIO_DEV, snd_strerror(err)); return SR_ERR; } - err = snd_pcm_hw_params_malloc(&alsa->hw_params); + err = snd_pcm_hw_params_malloc(&ctx->hw_params); if (err < 0) { sr_err("alsa: can't allocate hardware parameter structure (%s)", snd_strerror(err)); return SR_ERR; } - err = snd_pcm_hw_params_any(alsa->capture_handle, alsa->hw_params); + err = snd_pcm_hw_params_any(ctx->capture_handle, ctx->hw_params); if (err < 0) { sr_err("alsa: can't initialize hardware parameter structure " "(%s)", snd_strerror(err)); @@ -127,26 +130,26 @@ static int hw_opendev(int dev_index) return SR_OK; } -static int hw_closedev(int dev_index) +static int hw_dev_close(int dev_index) { struct sr_dev_inst *sdi; - struct alsa *alsa; + struct context *ctx; if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) { sr_err("alsa: %s: sdi was NULL", __func__); return SR_ERR; /* TODO: SR_ERR_ARG? */ } - if (!(alsa = sdi->priv)) { + if (!(ctx = sdi->priv)) { sr_err("alsa: %s: sdi->priv was NULL", __func__); return SR_ERR; /* TODO: SR_ERR_ARG? */ } // TODO: Return values of snd_*? - if (alsa->hw_params) - snd_pcm_hw_params_free(alsa->hw_params); - if (alsa->capture_handle) - snd_pcm_close(alsa->capture_handle); + if (ctx->hw_params) + snd_pcm_hw_params_free(ctx->hw_params); + if (ctx->capture_handle) + snd_pcm_close(ctx->capture_handle); return SR_OK; } @@ -168,12 +171,12 @@ static int hw_cleanup(void) static void *hw_dev_info_get(int dev_index, int dev_info_id) { struct sr_dev_inst *sdi; - struct alsa *alsa; + struct context *ctx; void *info = NULL; if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) return NULL; - alsa = sdi->priv; + ctx = sdi->priv; switch (dev_info_id) { case SR_DI_INST: @@ -186,7 +189,7 @@ static void *hw_dev_info_get(int dev_index, int dev_info_id) info = probe_names; break; case SR_DI_CUR_SAMPLERATE: - info = &alsa->cur_rate; + info = &ctx->cur_rate; break; // case SR_DI_PROBE_TYPE: // info = GINT_TO_POINTER(SR_PROBE_TYPE_ANALOG); @@ -196,7 +199,7 @@ static void *hw_dev_info_get(int dev_index, int dev_info_id) return info; } -static int hw_get_status(int dev_index) +static int hw_dev_status_get(int dev_index) { /* Avoid compiler warnings. */ dev_index = dev_index; @@ -209,23 +212,23 @@ static int *hw_hwcap_get_all(void) return hwcaps; } -static int hw_config_set(int dev_index, int hwcap, void *value) +static int hw_dev_config_set(int dev_index, int hwcap, void *value) { struct sr_dev_inst *sdi; - struct alsa *alsa; + struct context *ctx; if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) return SR_ERR; - alsa = sdi->priv; + ctx = sdi->priv; switch (hwcap) { case SR_HWCAP_PROBECONFIG: return SR_OK; case SR_HWCAP_SAMPLERATE: - alsa->cur_rate = *(uint64_t *) value; + ctx->cur_rate = *(uint64_t *)value; return SR_OK; case SR_HWCAP_LIMIT_SAMPLES: - alsa->limit_samples = *(uint64_t *) value; + ctx->limit_samples = *(uint64_t *)value; return SR_OK; default: return SR_ERR; @@ -235,7 +238,7 @@ static int hw_config_set(int dev_index, int hwcap, void *value) static int receive_data(int fd, int revents, void *user_data) { struct sr_dev_inst *sdi = user_data; - struct alsa *alsa = sdi->priv; + struct context *ctx = sdi->priv; struct sr_datafeed_packet packet; struct sr_analog_sample *sample; unsigned int sample_size = sizeof(struct sr_analog_sample) + @@ -249,8 +252,8 @@ static int receive_data(int fd, int revents, void *user_data) do { memset(inb, 0, sizeof(inb)); - count = snd_pcm_readi(alsa->capture_handle, inb, - MIN(4096/4, alsa->limit_samples)); + count = snd_pcm_readi(ctx->capture_handle, inb, + MIN(4096 / 4, ctx->limit_samples)); if (count < 1) { sr_err("alsa: Failed to read samples"); return FALSE; @@ -268,7 +271,7 @@ static int receive_data(int fd, int revents, void *user_data) for (x = 0; x < NUM_PROBES; x++) { sample->probes[x].val = - *(uint16_t *) (inb + (i * 4) + (x * 2)); + *(uint16_t *)(inb + (i * 4) + (x * 2)); sample->probes[x].val &= ((1 << 16) - 1); sample->probes[x].res = 16; } @@ -280,9 +283,9 @@ static int receive_data(int fd, int revents, void *user_data) packet.payload = outb; sr_session_bus(user_data, &packet); g_free(outb); - alsa->limit_samples -= count; + ctx->limit_samples -= count; - } while (alsa->limit_samples > 0); + } while (ctx->limit_samples > 0); packet.type = SR_DF_END; sr_session_bus(user_data, &packet); @@ -290,10 +293,10 @@ static int receive_data(int fd, int revents, void *user_data) return TRUE; } -static int hw_start_acquisition(int dev_index, gpointer session_dev_id) +static int hw_dev_acquisition_start(int dev_index, gpointer session_dev_id) { struct sr_dev_inst *sdi; - struct alsa *alsa; + struct context *ctx; struct sr_datafeed_packet packet; struct sr_datafeed_header header; struct pollfd *ufds; @@ -302,51 +305,51 @@ static int hw_start_acquisition(int dev_index, gpointer session_dev_id) if (!(sdi = sr_dev_inst_get(dev_insts, dev_index))) return SR_ERR; - alsa = sdi->priv; + ctx = sdi->priv; - err = snd_pcm_hw_params_set_access(alsa->capture_handle, - alsa->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); + err = snd_pcm_hw_params_set_access(ctx->capture_handle, + ctx->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); if (err < 0) { sr_err("alsa: can't set access type (%s)", snd_strerror(err)); return SR_ERR; } /* FIXME: Hardcoded for 16bits */ - err = snd_pcm_hw_params_set_format(alsa->capture_handle, - alsa->hw_params, SND_PCM_FORMAT_S16_LE); + err = snd_pcm_hw_params_set_format(ctx->capture_handle, + ctx->hw_params, SND_PCM_FORMAT_S16_LE); if (err < 0) { sr_err("alsa: can't set sample format (%s)", snd_strerror(err)); return SR_ERR; } - err = snd_pcm_hw_params_set_rate_near(alsa->capture_handle, - alsa->hw_params, (unsigned int *) &alsa->cur_rate, 0); + err = snd_pcm_hw_params_set_rate_near(ctx->capture_handle, + ctx->hw_params, (unsigned int *)&ctx->cur_rate, 0); if (err < 0) { sr_err("alsa: can't set sample rate (%s)", snd_strerror(err)); return SR_ERR; } - err = snd_pcm_hw_params_set_channels(alsa->capture_handle, - alsa->hw_params, NUM_PROBES); + err = snd_pcm_hw_params_set_channels(ctx->capture_handle, + ctx->hw_params, NUM_PROBES); if (err < 0) { sr_err("alsa: can't set channel count (%s)", snd_strerror(err)); return SR_ERR; } - err = snd_pcm_hw_params(alsa->capture_handle, alsa->hw_params); + err = snd_pcm_hw_params(ctx->capture_handle, ctx->hw_params); if (err < 0) { sr_err("alsa: can't set parameters (%s)", snd_strerror(err)); return SR_ERR; } - err = snd_pcm_prepare(alsa->capture_handle); + err = snd_pcm_prepare(ctx->capture_handle); if (err < 0) { sr_err("alsa: can't prepare audio interface for use (%s)", snd_strerror(err)); return SR_ERR; } - count = snd_pcm_poll_descriptors_count(alsa->capture_handle); + count = snd_pcm_poll_descriptors_count(ctx->capture_handle); if (count < 1) { sr_err("alsa: Unable to obtain poll descriptors count"); return SR_ERR; @@ -357,7 +360,7 @@ static int hw_start_acquisition(int dev_index, gpointer session_dev_id) return SR_ERR_MALLOC; } - err = snd_pcm_poll_descriptors(alsa->capture_handle, ufds, count); + err = snd_pcm_poll_descriptors(ctx->capture_handle, ufds, count); if (err < 0) { sr_err("alsa: Unable to obtain poll descriptors (%s)", snd_strerror(err)); @@ -365,15 +368,15 @@ static int hw_start_acquisition(int dev_index, gpointer session_dev_id) return SR_ERR; } - alsa->session_id = session_dev_id; + ctx->session_id = session_dev_id; sr_source_add(ufds[0].fd, ufds[0].events, 10, receive_data, sdi); packet.type = SR_DF_HEADER; packet.length = sizeof(struct sr_datafeed_header); - packet.payload = (unsigned char *) &header; + packet.payload = (unsigned char *)&header; header.feed_version = 1; gettimeofday(&header.starttime, NULL); - header.samplerate = alsa->cur_rate; + header.samplerate = ctx->cur_rate; header.num_analog_probes = NUM_PROBES; header.num_logic_probes = 0; header.protocol_id = SR_PROTO_RAW; @@ -383,7 +386,7 @@ static int hw_start_acquisition(int dev_index, gpointer session_dev_id) return SR_OK; } -static int hw_stop_acquisition(int dev_index, gpointer session_dev_id) +static int hw_dev_acquisition_stop(int dev_index, gpointer session_dev_id) { /* Avoid compiler warnings. */ dev_index = dev_index; @@ -398,12 +401,12 @@ SR_PRIV struct sr_dev_plugin alsa_plugin_info = { .api_version = 1, .init = hw_init, .cleanup = hw_cleanup, - .opendev = hw_opendev, - .closedev = hw_closedev, + .dev_open = hw_dev_open, + .dev_close = hw_dev_close, .dev_info_get = hw_dev_info_get, - .get_status = hw_get_status, + .dev_status_get = hw_dev_status_get, .hwcap_get_all = hw_hwcap_get_all, - .config_set = hw_config_set, - .start_acquisition = hw_start_acquisition, - .stop_acquisition = hw_stop_acquisition, + .dev_config_set = hw_dev_config_set, + .dev_acquisition_start = hw_dev_acquisition_start, + .dev_acquisition_stop = hw_dev_acquisition_stop, };