GstCaps * gst_alsa_probe_supported_formats (GstObject * obj, gchar * device, snd_pcm_t * handle, const GstCaps * template_caps) { snd_pcm_hw_params_t *hw_params; snd_pcm_stream_t stream_type; GstCaps *caps; gint err; snd_pcm_hw_params_malloc (&hw_params); if ((err = snd_pcm_hw_params_any (handle, hw_params)) < 0) goto error; stream_type = snd_pcm_stream (handle); caps = gst_caps_copy (template_caps); if (!(caps = gst_alsa_detect_formats (obj, hw_params, caps))) goto subroutine_error; if (!(caps = gst_alsa_detect_rates (obj, hw_params, caps))) goto subroutine_error; if (!(caps = gst_alsa_detect_channels (obj, hw_params, caps))) goto subroutine_error; /* Try opening IEC958 device to see if we can support that format (playback * only for now but we could add SPDIF capture later) */ if (stream_type == SND_PCM_STREAM_PLAYBACK) { snd_pcm_t *pcm = gst_alsa_open_iec958_pcm (obj, device); if (G_LIKELY (pcm)) { gst_caps_append (caps, gst_caps_from_string (PASSTHROUGH_CAPS)); snd_pcm_close (pcm); } } snd_pcm_hw_params_free (hw_params); return caps; /* ERRORS */ error: { GST_ERROR_OBJECT (obj, "failed to query formats: %s", snd_strerror (err)); snd_pcm_hw_params_free (hw_params); return NULL; } subroutine_error: { GST_ERROR_OBJECT (obj, "failed to query formats"); snd_pcm_hw_params_free (hw_params); return NULL; } }
static gboolean gst_alsasink_prepare (GstAudioSink * asink, GstRingBufferSpec * spec) { GstAlsaSink *alsa; gint err; alsa = GST_ALSA_SINK (asink); if (alsa->iec958) { snd_pcm_close (alsa->handle); alsa->handle = gst_alsa_open_iec958_pcm (GST_OBJECT (alsa), alsa->device); if (G_UNLIKELY (!alsa->handle)) { goto no_iec958; } } if (!alsasink_parse_spec (alsa, spec)) goto spec_parse; CHECK (set_hwparams (alsa), hw_params_failed); CHECK (set_swparams (alsa), sw_params_failed); alsa->bytes_per_sample = spec->bytes_per_sample; spec->segsize = alsa->period_size * spec->bytes_per_sample; spec->segtotal = alsa->buffer_size / alsa->period_size; { snd_output_t *out_buf = NULL; char *msg = NULL; snd_output_buffer_open (&out_buf); snd_pcm_dump_hw_setup (alsa->handle, out_buf); snd_output_buffer_string (out_buf, &msg); GST_DEBUG_OBJECT (alsa, "Hardware setup: \n%s", msg); snd_output_close (out_buf); snd_output_buffer_open (&out_buf); snd_pcm_dump_sw_setup (alsa->handle, out_buf); snd_output_buffer_string (out_buf, &msg); GST_DEBUG_OBJECT (alsa, "Software setup: \n%s", msg); snd_output_close (out_buf); } return TRUE; /* ERRORS */ no_iec958: { GST_ELEMENT_ERROR (alsa, RESOURCE, OPEN_WRITE, (NULL), ("Could not open IEC958 (SPDIF) device for playback")); return FALSE; } spec_parse: { GST_ELEMENT_ERROR (alsa, RESOURCE, SETTINGS, (NULL), ("Error parsing spec")); return FALSE; } hw_params_failed: { GST_ELEMENT_ERROR (alsa, RESOURCE, SETTINGS, (NULL), ("Setting of hwparams failed: %s", snd_strerror (err))); return FALSE; } sw_params_failed: { GST_ELEMENT_ERROR (alsa, RESOURCE, SETTINGS, (NULL), ("Setting of swparams failed: %s", snd_strerror (err))); return FALSE; } }
static gboolean gst_alsasink_prepare (GstAudioSink * asink, GstAudioRingBufferSpec * spec) { GstAlsaSink *alsa; gint err; alsa = GST_ALSA_SINK (asink); if (alsa->iec958) { snd_pcm_close (alsa->handle); alsa->handle = gst_alsa_open_iec958_pcm (GST_OBJECT (alsa), alsa->device); if (G_UNLIKELY (!alsa->handle)) { goto no_iec958; } } if (!alsasink_parse_spec (alsa, spec)) goto spec_parse; CHECK (set_hwparams (alsa), hw_params_failed); CHECK (set_swparams (alsa), sw_params_failed); alsa->bpf = GST_AUDIO_INFO_BPF (&spec->info); spec->segsize = alsa->period_size * alsa->bpf; spec->segtotal = alsa->buffer_size / alsa->period_size; { snd_output_t *out_buf = NULL; char *msg = NULL; snd_output_buffer_open (&out_buf); snd_pcm_dump_hw_setup (alsa->handle, out_buf); snd_output_buffer_string (out_buf, &msg); GST_DEBUG_OBJECT (alsa, "Hardware setup: \n%s", msg); snd_output_close (out_buf); snd_output_buffer_open (&out_buf); snd_pcm_dump_sw_setup (alsa->handle, out_buf); snd_output_buffer_string (out_buf, &msg); GST_DEBUG_OBJECT (alsa, "Software setup: \n%s", msg); snd_output_close (out_buf); } #ifdef SND_CHMAP_API_VERSION if (spec->type == GST_AUDIO_RING_BUFFER_FORMAT_TYPE_RAW && alsa->channels < 9) { snd_pcm_chmap_t *chmap = snd_pcm_get_chmap (alsa->handle); if (chmap && chmap->channels == alsa->channels) { GstAudioChannelPosition pos[8]; if (alsa_chmap_to_channel_positions (chmap, pos)) gst_audio_ring_buffer_set_channel_positions (GST_AUDIO_BASE_SINK (alsa)->ringbuffer, pos); } free (chmap); } #endif /* SND_CHMAP_API_VERSION */ return TRUE; /* ERRORS */ no_iec958: { GST_ELEMENT_ERROR (alsa, RESOURCE, OPEN_WRITE, (NULL), ("Could not open IEC958 (SPDIF) device for playback")); return FALSE; } spec_parse: { GST_ELEMENT_ERROR (alsa, RESOURCE, SETTINGS, (NULL), ("Error parsing spec")); return FALSE; } hw_params_failed: { GST_ELEMENT_ERROR (alsa, RESOURCE, SETTINGS, (NULL), ("Setting of hwparams failed: %s", snd_strerror (err))); return FALSE; } sw_params_failed: { GST_ELEMENT_ERROR (alsa, RESOURCE, SETTINGS, (NULL), ("Setting of swparams failed: %s", snd_strerror (err))); return FALSE; } }