+2006-05-16 Tim-Philipp Müller <tim at centricular dot net>
+
+ * ext/alsa/Makefile.am:
+ * ext/alsa/gstalsa.c: (gst_alsa_detect_rates),
+ (gst_alsa_detect_formats), (get_channel_free_structure),
+ (caps_add_channel_configuration), (gst_alsa_detect_channels),
+ (gst_alsa_probe_supported_formats):
+ * ext/alsa/gstalsa.h:
+ * ext/alsa/gstalsasink.c: (gst_alsasink_getcaps):
+ Refactor and improve caps probing code: probe signedness
+ when we probe the supported formats/widths; set endianness
+ to the one we actually probed for (ie. cpu endianness).
+
+ * ext/alsa/gstalsasrc.c: (gst_alsasrc_init), (gst_alsasrc_getcaps),
+ (gst_alsasrc_close):
+ * ext/alsa/gstalsasrc.h:
+ Implement caps probing for alsasrc.
+
2006-05-15 Wim Taymans <wim@fluendo.com>
* ext/theora/theoradec.c: (gst_theora_dec_reset),
gstalsamixeroptions.c \
gstalsaplugin.c \
gstalsasink.c \
- gstalsasrc.c
+ gstalsasrc.c \
+ gstalsa.c
libgstalsa_la_CFLAGS = $(GST_CFLAGS) $(ALSA_CFLAGS)
libgstalsa_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
--- /dev/null
+/* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "gstalsa.h"
+
+#include <gst/audio/multichannel.h>
+
+static GstCaps *
+gst_alsa_detect_rates (GstObject * obj, snd_pcm_hw_params_t * hw_params,
+ GstCaps * in_caps)
+{
+ GstCaps *caps;
+ guint min, max;
+ gint err, dir, min_rate, max_rate, i;
+
+ GST_LOG_OBJECT (obj, "probing sample rates ...");
+
+ if ((err = snd_pcm_hw_params_get_rate_min (hw_params, &min, &dir)) < 0)
+ goto min_rate_err;
+
+ if ((err = snd_pcm_hw_params_get_rate_max (hw_params, &max, &dir)) < 0)
+ goto max_rate_err;
+
+ min_rate = min;
+ max_rate = max;
+
+ if (min_rate < 4000)
+ min_rate = 4000; /* random 'sensible minimum' */
+
+ if (max_rate <= 0)
+ max_rate = G_MAXINT; /* or maybe just use 192400 or so? */
+ else if (max_rate > 0 && max_rate < 4000)
+ max_rate = MAX (4000, min_rate);
+
+ GST_DEBUG_OBJECT (obj, "Min. rate = %u (%d)", min_rate, min);
+ GST_DEBUG_OBJECT (obj, "Max. rate = %u (%d)", max_rate, max);
+
+ caps = gst_caps_make_writable (in_caps);
+
+ for (i = 0; i < gst_caps_get_size (caps); ++i) {
+ GstStructure *s;
+
+ s = gst_caps_get_structure (caps, i);
+ if (min_rate == max_rate) {
+ gst_structure_set (s, "rate", G_TYPE_INT, min_rate, NULL);
+ } else {
+ gst_structure_set (s, "rate", GST_TYPE_INT_RANGE,
+ min_rate, max_rate, NULL);
+ }
+ }
+
+ return caps;
+
+min_rate_err:
+ {
+ GST_ERROR_OBJECT (obj, "failed to query minimum sample rate: %s",
+ snd_strerror (err));
+ gst_caps_unref (in_caps);
+ return NULL;
+ }
+max_rate_err:
+ {
+ GST_ERROR_OBJECT (obj, "failed to query maximum sample rate: %s",
+ snd_strerror (err));
+ gst_caps_unref (in_caps);
+ return NULL;
+ }
+}
+
+static const struct
+{
+ const int sformat;
+ const int uformat;
+} pcmformats[4] = {
+ {
+ SND_PCM_FORMAT_S8, SND_PCM_FORMAT_U8}, {
+ SND_PCM_FORMAT_S16, SND_PCM_FORMAT_U16}, {
+ SND_PCM_FORMAT_UNKNOWN, SND_PCM_FORMAT_UNKNOWN}, {
+ SND_PCM_FORMAT_S32, SND_PCM_FORMAT_U32}
+};
+
+static GstCaps *
+gst_alsa_detect_formats (GstObject * obj, snd_pcm_hw_params_t * hw_params,
+ GstCaps * in_caps)
+{
+ snd_pcm_format_mask_t *mask;
+ GstStructure *s;
+ GstCaps *caps;
+ gint i;
+
+ snd_pcm_format_mask_alloca (&mask);
+ snd_pcm_hw_params_get_format_mask (hw_params, mask);
+
+ caps = gst_caps_new_empty ();
+
+ for (i = 0; i < gst_caps_get_size (in_caps); ++i) {
+ GstStructure *scopy;
+ gint w, width = 0;
+
+ s = gst_caps_get_structure (in_caps, i);
+ if (!gst_structure_has_name (s, "audio/x-raw-int")) {
+ GST_WARNING_OBJECT (obj, "skipping non-int format");
+ continue;
+ }
+ gst_structure_get_int (s, "width", &width);
+ g_assert (width != 0 && (width % 8) == 0);
+ w = (width / 8) - 1;
+ if (snd_pcm_format_mask_test (mask, pcmformats[w].sformat) &&
+ snd_pcm_format_mask_test (mask, pcmformats[w].uformat)) {
+ /* template contains { true, false } or just one, leave it as it is */
+ scopy = gst_structure_copy (s);
+ } else if (snd_pcm_format_mask_test (mask, pcmformats[w].sformat)) {
+ scopy = gst_structure_copy (s);
+ gst_structure_set (scopy, "signed", G_TYPE_BOOLEAN, TRUE, NULL);
+ } else if (snd_pcm_format_mask_test (mask, pcmformats[w].uformat)) {
+ scopy = gst_structure_copy (s);
+ gst_structure_set (scopy, "signed", G_TYPE_BOOLEAN, FALSE, NULL);
+ } else {
+ scopy = NULL;
+ }
+ if (scopy) {
+ if (width > 8) {
+ /* TODO: proper endianness detection, for now it's CPU endianness only */
+ gst_structure_set (scopy, "endianness", G_TYPE_INT, G_BYTE_ORDER, NULL);
+ }
+ gst_caps_append_structure (caps, scopy);
+ }
+ }
+
+ gst_caps_unref (in_caps);
+ return caps;
+}
+
+/* we don't have channel mappings for more than this many channels */
+#define GST_ALSA_MAX_CHANNELS 8
+
+static GstStructure *
+get_channel_free_structure (const GstStructure * in_structure)
+{
+ GstStructure *s = gst_structure_copy (in_structure);
+
+ gst_structure_remove_field (s, "channels");
+ return s;
+}
+
+static void
+caps_add_channel_configuration (GstCaps * caps,
+ const GstStructure * in_structure, gint min_chans, gint max_chans)
+{
+ GstAudioChannelPosition pos[8] = {
+ GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+ GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+ GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
+ GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
+ GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
+ GST_AUDIO_CHANNEL_POSITION_LFE,
+ GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
+ GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT
+ };
+ GstStructure *s = NULL;
+ gint c;
+
+ if (min_chans == max_chans) {
+ s = get_channel_free_structure (in_structure);
+ gst_structure_set (s, "channels", G_TYPE_INT, max_chans, NULL);
+ gst_caps_append_structure (caps, s);
+ return;
+ }
+
+ g_assert (min_chans >= 1);
+
+ /* mono and stereo don't need channel configurations */
+ if (min_chans == 2) {
+ s = get_channel_free_structure (in_structure);
+ gst_structure_set (s, "channels", G_TYPE_INT, 2, NULL);
+ gst_caps_append_structure (caps, s);
+ } else if (min_chans == 1 && max_chans >= 2) {
+ s = get_channel_free_structure (in_structure);
+ gst_structure_set (s, "channels", GST_TYPE_INT_RANGE, 1, 2, NULL);
+ gst_caps_append_structure (caps, s);
+ }
+
+ /* don't know whether to use 2.1 or 3.0 here - but I suspect
+ * alsa might work around that/fix it somehow. Can we tell alsa
+ * what our channel layout is like? */
+ if (max_chans >= 3) {
+ GstAudioChannelPosition pos_21[3] = {
+ GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
+ GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
+ GST_AUDIO_CHANNEL_POSITION_LFE
+ };
+
+ s = get_channel_free_structure (in_structure);
+ gst_structure_set (s, "channels", G_TYPE_INT, 3, NULL);
+ gst_audio_set_channel_positions (s, pos_21);
+ gst_caps_append_structure (caps, s);
+ }
+
+ /* everything else (4, 6, 8 channels) needs a channel layout */
+ for (c = 4; c < 8; c += 2) {
+ if (max_chans >= c) {
+ s = get_channel_free_structure (in_structure);
+ gst_structure_set (s, "channels", G_TYPE_INT, c, NULL);
+ gst_audio_set_channel_positions (s, pos);
+ gst_caps_append_structure (caps, s);
+ }
+ }
+}
+
+static GstCaps *
+gst_alsa_detect_channels (GstObject * obj, snd_pcm_hw_params_t * hw_params,
+ GstCaps * in_caps)
+{
+ GstCaps *caps;
+ guint min, max;
+ gint min_chans, max_chans;
+ gint err, i;
+
+ GST_LOG_OBJECT (obj, "probing channels ...");
+
+ if ((err = snd_pcm_hw_params_get_channels_min (hw_params, &min)) < 0)
+ goto min_chan_error;
+
+ if ((err = snd_pcm_hw_params_get_channels_max (hw_params, &max)) < 0)
+ goto max_chan_error;
+
+ /* note: the above functions may return (guint) -1 */
+ min_chans = min;
+ max_chans = max;
+
+ if (min_chans < 0) {
+ min_chans = 1;
+ max_chans = GST_ALSA_MAX_CHANNELS;
+ } else if (max_chans < 0) {
+ max_chans = GST_ALSA_MAX_CHANNELS;
+ }
+
+ if (min_chans > max_chans) {
+ gint temp;
+
+ GST_WARNING_OBJECT (obj, "minimum channels > maximum channels (%d > %d), "
+ "please fix your soundcard drivers", min, max);
+ temp = min_chans;
+ min_chans = max_chans;
+ max_chans = temp;
+ }
+
+ min_chans = MAX (min_chans, 1);
+ max_chans = MIN (GST_ALSA_MAX_CHANNELS, max_chans);
+
+ GST_DEBUG_OBJECT (obj, "Min. channels = %d (%d)", min_chans, min);
+ GST_DEBUG_OBJECT (obj, "Max. channels = %d (%d)", max_chans, max);
+
+ caps = gst_caps_new_empty ();
+
+ for (i = 0; i < gst_caps_get_size (in_caps); ++i) {
+ GstStructure *s;
+ GType field_type;
+ gint c_min = min_chans;
+ gint c_max = max_chans;
+
+ s = gst_caps_get_structure (in_caps, i);
+ /* the template caps might limit the number of channels (like alsasrc),
+ * in which case we don't want to return a superset, so hack around this
+ * for the two common cases where the channels are either a fixed number
+ * or a min/max range). Example: alsasrc template has channels = [1,2] and
+ * the detection will claim to support 8 channels for device 'plughw:0' */
+ field_type = gst_structure_get_field_type (s, "channels");
+ if (field_type == G_TYPE_INT) {
+ gst_structure_get_int (s, "channels", &c_min);
+ gst_structure_get_int (s, "channels", &c_max);
+ } else if (field_type == GST_TYPE_INT_RANGE) {
+ const GValue *val;
+
+ val = gst_structure_get_value (s, "channels");
+ c_min = CLAMP (gst_value_get_int_range_min (val), min_chans, max_chans);
+ c_max = CLAMP (gst_value_get_int_range_max (val), min_chans, max_chans);
+ } else {
+ c_min = min_chans;
+ c_max = max_chans;
+ }
+
+ caps_add_channel_configuration (caps, s, c_min, c_max);
+ }
+
+ gst_caps_unref (in_caps);
+
+ return caps;
+
+min_chan_error:
+ {
+ GST_ERROR_OBJECT (obj, "failed to query minimum channel count: %s",
+ snd_strerror (err));
+ return NULL;
+ }
+max_chan_error:
+ {
+ GST_ERROR_OBJECT (obj, "failed to query maximum channel count: %s",
+ snd_strerror (err));
+ return NULL;
+ }
+}
+
+/*
+ * gst_alsa_probe_supported_formats:
+ *
+ * Takes the template caps and returns the subset which is actually
+ * supported by this device.
+ *
+ */
+
+GstCaps *
+gst_alsa_probe_supported_formats (GstObject * obj, snd_pcm_t * handle,
+ const GstCaps * template_caps)
+{
+ snd_pcm_hw_params_t *hw_params;
+ GstCaps *caps;
+ gint err;
+
+ snd_pcm_hw_params_alloca (&hw_params);
+ if ((err = snd_pcm_hw_params_any (handle, hw_params)) < 0)
+ goto error;
+
+ 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;
+
+ return caps;
+
+error:
+ {
+ GST_ERROR_OBJECT (obj, "failed to query formats: %s", snd_strerror (err));
+ return NULL;
+ }
+
+subroutine_error:
+ {
+ GST_ERROR_OBJECT (obj, "failed to query formats");
+ return NULL;
+ }
+}
GST_DEBUG_CATEGORY_EXTERN (alsa_debug);
#define GST_CAT_DEFAULT alsa_debug
+GstCaps * gst_alsa_probe_supported_formats (GstObject * obj,
+ snd_pcm_t * handle,
+ const GstCaps * template_caps);
+
#endif /* __GST_ALSA_H__ */
#include "gstalsasink.h"
#include <gst/gst-i18n-plugin.h>
-#include <gst/audio/multichannel.h>
/* elementfactory information */
static const GstElementDetails gst_alsasink_details =
goto error; \
} G_STMT_END;
-/* we don't have channel mappings for more than this many channels */
-#define GST_ALSA_MAX_CHANNELS 8
-
-static GstStructure *
-get_channel_free_structure (const GstStructure * in_structure)
-{
- GstStructure *s = gst_structure_copy (in_structure);
-
- gst_structure_remove_field (s, "channels");
- return s;
-}
-
-static void
-caps_add_channel_configuration (GstCaps * caps,
- const GstStructure * in_structure, gint min_channels, gint max_channels)
-{
- GstAudioChannelPosition pos[8] = {
- GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
- GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
- GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
- GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
- GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
- GST_AUDIO_CHANNEL_POSITION_LFE,
- GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
- GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT
- };
- GstStructure *s = NULL;
- gint c;
-
- if (min_channels == max_channels) {
- s = get_channel_free_structure (in_structure);
- gst_structure_set (s, "channels", G_TYPE_INT, max_channels, NULL);
- gst_caps_append_structure (caps, s);
- return;
- }
-
- g_assert (min_channels >= 1);
-
- /* mono and stereo don't need channel configurations */
- if (min_channels == 2) {
- s = get_channel_free_structure (in_structure);
- gst_structure_set (s, "channels", G_TYPE_INT, 2, NULL);
- gst_caps_append_structure (caps, s);
- } else if (min_channels == 1 && max_channels >= 2) {
- s = get_channel_free_structure (in_structure);
- gst_structure_set (s, "channels", GST_TYPE_INT_RANGE, 1, 2, NULL);
- gst_caps_append_structure (caps, s);
- }
-
- /* don't know whether to use 2.1 or 3.0 here - but I suspect
- * alsa might work around that/fix it somehow. Can we tell alsa
- * what our channel layout is like? */
- if (max_channels >= 3) {
- GstAudioChannelPosition pos_21[3] = {
- GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
- GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
- GST_AUDIO_CHANNEL_POSITION_LFE
- };
-
- s = get_channel_free_structure (in_structure);
- gst_structure_set (s, "channels", G_TYPE_INT, 3, NULL);
- gst_audio_set_channel_positions (s, pos_21);
- gst_caps_append_structure (caps, s);
- }
-
- /* everything else (4, 6, 8 channels) needs a channel layout */
- for (c = 4; c < 8; c += 2) {
- if (max_channels >= c) {
- s = get_channel_free_structure (in_structure);
- gst_structure_set (s, "channels", G_TYPE_INT, c, NULL);
- gst_audio_set_channel_positions (s, pos);
- gst_caps_append_structure (caps, s);
- }
- }
-}
-
static GstCaps *
gst_alsasink_getcaps (GstBaseSink * bsink)
{
- snd_pcm_format_mask_t *mask;
- snd_pcm_hw_params_t *hw_params;
GstElementClass *element_class;
GstPadTemplate *pad_template;
GstAlsaSink *sink = GST_ALSA_SINK (bsink);
- GstCaps *tmpl_caps;
- GstCaps *caps = NULL;
- GstStructure *s;
- guint min, max;
- gint i, err, width, dir;
- gint min_channels, max_channels;
- gint min_rate, max_rate;
- guint bits = 0;
- static const int audio_fmts[] = {
- SND_PCM_FORMAT_U8, SND_PCM_FORMAT_S8,
- SND_PCM_FORMAT_S16, SND_PCM_FORMAT_U16,
- /*SND_PCM_FORMAT_S24, SND_PCM_FORMAT_U24, */
- SND_PCM_FORMAT_S32, SND_PCM_FORMAT_U32
- };
- static const guint audio_bits[] = {
- 8, 8, 16, 16, 32, 32
- };
+ GstCaps *caps;
if (sink->handle == NULL) {
GST_DEBUG_OBJECT (sink, "device not open, using template caps");
}
if (sink->cached_caps) {
- GST_DEBUG_OBJECT (sink, "Returning cached caps %" GST_PTR_FORMAT,
- sink->cached_caps);
+ GST_LOG_OBJECT (sink, "Returning cached caps");
return gst_caps_ref (sink->cached_caps);
}
- snd_pcm_hw_params_alloca (&hw_params);
- CHECK (snd_pcm_hw_params_any (sink->handle, hw_params), error);
-
- /* === probe supported channels === */
- GST_LOG_OBJECT (sink, "probing channels ...");
- CHECK (snd_pcm_hw_params_get_channels_min (hw_params, &min), min_chan_error);
- CHECK (snd_pcm_hw_params_get_channels_max (hw_params, &max), max_chan_error);
-
- min_channels = min;
- max_channels = max;
-
- if (min_channels < 0) { /* hmm? min and max are unsigned */
- min_channels = 1;
- max_channels = GST_ALSA_MAX_CHANNELS;
- } else if (max_channels < 0) { /* hmm? min and max are unsigned */
- max_channels = GST_ALSA_MAX_CHANNELS;
- }
-
- if (min_channels > max_channels) {
- gint temp;
-
- GST_WARNING_OBJECT (sink, "minimum channels > maximum channels (%d > %d), "
- "please fix your soundcard drivers", min, max);
- temp = min_channels;
- min_channels = max_channels;
- max_channels = temp;
- }
-
- min_channels = MAX (min_channels, 1);
- max_channels = MIN (GST_ALSA_MAX_CHANNELS, max_channels);
-
- GST_LOG_OBJECT (sink, "Min. channels = %d (%d)", min_channels, min);
- GST_LOG_OBJECT (sink, "Max. channels = %d (%d)", max_channels, max);
-
- /* === probe supported sample rates === */
- GST_LOG_OBJECT (sink, "probing sample rates ...");
- CHECK (snd_pcm_hw_params_get_rate_min (hw_params, &min, &dir), min_rate_err);
- CHECK (snd_pcm_hw_params_get_rate_max (hw_params, &max, &dir), max_rate_err);
-
- min_rate = min;
- max_rate = max;
-
- if (min_rate < 4000)
- min_rate = 4000; /* random 'sensible minimum' */
-
- if (max_rate <= 0)
- max_rate = G_MAXINT; /* or maybe just use 192400 or so? */
- else if (max_rate > 0 && max_rate < 4000)
- max_rate = MAX (4000, min_rate);
-
- GST_LOG_OBJECT (sink, "Min. rate = %d (%d)", min_rate, min);
- GST_LOG_OBJECT (sink, "Max. rate = %d (%d)", max_rate, max);
-
- /* === probe supported sample widths === */
- snd_pcm_format_mask_alloca (&mask);
- snd_pcm_hw_params_get_format_mask (hw_params, mask);
- g_assert (G_N_ELEMENTS (audio_fmts) == G_N_ELEMENTS (audio_bits));
- for (i = 0; i < G_N_ELEMENTS (audio_fmts); i++) {
- if (snd_pcm_format_mask_test (mask, audio_fmts[i])) {
- bits |= audio_bits[i];
- }
- }
- GST_LOG_OBJECT (sink, "Bits = 0x%08x", bits);
-
- /* fill caps according to capabilities gathered above */
element_class = GST_ELEMENT_GET_CLASS (sink);
pad_template = gst_element_class_get_pad_template (element_class, "sink");
-
g_return_val_if_fail (pad_template != NULL, NULL);
- tmpl_caps = gst_pad_template_get_caps (pad_template);
-
- caps = gst_caps_new_empty ();
+ caps = gst_alsa_probe_supported_formats (GST_OBJECT (sink), sink->handle,
+ gst_pad_template_get_caps (pad_template));
- for (i = 0; i < gst_caps_get_size (tmpl_caps); ++i) {
- s = gst_caps_get_structure (tmpl_caps, i);
- gst_structure_get_int (s, "width", &width);
- /* TODO: filter signed/unsigned */
- if (bits & width) {
- caps_add_channel_configuration (caps, s, min_channels, max_channels);
- } else {
- GST_LOG_OBJECT (sink, "width = %d unsupported", width);
- }
+ if (caps) {
+ sink->cached_caps = gst_caps_ref (caps);
}
- for (i = 0; i < gst_caps_get_size (caps); ++i) {
- s = gst_caps_get_structure (caps, i);
- if (min_rate == max_rate) {
- gst_structure_set (s, "rate", G_TYPE_INT, min_rate, NULL);
- } else {
- gst_structure_set (s, "rate", GST_TYPE_INT_RANGE,
- min_rate, max_rate, NULL);
- }
- }
-
- sink->cached_caps = gst_caps_ref (caps);
-
- GST_DEBUG_OBJECT (sink, "returning caps %" GST_PTR_FORMAT, caps);
+ GST_INFO_OBJECT (sink, "returning caps %" GST_PTR_FORMAT, caps);
return caps;
-
-error:
- {
- GST_ERROR_OBJECT (sink, "failed to query alsasink formats: %s",
- snd_strerror (err));
- return NULL;
- }
-min_chan_error:
- {
- GST_ERROR_OBJECT (sink, "failed to query minimum channel count: %s",
- snd_strerror (err));
- return NULL;
- }
-max_chan_error:
- {
- GST_ERROR_OBJECT (sink, "failed to query maximum channel count: %s",
- snd_strerror (err));
- return NULL;
- }
-min_rate_err:
- {
- GST_ERROR_OBJECT (sink, "failed to query minimum sample rate: %s",
- snd_strerror (err));
- return NULL;
- }
-max_rate_err:
- {
- GST_ERROR_OBJECT (sink, "failed to query maximum sample rate: %s",
- snd_strerror (err));
- return NULL;
- }
}
static int
snd_pcm_hw_params_alloca (¶ms);
- GST_DEBUG_OBJECT (alsa, "Negotiating to %d channels @ %d Hz (format = %d)",
- alsa->channels, alsa->rate, alsa->format);
+ GST_DEBUG_OBJECT (alsa, "Negotiating to %d channels @ %d Hz (format = %s)",
+ alsa->channels, alsa->rate, snd_pcm_format_name (alsa->format));
/* choose all parameters */
CHECK (snd_pcm_hw_params_any (alsa->handle, params), no_config);
GST_DEBUG_OBJECT (alsasrc, "initializing");
alsasrc->device = g_strdup (DEFAULT_PROP_DEVICE);
-}
-
-static GstCaps *
-gst_alsasrc_getcaps (GstBaseSrc * bsrc)
-{
- return NULL;
+ alsasrc->cached_caps = NULL;
}
#define CHECK(call, error) \
goto error; \
} G_STMT_END;
+
+static GstCaps *
+gst_alsasrc_getcaps (GstBaseSrc * bsrc)
+{
+ GstElementClass *element_class;
+ GstPadTemplate *pad_template;
+ GstAlsaSrc *src;
+ GstCaps *caps;
+
+ src = GST_ALSA_SRC (bsrc);
+
+ if (src->handle == NULL) {
+ GST_DEBUG_OBJECT (src, "device not open, using template caps");
+ return NULL; /* base class will get template caps for us */
+ }
+
+ if (src->cached_caps) {
+ GST_LOG_OBJECT (src, "Returning cached caps");
+ return gst_caps_ref (src->cached_caps);
+ }
+
+ element_class = GST_ELEMENT_GET_CLASS (src);
+ pad_template = gst_element_class_get_pad_template (element_class, "src");
+ g_return_val_if_fail (pad_template != NULL, NULL);
+
+ caps = gst_alsa_probe_supported_formats (GST_OBJECT (src), src->handle,
+ gst_pad_template_get_caps (pad_template));
+
+ if (caps) {
+ src->cached_caps = gst_caps_ref (caps);
+ }
+
+ GST_INFO_OBJECT (src, "returning caps %" GST_PTR_FORMAT, caps);
+
+ return caps;
+}
+
static int
set_hwparams (GstAlsaSrc * alsa)
{
alsa->mixer = NULL;
}
+ gst_caps_replace (&alsa->cached_caps, NULL);
+
return TRUE;
}
G_BEGIN_DECLS
-#define GST_TYPE_ALSA_SRC (gst_alsasrc_get_type())
-#define GST_ALSA_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALSA_SRC,GstAlsaSrc))
-#define GST_ALSA_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALSA_SRC,GstAlsaSrcClass))
-#define GST_IS_ALSA_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALSA_SRC))
-#define GST_IS_ALSA_SRC_CLASS(obj) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALSA_SRC))
+#define GST_TYPE_ALSA_SRC (gst_alsasrc_get_type())
+#define GST_ALSA_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALSA_SRC,GstAlsaSrc))
+#define GST_ALSA_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALSA_SRC,GstAlsaSrcClass))
+#define GST_IS_ALSA_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALSA_SRC))
+#define GST_IS_ALSA_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALSA_SRC))
typedef struct _GstAlsaSrc GstAlsaSrc;
typedef struct _GstAlsaSrcClass GstAlsaSrcClass;
snd_pcm_hw_params_t *hwparams;
snd_pcm_sw_params_t *swparams;
+ GstCaps *cached_caps;
+
snd_pcm_access_t access;
snd_pcm_format_t format;
guint rate;
projects / platform / upstream / gst-plugins-base.git / commitdiff