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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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f460d7d184
Fix enables float pcm formats for both the alsasrc and alsasink https://bugzilla.gnome.org/show_bug.cgi?id=782695
830 lines
24 KiB
C
830 lines
24 KiB
C
/* Copyright (C) 2006 Tim-Philipp Müller <tim centricular net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "gstalsa.h"
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#include <gst/audio/audio.h>
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static GstCaps *
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gst_alsa_detect_rates (GstObject * obj, snd_pcm_hw_params_t * hw_params,
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GstCaps * in_caps)
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{
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GstCaps *caps;
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guint min, max;
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gint err, dir, min_rate, max_rate, i;
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GST_LOG_OBJECT (obj, "probing sample rates ...");
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if ((err = snd_pcm_hw_params_get_rate_min (hw_params, &min, &dir)) < 0)
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goto min_rate_err;
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if ((err = snd_pcm_hw_params_get_rate_max (hw_params, &max, &dir)) < 0)
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goto max_rate_err;
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min_rate = min;
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max_rate = max;
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if (min_rate < 4000)
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min_rate = 4000; /* random 'sensible minimum' */
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if (max_rate <= 0)
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max_rate = G_MAXINT; /* or maybe just use 192400 or so? */
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else if (max_rate > 0 && max_rate < 4000)
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max_rate = MAX (4000, min_rate);
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GST_DEBUG_OBJECT (obj, "Min. rate = %u (%d)", min_rate, min);
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GST_DEBUG_OBJECT (obj, "Max. rate = %u (%d)", max_rate, max);
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caps = gst_caps_make_writable (in_caps);
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for (i = 0; i < gst_caps_get_size (caps); ++i) {
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GstStructure *s;
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s = gst_caps_get_structure (caps, i);
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if (min_rate == max_rate) {
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gst_structure_set (s, "rate", G_TYPE_INT, min_rate, NULL);
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} else {
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gst_structure_set (s, "rate", GST_TYPE_INT_RANGE,
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min_rate, max_rate, NULL);
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}
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}
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return caps;
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/* ERRORS */
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min_rate_err:
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{
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GST_ERROR_OBJECT (obj, "failed to query minimum sample rate: %s",
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snd_strerror (err));
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gst_caps_unref (in_caps);
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return NULL;
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}
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max_rate_err:
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{
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GST_ERROR_OBJECT (obj, "failed to query maximum sample rate: %s",
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snd_strerror (err));
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gst_caps_unref (in_caps);
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return NULL;
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}
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}
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static snd_pcm_format_t
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gst_alsa_get_pcm_format (GstAudioFormat fmt)
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{
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switch (fmt) {
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case GST_AUDIO_FORMAT_S8:
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return SND_PCM_FORMAT_S8;
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case GST_AUDIO_FORMAT_U8:
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return SND_PCM_FORMAT_U8;
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/* 16 bit */
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case GST_AUDIO_FORMAT_S16LE:
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return SND_PCM_FORMAT_S16_LE;
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case GST_AUDIO_FORMAT_S16BE:
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return SND_PCM_FORMAT_S16_BE;
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case GST_AUDIO_FORMAT_U16LE:
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return SND_PCM_FORMAT_U16_LE;
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case GST_AUDIO_FORMAT_U16BE:
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return SND_PCM_FORMAT_U16_BE;
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/* 24 bit in low 3 bytes of 32 bits */
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case GST_AUDIO_FORMAT_S24_32LE:
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return SND_PCM_FORMAT_S24_LE;
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case GST_AUDIO_FORMAT_S24_32BE:
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return SND_PCM_FORMAT_S24_BE;
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case GST_AUDIO_FORMAT_U24_32LE:
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return SND_PCM_FORMAT_U24_LE;
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case GST_AUDIO_FORMAT_U24_32BE:
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return SND_PCM_FORMAT_U24_BE;
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/* 24 bit in 3 bytes */
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case GST_AUDIO_FORMAT_S24LE:
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return SND_PCM_FORMAT_S24_3LE;
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case GST_AUDIO_FORMAT_S24BE:
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return SND_PCM_FORMAT_S24_3BE;
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case GST_AUDIO_FORMAT_U24LE:
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return SND_PCM_FORMAT_U24_3LE;
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case GST_AUDIO_FORMAT_U24BE:
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return SND_PCM_FORMAT_U24_3BE;
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/* 32 bit */
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case GST_AUDIO_FORMAT_S32LE:
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return SND_PCM_FORMAT_S32_LE;
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case GST_AUDIO_FORMAT_S32BE:
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return SND_PCM_FORMAT_S32_BE;
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case GST_AUDIO_FORMAT_U32LE:
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return SND_PCM_FORMAT_U32_LE;
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case GST_AUDIO_FORMAT_U32BE:
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return SND_PCM_FORMAT_U32_BE;
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case GST_AUDIO_FORMAT_F32LE:
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return SND_PCM_FORMAT_FLOAT_LE;
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case GST_AUDIO_FORMAT_F32BE:
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return SND_PCM_FORMAT_FLOAT_BE;
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case GST_AUDIO_FORMAT_F64LE:
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return SND_PCM_FORMAT_FLOAT64_LE;
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case GST_AUDIO_FORMAT_F64BE:
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return SND_PCM_FORMAT_FLOAT64_BE;
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default:
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break;
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}
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return SND_PCM_FORMAT_UNKNOWN;
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}
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static gboolean
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format_supported (const GValue * format_val, snd_pcm_format_mask_t * mask,
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int endianness)
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{
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const GstAudioFormatInfo *finfo;
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snd_pcm_format_t pcm_format;
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GstAudioFormat format;
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if (!G_VALUE_HOLDS_STRING (format_val))
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return FALSE;
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format = gst_audio_format_from_string (g_value_get_string (format_val));
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if (format == GST_AUDIO_FORMAT_UNKNOWN)
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return FALSE;
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finfo = gst_audio_format_get_info (format);
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if (GST_AUDIO_FORMAT_INFO_ENDIANNESS (finfo) != endianness
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&& GST_AUDIO_FORMAT_INFO_ENDIANNESS (finfo) != 0)
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return FALSE;
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pcm_format = gst_alsa_get_pcm_format (format);
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if (pcm_format == SND_PCM_FORMAT_UNKNOWN)
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return FALSE;
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return snd_pcm_format_mask_test (mask, pcm_format);
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}
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static GstCaps *
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gst_alsa_detect_formats (GstObject * obj, snd_pcm_hw_params_t * hw_params,
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GstCaps * in_caps, int endianness)
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{
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snd_pcm_format_mask_t *mask;
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GstStructure *s;
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GstCaps *caps;
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gint i;
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snd_pcm_format_mask_malloc (&mask);
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snd_pcm_hw_params_get_format_mask (hw_params, mask);
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caps = NULL;
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for (i = 0; i < gst_caps_get_size (in_caps); ++i) {
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const GValue *format;
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GValue list = G_VALUE_INIT;
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s = gst_caps_get_structure (in_caps, i);
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if (!gst_structure_has_name (s, "audio/x-raw")) {
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GST_DEBUG_OBJECT (obj, "skipping non-raw format");
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continue;
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}
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format = gst_structure_get_value (s, "format");
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if (format == NULL)
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continue;
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g_value_init (&list, GST_TYPE_LIST);
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if (GST_VALUE_HOLDS_LIST (format)) {
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gint i, len;
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len = gst_value_list_get_size (format);
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for (i = 0; i < len; i++) {
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const GValue *val;
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val = gst_value_list_get_value (format, i);
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if (format_supported (val, mask, endianness))
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gst_value_list_append_value (&list, val);
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}
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} else if (G_VALUE_HOLDS_STRING (format)) {
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if (format_supported (format, mask, endianness))
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gst_value_list_append_value (&list, format);
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}
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if (gst_value_list_get_size (&list) > 1) {
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if (caps == NULL)
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caps = gst_caps_new_empty ();
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s = gst_structure_copy (s);
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gst_structure_take_value (s, "format", &list);
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gst_caps_append_structure (caps, s);
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} else if (gst_value_list_get_size (&list) == 1) {
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if (caps == NULL)
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caps = gst_caps_new_empty ();
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format = gst_value_list_get_value (&list, 0);
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s = gst_structure_copy (s);
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gst_structure_set_value (s, "format", format);
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gst_caps_append_structure (caps, s);
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g_value_unset (&list);
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} else {
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g_value_unset (&list);
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}
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}
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snd_pcm_format_mask_free (mask);
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gst_caps_unref (in_caps);
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return caps;
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}
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/* we don't have channel mappings for more than this many channels */
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#define GST_ALSA_MAX_CHANNELS 8
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static GstStructure *
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get_channel_free_structure (const GstStructure * in_structure)
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{
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GstStructure *s = gst_structure_copy (in_structure);
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gst_structure_remove_field (s, "channels");
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return s;
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}
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#define ONE_64 G_GUINT64_CONSTANT (1)
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#define CHANNEL_MASK_STEREO ((ONE_64<<GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT) | (ONE_64<<GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT))
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#define CHANNEL_MASK_2_1 (CHANNEL_MASK_STEREO | (ONE_64<<GST_AUDIO_CHANNEL_POSITION_LFE1))
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#define CHANNEL_MASK_4_0 (CHANNEL_MASK_STEREO | (ONE_64<<GST_AUDIO_CHANNEL_POSITION_REAR_LEFT) | (ONE_64<<GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT))
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#define CHANNEL_MASK_5_1 (CHANNEL_MASK_4_0 | (ONE_64<<GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER) | (ONE_64<<GST_AUDIO_CHANNEL_POSITION_LFE1))
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#define CHANNEL_MASK_7_1 (CHANNEL_MASK_5_1 | (ONE_64<<GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT) | (ONE_64<<GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT))
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static GstCaps *
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caps_add_channel_configuration (GstCaps * caps,
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const GstStructure * in_structure, gint min_chans, gint max_chans)
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{
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GstStructure *s = NULL;
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gint c;
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if (min_chans == max_chans && max_chans == 1) {
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s = get_channel_free_structure (in_structure);
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gst_structure_set (s, "channels", G_TYPE_INT, 1, NULL);
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caps = gst_caps_merge_structure (caps, s);
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return caps;
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}
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g_assert (min_chans >= 1);
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/* mono and stereo don't need channel configurations */
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if (min_chans == 2) {
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s = get_channel_free_structure (in_structure);
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gst_structure_set (s, "channels", G_TYPE_INT, 2, "channel-mask",
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GST_TYPE_BITMASK, CHANNEL_MASK_STEREO, NULL);
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caps = gst_caps_merge_structure (caps, s);
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} else if (min_chans == 1 && max_chans >= 2) {
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s = get_channel_free_structure (in_structure);
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gst_structure_set (s, "channels", G_TYPE_INT, 2, "channel-mask",
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GST_TYPE_BITMASK, CHANNEL_MASK_STEREO, NULL);
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caps = gst_caps_merge_structure (caps, s);
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s = get_channel_free_structure (in_structure);
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gst_structure_set (s, "channels", G_TYPE_INT, 1, NULL);
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caps = gst_caps_merge_structure (caps, s);
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}
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/* don't know whether to use 2.1 or 3.0 here - but I suspect
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* alsa might work around that/fix it somehow. Can we tell alsa
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* what our channel layout is like? */
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if (max_chans >= 3 && min_chans <= 3) {
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s = get_channel_free_structure (in_structure);
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gst_structure_set (s, "channels", G_TYPE_INT, 3, "channel-mask",
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GST_TYPE_BITMASK, CHANNEL_MASK_2_1, NULL);
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caps = gst_caps_merge_structure (caps, s);
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}
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/* everything else (4, 6, 8 channels) needs a channel layout */
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for (c = MAX (4, min_chans); c <= 8; c += 2) {
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if (max_chans >= c) {
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guint64 channel_mask;
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s = get_channel_free_structure (in_structure);
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switch (c) {
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case 4:
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channel_mask = CHANNEL_MASK_4_0;
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break;
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case 6:
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channel_mask = CHANNEL_MASK_5_1;
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break;
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case 8:
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channel_mask = CHANNEL_MASK_7_1;
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break;
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default:
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channel_mask = 0;
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g_assert_not_reached ();
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break;
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}
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gst_structure_set (s, "channels", G_TYPE_INT, c, "channel-mask",
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GST_TYPE_BITMASK, channel_mask, NULL);
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caps = gst_caps_merge_structure (caps, s);
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}
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}
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/* NONE layouts for everything else */
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for (c = MAX (9, min_chans); c <= max_chans; ++c) {
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s = get_channel_free_structure (in_structure);
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gst_structure_set (s, "channels", G_TYPE_INT, c, "channel-mask",
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GST_TYPE_BITMASK, G_GUINT64_CONSTANT (0), NULL);
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caps = gst_caps_merge_structure (caps, s);
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}
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return caps;
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}
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static GstCaps *
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gst_alsa_detect_channels (GstObject * obj, snd_pcm_hw_params_t * hw_params,
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GstCaps * in_caps)
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{
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GstCaps *caps;
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guint min, max;
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gint min_chans, max_chans;
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gint err, i;
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GST_LOG_OBJECT (obj, "probing channels ...");
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if ((err = snd_pcm_hw_params_get_channels_min (hw_params, &min)) < 0)
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goto min_chan_error;
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if ((err = snd_pcm_hw_params_get_channels_max (hw_params, &max)) < 0)
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goto max_chan_error;
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/* note: the above functions may return (guint) -1 */
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min_chans = min;
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max_chans = max;
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if (min_chans < 0) {
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min_chans = 1;
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max_chans = GST_ALSA_MAX_CHANNELS;
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} else if (max_chans < 0) {
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max_chans = GST_ALSA_MAX_CHANNELS;
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}
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if (min_chans > max_chans) {
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gint temp;
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GST_WARNING_OBJECT (obj, "minimum channels > maximum channels (%d > %d), "
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"please fix your soundcard drivers", min, max);
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temp = min_chans;
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min_chans = max_chans;
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max_chans = temp;
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}
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/* pro cards seem to return large numbers for min_channels */
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if (min_chans > GST_ALSA_MAX_CHANNELS) {
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GST_DEBUG_OBJECT (obj, "min_chans = %u, looks like a pro card", min_chans);
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if (max_chans < min_chans) {
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max_chans = min_chans;
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} else {
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/* only support [max_chans; max_chans] for these cards for now
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* to avoid inflating the source caps with loads of structures ... */
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min_chans = max_chans;
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}
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} else {
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min_chans = MAX (min_chans, 1);
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max_chans = MIN (GST_ALSA_MAX_CHANNELS, max_chans);
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}
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GST_DEBUG_OBJECT (obj, "Min. channels = %d (%d)", min_chans, min);
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GST_DEBUG_OBJECT (obj, "Max. channels = %d (%d)", max_chans, max);
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caps = gst_caps_new_empty ();
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for (i = 0; i < gst_caps_get_size (in_caps); ++i) {
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GstStructure *s;
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GType field_type;
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gint c_min = min_chans;
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gint c_max = max_chans;
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s = gst_caps_get_structure (in_caps, i);
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/* the template caps might limit the number of channels (like alsasrc),
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* in which case we don't want to return a superset, so hack around this
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* for the two common cases where the channels are either a fixed number
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* or a min/max range). Example: alsasrc template has channels = [1,2] and
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* the detection will claim to support 8 channels for device 'plughw:0' */
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field_type = gst_structure_get_field_type (s, "channels");
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if (field_type == G_TYPE_INT) {
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gst_structure_get_int (s, "channels", &c_min);
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gst_structure_get_int (s, "channels", &c_max);
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} else if (field_type == GST_TYPE_INT_RANGE) {
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const GValue *val;
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val = gst_structure_get_value (s, "channels");
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c_min = CLAMP (gst_value_get_int_range_min (val), min_chans, max_chans);
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c_max = CLAMP (gst_value_get_int_range_max (val), min_chans, max_chans);
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} else {
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c_min = min_chans;
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c_max = max_chans;
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}
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caps = caps_add_channel_configuration (caps, s, c_min, c_max);
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}
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gst_caps_unref (in_caps);
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return caps;
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/* ERRORS */
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min_chan_error:
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{
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GST_ERROR_OBJECT (obj, "failed to query minimum channel count: %s",
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snd_strerror (err));
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return NULL;
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}
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max_chan_error:
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{
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GST_ERROR_OBJECT (obj, "failed to query maximum channel count: %s",
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snd_strerror (err));
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return NULL;
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}
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}
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snd_pcm_t *
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gst_alsa_open_iec958_pcm (GstObject * obj, gchar * device)
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{
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char *iec958_pcm_name = NULL;
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snd_pcm_t *pcm = NULL;
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int res;
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char devstr[256]; /* Storage for local 'default' device string */
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/*
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|
* Try and open our default iec958 device. Fall back to searching on card x
|
|
* if this fails, which should only happen on older alsa setups
|
|
*/
|
|
|
|
/* The string will be one of these:
|
|
* SPDIF_CON: Non-audio flag not set:
|
|
* spdif:{AES0 0x0 AES1 0x82 AES2 0x0 AES3 0x2}
|
|
* SPDIF_CON: Non-audio flag set:
|
|
* spdif:{AES0 0x2 AES1 0x82 AES2 0x0 AES3 0x2}
|
|
*/
|
|
sprintf (devstr,
|
|
"%s:{AES0 0x%02x AES1 0x%02x AES2 0x%02x AES3 0x%02x}",
|
|
device,
|
|
IEC958_AES0_CON_EMPHASIS_NONE | IEC958_AES0_NONAUDIO,
|
|
IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER,
|
|
0, IEC958_AES3_CON_FS_48000);
|
|
|
|
GST_DEBUG_OBJECT (obj, "Generated device string \"%s\"", devstr);
|
|
iec958_pcm_name = devstr;
|
|
|
|
res = snd_pcm_open (&pcm, iec958_pcm_name, SND_PCM_STREAM_PLAYBACK, 0);
|
|
if (G_UNLIKELY (res < 0)) {
|
|
GST_DEBUG_OBJECT (obj, "failed opening IEC958 device: %s",
|
|
snd_strerror (res));
|
|
pcm = NULL;
|
|
}
|
|
|
|
return pcm;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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, 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_alsa_detect_formats (obj, hw_params,
|
|
gst_caps_copy (template_caps), G_BYTE_ORDER);
|
|
|
|
/* if there are no formats in native endianness, try non-native as well */
|
|
if (caps == NULL) {
|
|
GST_INFO_OBJECT (obj, "no formats in native endianness detected");
|
|
|
|
caps = gst_alsa_detect_formats (obj, hw_params,
|
|
gst_caps_copy (template_caps),
|
|
(G_BYTE_ORDER == G_LITTLE_ENDIAN) ? G_BIG_ENDIAN : G_LITTLE_ENDIAN);
|
|
|
|
if (caps == NULL)
|
|
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);
|
|
gst_caps_replace (&caps, NULL);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* returns the card name when the device number is unknown or -1 */
|
|
static gchar *
|
|
gst_alsa_find_device_name_no_handle (GstObject * obj, const gchar * devcard,
|
|
gint device_num, snd_pcm_stream_t stream)
|
|
{
|
|
snd_ctl_card_info_t *info = NULL;
|
|
snd_ctl_t *ctl = NULL;
|
|
gchar *ret = NULL;
|
|
gint dev = -1;
|
|
|
|
GST_LOG_OBJECT (obj, "[%s] device=%d", devcard, device_num);
|
|
|
|
if (snd_ctl_open (&ctl, devcard, 0) < 0)
|
|
return NULL;
|
|
|
|
snd_ctl_card_info_malloc (&info);
|
|
if (snd_ctl_card_info (ctl, info) < 0)
|
|
goto done;
|
|
|
|
if (device_num != -1) {
|
|
while (snd_ctl_pcm_next_device (ctl, &dev) == 0 && dev >= 0) {
|
|
if (dev == device_num) {
|
|
snd_pcm_info_t *pcminfo;
|
|
|
|
snd_pcm_info_malloc (&pcminfo);
|
|
snd_pcm_info_set_device (pcminfo, dev);
|
|
snd_pcm_info_set_subdevice (pcminfo, 0);
|
|
snd_pcm_info_set_stream (pcminfo, stream);
|
|
if (snd_ctl_pcm_info (ctl, pcminfo) < 0) {
|
|
snd_pcm_info_free (pcminfo);
|
|
break;
|
|
}
|
|
|
|
ret = (gchar *) snd_pcm_info_get_name (pcminfo);
|
|
if (ret) {
|
|
ret = g_strdup (ret);
|
|
GST_LOG_OBJECT (obj, "name from pcminfo: %s", ret);
|
|
}
|
|
snd_pcm_info_free (pcminfo);
|
|
if (ret)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ret == NULL) {
|
|
char *name = NULL;
|
|
gint card;
|
|
|
|
GST_LOG_OBJECT (obj, "trying card name");
|
|
card = snd_ctl_card_info_get_card (info);
|
|
snd_card_get_name (card, &name);
|
|
ret = g_strdup (name);
|
|
free (name);
|
|
}
|
|
|
|
done:
|
|
snd_ctl_card_info_free (info);
|
|
snd_ctl_close (ctl);
|
|
|
|
return ret;
|
|
}
|
|
|
|
gchar *
|
|
gst_alsa_find_card_name (GstObject * obj, const gchar * devcard,
|
|
snd_pcm_stream_t stream)
|
|
{
|
|
return gst_alsa_find_device_name_no_handle (obj, devcard, -1, stream);
|
|
}
|
|
|
|
gchar *
|
|
gst_alsa_find_device_name (GstObject * obj, const gchar * device,
|
|
snd_pcm_t * handle, snd_pcm_stream_t stream)
|
|
{
|
|
gchar *ret = NULL;
|
|
|
|
if (device != NULL) {
|
|
gchar *dev, *comma;
|
|
gint devnum;
|
|
|
|
GST_LOG_OBJECT (obj, "Trying to get device name from string '%s'", device);
|
|
|
|
/* only want name:card bit, but not devices and subdevices */
|
|
dev = g_strdup (device);
|
|
if ((comma = strchr (dev, ','))) {
|
|
*comma = '\0';
|
|
devnum = atoi (comma + 1);
|
|
ret = gst_alsa_find_device_name_no_handle (obj, dev, devnum, stream);
|
|
}
|
|
g_free (dev);
|
|
}
|
|
|
|
if (ret == NULL && handle != NULL) {
|
|
snd_pcm_info_t *info;
|
|
|
|
GST_LOG_OBJECT (obj, "Trying to get device name from open handle");
|
|
snd_pcm_info_malloc (&info);
|
|
snd_pcm_info (handle, info);
|
|
ret = g_strdup (snd_pcm_info_get_name (info));
|
|
snd_pcm_info_free (info);
|
|
}
|
|
|
|
GST_LOG_OBJECT (obj, "Device name for device '%s': %s",
|
|
GST_STR_NULL (device), GST_STR_NULL (ret));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* ALSA channel positions */
|
|
const GstAudioChannelPosition alsa_position[][8] = {
|
|
{
|
|
GST_AUDIO_CHANNEL_POSITION_MONO},
|
|
{
|
|
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
|
|
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT},
|
|
{
|
|
GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
|
|
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
|
|
GST_AUDIO_CHANNEL_POSITION_LFE1},
|
|
{
|
|
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_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID},
|
|
{
|
|
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_LFE1},
|
|
{
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID,
|
|
GST_AUDIO_CHANNEL_POSITION_INVALID},
|
|
{
|
|
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_LFE1,
|
|
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
|
|
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT}
|
|
};
|
|
|
|
#ifdef SND_CHMAP_API_VERSION
|
|
/* +1 is to make zero as holes */
|
|
#define ITEM(x, y) \
|
|
[SND_CHMAP_ ## x] = GST_AUDIO_CHANNEL_POSITION_ ## y + 1
|
|
|
|
static const GstAudioChannelPosition gst_pos[SND_CHMAP_LAST + 1] = {
|
|
ITEM (MONO, MONO),
|
|
ITEM (FL, FRONT_LEFT),
|
|
ITEM (FR, FRONT_RIGHT),
|
|
ITEM (FC, FRONT_CENTER),
|
|
ITEM (RL, REAR_LEFT),
|
|
ITEM (RR, REAR_RIGHT),
|
|
ITEM (RC, REAR_CENTER),
|
|
ITEM (LFE, LFE1),
|
|
ITEM (SL, SIDE_LEFT),
|
|
ITEM (SR, SIDE_RIGHT),
|
|
ITEM (FLC, FRONT_LEFT_OF_CENTER),
|
|
ITEM (FRC, FRONT_RIGHT_OF_CENTER),
|
|
ITEM (FLW, WIDE_LEFT),
|
|
ITEM (FRW, WIDE_RIGHT),
|
|
ITEM (TC, TOP_CENTER),
|
|
ITEM (TFL, TOP_FRONT_LEFT),
|
|
ITEM (TFR, TOP_FRONT_RIGHT),
|
|
ITEM (TFC, TOP_FRONT_CENTER),
|
|
ITEM (TRL, TOP_REAR_LEFT),
|
|
ITEM (TRR, TOP_REAR_RIGHT),
|
|
ITEM (TRC, TOP_REAR_CENTER),
|
|
ITEM (LLFE, LFE1),
|
|
ITEM (RLFE, LFE2),
|
|
ITEM (BC, BOTTOM_FRONT_CENTER),
|
|
ITEM (BLC, BOTTOM_FRONT_LEFT),
|
|
ITEM (BRC, BOTTOM_FRONT_LEFT),
|
|
};
|
|
|
|
#undef ITEM
|
|
|
|
gboolean
|
|
alsa_chmap_to_channel_positions (const snd_pcm_chmap_t * chmap,
|
|
GstAudioChannelPosition * pos)
|
|
{
|
|
int c;
|
|
gboolean all_mono = TRUE;
|
|
|
|
for (c = 0; c < chmap->channels; c++) {
|
|
if (chmap->pos[c] > SND_CHMAP_LAST)
|
|
return FALSE;
|
|
pos[c] = gst_pos[chmap->pos[c]];
|
|
if (!pos[c])
|
|
return FALSE;
|
|
pos[c]--;
|
|
|
|
if (pos[c] != GST_AUDIO_CHANNEL_POSITION_MONO)
|
|
all_mono = FALSE;
|
|
}
|
|
|
|
if (all_mono && chmap->channels > 1) {
|
|
/* GST_AUDIO_CHANNEL_POSITION_MONO can only be used with 1 channel and
|
|
* GST_AUDIO_CHANNEL_POSITION_NONE is meant to be used for position-less
|
|
* multi channels.
|
|
* Converting as ALSA can only express such configuration by using an array
|
|
* full of SND_CHMAP_MONO.
|
|
*/
|
|
for (c = 0; c < chmap->channels; c++)
|
|
pos[c] = GST_AUDIO_CHANNEL_POSITION_NONE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
void
|
|
alsa_detect_channels_mapping (GstObject * obj, snd_pcm_t * handle,
|
|
GstAudioRingBufferSpec * spec, guint channels, GstAudioRingBuffer * buf)
|
|
{
|
|
snd_pcm_chmap_t *chmap;
|
|
GstAudioChannelPosition pos[8];
|
|
|
|
if (spec->type != GST_AUDIO_RING_BUFFER_FORMAT_TYPE_RAW || channels >= 9)
|
|
return;
|
|
|
|
chmap = snd_pcm_get_chmap (handle);
|
|
if (!chmap) {
|
|
GST_LOG_OBJECT (obj, "ALSA driver does not implement channels mapping API");
|
|
return;
|
|
}
|
|
|
|
if (chmap->channels != channels) {
|
|
GST_LOG_OBJECT (obj,
|
|
"got channels mapping for %u channels but stream has %u channels; ignoring",
|
|
chmap->channels, channels);
|
|
goto out;
|
|
}
|
|
|
|
if (alsa_chmap_to_channel_positions (chmap, pos)) {
|
|
#ifndef GST_DISABLE_GST_DEBUG
|
|
{
|
|
gchar *tmp = gst_audio_channel_positions_to_string (pos, channels);
|
|
|
|
GST_LOG_OBJECT (obj, "got channels mapping %s", tmp);
|
|
g_free (tmp);
|
|
}
|
|
#endif /* GST_DISABLE_GST_DEBUG */
|
|
|
|
gst_audio_ring_buffer_set_channel_positions (buf, pos);
|
|
} else {
|
|
GST_LOG_OBJECT (obj, "failed to convert ALSA channels mapping");
|
|
}
|
|
|
|
out:
|
|
free (chmap);
|
|
}
|
|
#endif /* SND_CHMAP_API_VERSION */
|