Renaming generic-sounding filenames to indicate "audio".
Change-Id: Iba6403a3493379c39d22d23b438f028efc2e15b7
diff --git a/modules/usbaudio/audio_format.c b/modules/usbaudio/audio_format.c
new file mode 100644
index 0000000..63b1ba8
--- /dev/null
+++ b/modules/usbaudio/audio_format.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "audio_format"
+/*#define LOG_NDEBUG 0*/
+
+#include "audio_format.h"
+
+#include <tinyalsa/asoundlib.h>
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
+
+/*
+ * Maps from bit position in pcm_mask to PCM_ format constants.
+ */
+int8_t const pcm_format_value_map[50] = {
+ PCM_FORMAT_S8, /* 00 - SNDRV_PCM_FORMAT_S8 */
+ PCM_FORMAT_INVALID, /* 01 - SNDRV_PCM_FORMAT_U8 */
+ PCM_FORMAT_S16_LE, /* 02 - SNDRV_PCM_FORMAT_S16_LE */
+ PCM_FORMAT_INVALID, /* 03 - SNDRV_PCM_FORMAT_S16_BE */
+ PCM_FORMAT_INVALID, /* 04 - SNDRV_PCM_FORMAT_U16_LE */
+ PCM_FORMAT_INVALID, /* 05 - SNDRV_PCM_FORMAT_U16_BE */
+ PCM_FORMAT_S24_3LE, /* 06 - SNDRV_PCM_FORMAT_S24_LE */
+ PCM_FORMAT_INVALID, /* 07 - SNDRV_PCM_FORMAT_S24_BE */
+ PCM_FORMAT_INVALID, /* 08 - SNDRV_PCM_FORMAT_U24_LE */
+ PCM_FORMAT_INVALID, /* 09 - SNDRV_PCM_FORMAT_U24_BE */
+ PCM_FORMAT_S32_LE, /* 10 - SNDRV_PCM_FORMAT_S32_LE */
+ PCM_FORMAT_INVALID, /* 11 - SNDRV_PCM_FORMAT_S32_BE */
+ PCM_FORMAT_INVALID, /* 12 - SNDRV_PCM_FORMAT_U32_LE */
+ PCM_FORMAT_INVALID, /* 13 - SNDRV_PCM_FORMAT_U32_BE */
+ PCM_FORMAT_INVALID, /* 14 - SNDRV_PCM_FORMAT_FLOAT_LE */
+ PCM_FORMAT_INVALID, /* 15 - SNDRV_PCM_FORMAT_FLOAT_BE */
+ PCM_FORMAT_INVALID, /* 16 - SNDRV_PCM_FORMAT_FLOAT64_LE */
+ PCM_FORMAT_INVALID, /* 17 - SNDRV_PCM_FORMAT_FLOAT64_BE */
+ PCM_FORMAT_INVALID, /* 18 - SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE */
+ PCM_FORMAT_INVALID, /* 19 - SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE */
+ PCM_FORMAT_INVALID, /* 20 - SNDRV_PCM_FORMAT_MU_LAW */
+ PCM_FORMAT_INVALID, /* 21 - SNDRV_PCM_FORMAT_A_LAW */
+ PCM_FORMAT_INVALID, /* 22 - SNDRV_PCM_FORMAT_IMA_ADPCM */
+ PCM_FORMAT_INVALID, /* 23 - SNDRV_PCM_FORMAT_MPEG */
+ PCM_FORMAT_INVALID, /* 24 - SNDRV_PCM_FORMAT_GSM */
+ PCM_FORMAT_INVALID, /* 25 -> 30 (not assigned) */
+ PCM_FORMAT_INVALID,
+ PCM_FORMAT_INVALID,
+ PCM_FORMAT_INVALID,
+ PCM_FORMAT_INVALID,
+ PCM_FORMAT_INVALID,
+ PCM_FORMAT_INVALID, /* 31 - SNDRV_PCM_FORMAT_SPECIAL */
+ PCM_FORMAT_S24_3LE, /* 32 - SNDRV_PCM_FORMAT_S24_3LE */ /* ??? */
+ PCM_FORMAT_INVALID, /* 33 - SNDRV_PCM_FORMAT_S24_3BE */
+ PCM_FORMAT_INVALID, /* 34 - SNDRV_PCM_FORMAT_U24_3LE */
+ PCM_FORMAT_INVALID, /* 35 - SNDRV_PCM_FORMAT_U24_3BE */
+ PCM_FORMAT_INVALID, /* 36 - SNDRV_PCM_FORMAT_S20_3LE */
+ PCM_FORMAT_INVALID, /* 37 - SNDRV_PCM_FORMAT_S20_3BE */
+ PCM_FORMAT_INVALID, /* 38 - SNDRV_PCM_FORMAT_U20_3LE */
+ PCM_FORMAT_INVALID, /* 39 - SNDRV_PCM_FORMAT_U20_3BE */
+ PCM_FORMAT_INVALID, /* 40 - SNDRV_PCM_FORMAT_S18_3LE */
+ PCM_FORMAT_INVALID, /* 41 - SNDRV_PCM_FORMAT_S18_3BE */
+ PCM_FORMAT_INVALID, /* 42 - SNDRV_PCM_FORMAT_U18_3LE */
+ PCM_FORMAT_INVALID, /* 43 - SNDRV_PCM_FORMAT_U18_3BE */
+ PCM_FORMAT_INVALID, /* 44 - SNDRV_PCM_FORMAT_G723_24 */
+ PCM_FORMAT_INVALID, /* 45 - SNDRV_PCM_FORMAT_G723_24_1B */
+ PCM_FORMAT_INVALID, /* 46 - SNDRV_PCM_FORMAT_G723_40 */
+ PCM_FORMAT_INVALID, /* 47 - SNDRV_PCM_FORMAT_G723_40_1B */
+ PCM_FORMAT_INVALID, /* 48 - SNDRV_PCM_FORMAT_DSD_U8 */
+ PCM_FORMAT_INVALID /* 49 - SNDRV_PCM_FORMAT_DSD_U16_LE */
+};
+
+/*
+ * Scans the provided format mask and returns the first non-8 bit sample
+ * format supported by the devices.
+ */
+enum pcm_format get_pcm_format_for_mask(struct pcm_mask* mask)
+{
+ int num_slots = ARRAY_SIZE(mask->bits);
+ int bits_per_slot = sizeof(mask->bits[0]) * 8;
+
+ int table_size = ARRAY_SIZE(pcm_format_value_map);
+
+ int slot_index, bit_index, table_index;
+ table_index = 0;
+ int num_written = 0;
+ for (slot_index = 0; slot_index < num_slots && table_index < table_size; slot_index++) {
+ unsigned bit_mask = 1;
+ for (bit_index = 0; bit_index < bits_per_slot && table_index < table_size; bit_index++) {
+ /* skip any 8-bit formats */
+ if (table_index >= 2 && (mask->bits[slot_index] & bit_mask) != 0) {
+ /* just return the first one which will be at least 16-bit */
+ return (int)pcm_format_value_map[table_index];
+ }
+ bit_mask <<= 1;
+ table_index++;
+ }
+ }
+
+ return PCM_FORMAT_INVALID;
+}