summaryrefslogtreecommitdiff
path: root/sound/core
diff options
context:
space:
mode:
authorJyri Sarha <jsarha@ti.com>2016-03-31 16:35:58 +0300
committerMark Brown <broonie@kernel.org>2016-04-06 21:47:48 +0300
commit4a4436573a6669516f73bac25016683d396ed4c4 (patch)
treea776d721808873a645baba6f25a0f973c7995c24 /sound/core
parentf55532a0c0b8bb6148f4e07853b876ef73bc69ca (diff)
downloadlinux-4a4436573a6669516f73bac25016683d396ed4c4.tar.xz
ALSA: pcm: add IEC958 channel status helper for hw_params
Add IEC958 channel status helper that gets the audio properties from snd_pcm_hw_params instead of snd_pcm_runtime. This is needed to produce the channel status bits already in audio stream configuration phase. Signed-off-by: Jyri Sarha <jsarha@ti.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/core')
-rw-r--r--sound/core/pcm_iec958.c64
1 files changed, 47 insertions, 17 deletions
diff --git a/sound/core/pcm_iec958.c b/sound/core/pcm_iec958.c
index 36b2d7aca1bd..e016871a978f 100644
--- a/sound/core/pcm_iec958.c
+++ b/sound/core/pcm_iec958.c
@@ -9,30 +9,18 @@
#include <linux/types.h>
#include <sound/asoundef.h>
#include <sound/pcm.h>
+#include <sound/pcm_params.h>
#include <sound/pcm_iec958.h>
-/**
- * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
- * @runtime: pcm runtime structure with ->rate filled in
- * @cs: channel status buffer, at least four bytes
- * @len: length of channel status buffer
- *
- * Create the consumer format channel status data in @cs of maximum size
- * @len corresponding to the parameters of the PCM runtime @runtime.
- *
- * Drivers may wish to tweak the contents of the buffer after creation.
- *
- * Returns: length of buffer, or negative error code if something failed.
- */
-int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
- size_t len)
+static int create_iec958_consumer(uint rate, uint sample_width,
+ u8 *cs, size_t len)
{
unsigned int fs, ws;
if (len < 4)
return -EINVAL;
- switch (runtime->rate) {
+ switch (rate) {
case 32000:
fs = IEC958_AES3_CON_FS_32000;
break;
@@ -59,7 +47,7 @@ int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
}
if (len > 4) {
- switch (snd_pcm_format_width(runtime->format)) {
+ switch (sample_width) {
case 16:
ws = IEC958_AES4_CON_WORDLEN_20_16;
break;
@@ -92,4 +80,46 @@ int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
return len;
}
+
+/**
+ * snd_pcm_create_iec958_consumer - create consumer format IEC958 channel status
+ * @runtime: pcm runtime structure with ->rate filled in
+ * @cs: channel status buffer, at least four bytes
+ * @len: length of channel status buffer
+ *
+ * Create the consumer format channel status data in @cs of maximum size
+ * @len corresponding to the parameters of the PCM runtime @runtime.
+ *
+ * Drivers may wish to tweak the contents of the buffer after creation.
+ *
+ * Returns: length of buffer, or negative error code if something failed.
+ */
+int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
+ size_t len)
+{
+ return create_iec958_consumer(runtime->rate,
+ snd_pcm_format_width(runtime->format),
+ cs, len);
+}
EXPORT_SYMBOL(snd_pcm_create_iec958_consumer);
+
+/**
+ * snd_pcm_create_iec958_consumer_hw_params - create IEC958 channel status
+ * @hw_params: the hw_params instance for extracting rate and sample format
+ * @cs: channel status buffer, at least four bytes
+ * @len: length of channel status buffer
+ *
+ * Create the consumer format channel status data in @cs of maximum size
+ * @len corresponding to the parameters of the PCM runtime @runtime.
+ *
+ * Drivers may wish to tweak the contents of the buffer after creation.
+ *
+ * Returns: length of buffer, or negative error code if something failed.
+ */
+int snd_pcm_create_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
+ u8 *cs, size_t len)
+{
+ return create_iec958_consumer(params_rate(params), params_width(params),
+ cs, len);
+}
+EXPORT_SYMBOL(snd_pcm_create_iec958_consumer_hw_params);