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@xxxxxx>
---
include/sound/pcm_iec958.h | 2 ++
sound/core/pcm_iec958.c | 64 ++++++++++++++++++++++++++++++++++------------
2 files changed, 49 insertions(+), 17 deletions(-)
diff --git a/include/sound/pcm_iec958.h b/include/sound/pcm_iec958.h
index 0eed397..36f023a 100644
--- a/include/sound/pcm_iec958.h
+++ b/include/sound/pcm_iec958.h
@@ -6,4 +6,6 @@
int snd_pcm_create_iec958_consumer(struct snd_pcm_runtime *runtime, u8 *cs,
size_t len);
+int snd_pcm_create_iec958_consumer_hw_params(struct snd_pcm_hw_params *params,
+ u8 *cs, size_t len);
#endif
diff --git a/sound/core/pcm_iec958.c b/sound/core/pcm_iec958.c
index 36b2d7a..e016871 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);
--
1.9.1
--
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