On Fri, Sep 18, 2015 at 02:06:39PM +0300, Jyri Sarha wrote:
> 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 | 52 +++++++++++++++++++++++++++++++---------------
This is core ALSA code, you need to CC Takashi (added him, not cutting
context).
> 2 files changed, 37 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..c9f8b66 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 +80,34 @@ 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);
> +
> +
> +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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