[RFC PATCH 1/6] ALSA: compress: add Sample Rate Converter codec support
From: Shengjiu Wang <hidden>
Date: 2024-08-06 10:47:42
Also in:
alsa-devel, linux-sound, lkml
Subsystem:
sound, sound - compressed audio, the rest · Maintainers:
Jaroslav Kysela, Takashi Iwai, Vinod Koul, Linus Torvalds
Add Sample Rate Converter(SRC) codec support, define the output format and rate for SRC. Signed-off-by: Shengjiu Wang <redacted> --- include/uapi/sound/compress_offload.h | 2 ++ include/uapi/sound/compress_params.h | 9 ++++++++- 2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/include/uapi/sound/compress_offload.h b/include/uapi/sound/compress_offload.h
index 98772b0cbcb7..8b2b72f94e26 100644
--- a/include/uapi/sound/compress_offload.h
+++ b/include/uapi/sound/compress_offload.h@@ -112,10 +112,12 @@ struct snd_compr_codec_caps { * end of the track * @SNDRV_COMPRESS_ENCODER_DELAY: no of samples inserted by the encoder at the * beginning of the track + * @SNDRV_COMPRESS_SRC_RATIO_MOD: Resampling Ratio Modifier for sample rate converter */ enum sndrv_compress_encoder { SNDRV_COMPRESS_ENCODER_PADDING = 1, SNDRV_COMPRESS_ENCODER_DELAY = 2, + SNDRV_COMPRESS_SRC_RATIO_MOD = 3, }; /**
diff --git a/include/uapi/sound/compress_params.h b/include/uapi/sound/compress_params.h
index ddc77322d571..0843773ea6b4 100644
--- a/include/uapi/sound/compress_params.h
+++ b/include/uapi/sound/compress_params.h@@ -43,7 +43,8 @@ #define SND_AUDIOCODEC_BESPOKE ((__u32) 0x0000000E) #define SND_AUDIOCODEC_ALAC ((__u32) 0x0000000F) #define SND_AUDIOCODEC_APE ((__u32) 0x00000010) -#define SND_AUDIOCODEC_MAX SND_AUDIOCODEC_APE +#define SND_AUDIOCODEC_SRC ((__u32) 0x00000011) +#define SND_AUDIOCODEC_MAX SND_AUDIOCODEC_SRC /* * Profile and modes are listed with bit masks. This allows for a
@@ -324,6 +325,11 @@ struct snd_dec_ape { __u32 seek_table_present; } __attribute__((packed, aligned(4))); +struct snd_dec_src { + __u32 format_out; + __u32 rate_out; +} __attribute__((packed, aligned(4))); + union snd_codec_options { struct snd_enc_wma wma; struct snd_enc_vorbis vorbis;
@@ -334,6 +340,7 @@ union snd_codec_options { struct snd_dec_wma wma_d; struct snd_dec_alac alac_d; struct snd_dec_ape ape_d; + struct snd_dec_src src; } __attribute__((packed, aligned(4))); /** struct snd_codec_desc - description of codec capabilities
--
2.34.1