From d8ce72f2561f23293ad0d98d30060c4a80a74c36 Mon Sep 17 00:00:00 2001 From: Jaroslav Kysela Date: Fri, 9 Feb 2024 11:21:04 +0100 Subject: [PATCH] pcm: plug - add automatic conversion for iec958 subframe samples As Pavel noted, a possibility to automatically convert standard linear samples to iec958 subframe format would be handy for latest Raspberry HDMI driver. Link: https://lore.kernel.org/alsa-devel/81b0be0a-5ab7-db91-21cb-0c59a55291e9@ivitera.com/ Suggested-by: Pavel Hofman Signed-off-by: Jaroslav Kysela --- configure.ac | 3 +++ include/pcm_plugin.h | 13 +++++++++++++ src/pcm/pcm_plug.c | 31 ++++++++++++++++++++++++++++++- 3 files changed, 46 insertions(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index 7a152a4ab..3f2383027 100644 --- a/configure.ac +++ b/configure.ac @@ -642,6 +642,9 @@ fi if test "$build_pcm_alaw" = "yes"; then AC_DEFINE([BUILD_PCM_PLUGIN_ALAW], "1", [Build PCM alaw plugin]) fi +if test "$build_pcm_iec958" = "yes"; then + AC_DEFINE([BUILD_PCM_PLUGIN_IEC958], "1", [Build PCM iec958 plugin]) +fi if test "$build_pcm_mmap_emul" = "yes"; then AC_DEFINE([BUILD_PCM_PLUGIN_MMAP_EMUL], "1", [Build PCM mmap-emul plugin]) fi diff --git a/include/pcm_plugin.h b/include/pcm_plugin.h index 2d014394a..f3e8f3b57 100644 --- a/include/pcm_plugin.h +++ b/include/pcm_plugin.h @@ -133,6 +133,19 @@ int _snd_pcm_adpcm_open(snd_pcm_t **pcmp, const char *name, snd_config_t *root, snd_config_t *conf, snd_pcm_stream_t stream, int mode); +/* + * IEC958 subframe conversion plugin + */ +int snd_pcm_iec958_open(snd_pcm_t **pcmp, const char *name, + snd_pcm_format_t sformat, snd_pcm_t *slave, + int close_slave, + const unsigned char *status_bits, + const unsigned char *preamble_vals, + int hdmi_mode); +int _snd_pcm_iec958_open(snd_pcm_t **pcmp, const char *name, + snd_config_t *root, snd_config_t *conf, + snd_pcm_stream_t stream, int mode); + /* * Route plugin for linear formats */ diff --git a/src/pcm/pcm_plug.c b/src/pcm/pcm_plug.c index e5a3a1892..bd681a9f3 100644 --- a/src/pcm/pcm_plug.c +++ b/src/pcm/pcm_plug.c @@ -186,7 +186,8 @@ static const snd_pcm_format_t linear_preferred_formats[] = { #if defined(BUILD_PCM_PLUGIN_MULAW) || \ defined(BUILD_PCM_PLUGIN_ALAW) || \ - defined(BUILD_PCM_PLUGIN_ADPCM) + defined(BUILD_PCM_PLUGIN_ADPCM) || \ + defined(BUILD_PCM_PLUGIN_IEC958) #define BUILD_PCM_NONLINEAR #endif @@ -201,6 +202,10 @@ static const snd_pcm_format_t nonlinear_preferred_formats[] = { #ifdef BUILD_PCM_PLUGIN_ADPCM SND_PCM_FORMAT_IMA_ADPCM, #endif +#ifdef BUILD_PCM_PLUGIN_IEC958 + SND_PCM_FORMAT_IEC958_SUBFRAME_LE, + SND_PCM_FORMAT_IEC958_SUBFRAME_BE, +#endif }; #endif @@ -490,6 +495,18 @@ static int snd_pcm_plug_change_channels(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm } #endif +#ifdef BUILD_PCM_PLUGIN_IEC958 +static int iec958_open(snd_pcm_t **pcmp, const char *name, + snd_pcm_format_t sformat, snd_pcm_t *slave, + int close_slave) +{ + unsigned char preamble_vals[3] = { + 0x08, 0x02, 0x04 /* Z, X, Y */ + }; + return snd_pcm_iec958_open(pcmp, name, sformat, slave, close_slave, NULL, preamble_vals, 0); +} +#endif + static int snd_pcm_plug_change_format(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm_plug_params_t *clt, snd_pcm_plug_params_t *slv) { snd_pcm_plug_t *plug = pcm->private_data; @@ -526,6 +543,12 @@ static int snd_pcm_plug_change_format(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm_p case SND_PCM_FORMAT_IMA_ADPCM: f = snd_pcm_adpcm_open; break; +#endif +#ifdef BUILD_PCM_PLUGIN_IEC958 + case SND_PCM_FORMAT_IEC958_SUBFRAME_LE: + case SND_PCM_FORMAT_IEC958_SUBFRAME_BE: + f = iec958_open; + break; #endif default: #ifdef BUILD_PCM_PLUGIN_LFLOAT @@ -566,6 +589,12 @@ static int snd_pcm_plug_change_format(snd_pcm_t *pcm, snd_pcm_t **new, snd_pcm_p case SND_PCM_FORMAT_IMA_ADPCM: f = snd_pcm_adpcm_open; break; +#endif +#ifdef BUILD_PCM_PLUGIN_IEC958 + case SND_PCM_FORMAT_IEC958_SUBFRAME_LE: + case SND_PCM_FORMAT_IEC958_SUBFRAME_BE: + f = iec958_open; + break; #endif default: return -EINVAL;