[ALSA] Support 3-bytes 24bit format in PCM OSS emulation
Takashi Iwai [Wed, 8 Aug 2007 14:49:08 +0000 (16:49 +0200)]
Add the support of 3-bytes 24bit formats in PCM OSS emulation.
Also removed snd_pcm_build_linear_format() function.  It's exported
just for OSS emulation, and now the code was changed without calling
this function.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

sound/core/oss/pcm_plugin.c
sound/core/pcm_misc.c

index c0afb92..25dcf96 100644 (file)
@@ -264,6 +264,8 @@ static int snd_pcm_plug_formats(struct snd_mask *mask, int format)
                       SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
                       SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
                       SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
+                      SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
+                      SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
                       SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
                       SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
        snd_mask_set(&formats, SNDRV_PCM_FORMAT_MU_LAW);
@@ -280,6 +282,10 @@ static int preferred_formats[] = {
        SNDRV_PCM_FORMAT_S16_BE,
        SNDRV_PCM_FORMAT_U16_LE,
        SNDRV_PCM_FORMAT_U16_BE,
+       SNDRV_PCM_FORMAT_S24_3LE,
+       SNDRV_PCM_FORMAT_S24_3BE,
+       SNDRV_PCM_FORMAT_U24_3LE,
+       SNDRV_PCM_FORMAT_U24_3BE,
        SNDRV_PCM_FORMAT_S24_LE,
        SNDRV_PCM_FORMAT_S24_BE,
        SNDRV_PCM_FORMAT_U24_LE,
@@ -294,41 +300,37 @@ static int preferred_formats[] = {
 
 int snd_pcm_plug_slave_format(int format, struct snd_mask *format_mask)
 {
+       int i;
+
        if (snd_mask_test(format_mask, format))
                return format;
        if (! snd_pcm_plug_formats(format_mask, format))
                return -EINVAL;
        if (snd_pcm_format_linear(format)) {
-               int width = snd_pcm_format_width(format);
-               int unsignd = snd_pcm_format_unsigned(format);
-               int big = snd_pcm_format_big_endian(format);
-               int format1;
-               int wid, width1=width;
-               int dwidth1 = 8;
-               for (wid = 0; wid < 4; ++wid) {
-                       int end, big1 = big;
-                       for (end = 0; end < 2; ++end) {
-                               int sgn, unsignd1 = unsignd;
-                               for (sgn = 0; sgn < 2; ++sgn) {
-                                       format1 = snd_pcm_build_linear_format(width1, unsignd1, big1);
-                                       if (format1 >= 0 &&
-                                           snd_mask_test(format_mask, format1))
-                                               goto _found;
-                                       unsignd1 = !unsignd1;
-                               }
-                               big1 = !big1;
-                       }
-                       if (width1 == 32) {
-                               dwidth1 = -dwidth1;
-                               width1 = width;
+               unsigned int width = snd_pcm_format_width(format);
+               int unsignd = snd_pcm_format_unsigned(format) > 0;
+               int big = snd_pcm_format_big_endian(format) > 0;
+               unsigned int badness, best = -1;
+               int best_format = -1;
+               for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
+                       int f = preferred_formats[i];
+                       unsigned int w;
+                       if (!snd_mask_test(format_mask, f))
+                               continue;
+                       w = snd_pcm_format_width(f);
+                       if (w >= width)
+                               badness = w - width;
+                       else
+                               badness = width - w + 32;
+                       badness += snd_pcm_format_unsigned(f) != unsignd;
+                       badness += snd_pcm_format_big_endian(f) != big;
+                       if (badness < best) {
+                               best_format = f;
+                               best = badness;
                        }
-                       width1 += dwidth1;
                }
-               return -EINVAL;
-       _found:
-               return format1;
+               return best_format >= 0 ? best_format : -EINVAL;
        } else {
-               unsigned int i;
                switch (format) {
                case SNDRV_PCM_FORMAT_MU_LAW:
                        for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
index 0019c59..9142fce 100644 (file)
@@ -422,38 +422,6 @@ int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int
 
 EXPORT_SYMBOL(snd_pcm_format_set_silence);
 
-/* [width][unsigned][bigendian] */
-static int linear_formats[4][2][2] = {
-       {{ SNDRV_PCM_FORMAT_S8, SNDRV_PCM_FORMAT_S8},
-        { SNDRV_PCM_FORMAT_U8, SNDRV_PCM_FORMAT_U8}},
-       {{SNDRV_PCM_FORMAT_S16_LE, SNDRV_PCM_FORMAT_S16_BE},
-        {SNDRV_PCM_FORMAT_U16_LE, SNDRV_PCM_FORMAT_U16_BE}},
-       {{SNDRV_PCM_FORMAT_S24_LE, SNDRV_PCM_FORMAT_S24_BE},
-        {SNDRV_PCM_FORMAT_U24_LE, SNDRV_PCM_FORMAT_U24_BE}},
-       {{SNDRV_PCM_FORMAT_S32_LE, SNDRV_PCM_FORMAT_S32_BE},
-        {SNDRV_PCM_FORMAT_U32_LE, SNDRV_PCM_FORMAT_U32_BE}}
-};
-
-/**
- * snd_pcm_build_linear_format - return the suitable linear format for the given condition
- * @width: the bit-width
- * @unsignd: 1 if unsigned, 0 if signed.
- * @big_endian: 1 if big-endian, 0 if little-endian
- *
- * Returns the suitable linear format for the given condition.
- */
-snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian)
-{
-       if (width & 7)
-               return SND_PCM_FORMAT_UNKNOWN;
-       width = (width / 8) - 1;
-       if (width < 0 || width >= 4)
-               return SND_PCM_FORMAT_UNKNOWN;
-       return linear_formats[width][!!unsignd][!!big_endian];
-}
-
-EXPORT_SYMBOL(snd_pcm_build_linear_format);
-
 /**
  * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields
  * @runtime: the runtime instance