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On big-endian architectures, all audio decoders default to big-endian 16-bit

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audio sample format.

Add support to play both big- and little-endian 16-bit audio format to the
sun audio_out driver.


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1321 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
jkeil 2001-07-14 16:58:55 +00:00
parent 7b813ca0ec
commit 61bce79d66
2 changed files with 22 additions and 6 deletions
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4
dec_audio.c
View File

@ -61,7 +61,11 @@ extern int init_acm_audio_codec(sh_audio_t *sh_audio);
extern int acm_decode_audio(sh_audio_t *sh_audio, void* a_buffer,int minlen,int maxlen);
sh_audio->samplesize=2;
#if WORDS_BIGENDIAN
sh_audio->sample_format=AFMT_S16_BE;
#else
sh_audio->sample_format=AFMT_S16_LE;
#endif
sh_audio->samplerate=0;
//sh_audio->pcm_bswap=0;

24
libao2/ao_sun.c
View File

@ -72,6 +72,7 @@ static int oss2sunfmt(int oss_format)
return AUDIO_ENCODING_ULAW;
case AFMT_A_LAW:
return AUDIO_ENCODING_ALAW;
case AFMT_S16_BE:
case AFMT_S16_LE:
return AUDIO_ENCODING_LINEAR;
case AFMT_U8:
@ -248,7 +249,10 @@ static int init(int rate,int channels,int format,int flags){
AUDIO_INITINFO(&info);
info.play.encoding = oss2sunfmt(ao_format = format);
info.play.precision = (format==AFMT_S16_LE? AUDIO_PRECISION_16:AUDIO_PRECISION_8);
info.play.precision =
(format==AFMT_S16_LE || format==AFMT_S16_BE
? AUDIO_PRECISION_16
: AUDIO_PRECISION_8);
info.play.channels = ao_channels = channels;
info.play.sample_rate = ao_samplerate = rate;
if(ioctl (audio_fd, AUDIO_SETINFO, &info)<0)
@ -331,7 +335,10 @@ static void reset(){
AUDIO_INITINFO(&info);
info.play.encoding = oss2sunfmt(ao_format);
info.play.precision = (ao_format==AFMT_S16_LE? AUDIO_PRECISION_16:AUDIO_PRECISION_8);
info.play.precision =
(ao_format==AFMT_S16_LE || ao_format==AFMT_S16_BE
? AUDIO_PRECISION_16
: AUDIO_PRECISION_8);
info.play.channels = ao_channels;
info.play.sample_rate = ao_samplerate;
info.play.samples = 0;
@ -390,16 +397,22 @@ static int get_space(){
// it should round it down to outburst*n
// return: number of bytes played
static int play(void* data,int len,int flags){
#if WORDS_BIGENDIAN
int native_endian = AFMT_S16_BE;
#else
int native_endian = AFMT_S16_LE;
#endif
if (len < ao_outburst) return 0;
len /= ao_outburst;
len *= ao_outburst;
#if WORDS_BIGENDIAN
{
/* 16-bit format using the 'wrong' byteorder? swap words */
if ((ao_format == AFMT_S16_LE || ao_format == AFMT_S16_BE)
&& ao_format != native_endian) {
static void *swab_buf;
static int swab_len;
if (ao_format == AFMT_S16_LE && len > swab_len) {
if (len > swab_len) {
if (swab_buf)
swab_buf = realloc(swab_buf, len);
else
@ -410,7 +423,6 @@ static int play(void* data,int len,int flags){
swab(data, swab_buf, len);
data = swab_buf;
}
#endif
len = write(audio_fd, data, len);
if(len > 0) {