diff options
| -rw-r--r-- | src/audioOutputs/audioOutput_oss.c | 238 |
1 files changed, 234 insertions, 4 deletions
diff --git a/src/audioOutputs/audioOutput_oss.c b/src/audioOutputs/audioOutput_oss.c index 70ae04695..b3ad9bff4 100644 --- a/src/audioOutputs/audioOutput_oss.c +++ b/src/audioOutputs/audioOutput_oss.c @@ -52,20 +52,211 @@ typedef struct _OssData { int sampleRate; int bitFormat; int bits; + int * supported[3]; + int numSupported[3]; + int * unsupported[3]; + int numUnsupported[3]; } OssData; +#define OSS_SUPPORTED 1 +#define OSS_UNSUPPORTED 0 +#define OSS_UNKNOWN -1 + +#define OSS_RATE 0 +#define OSS_CHANNELS 1 +#define OSS_BITS 2 + +static int getIndexForParam(int param) { + int index = 0; + + switch(param) { + case SNDCTL_DSP_SPEED: + index = OSS_RATE; + break; + case SNDCTL_DSP_CHANNELS: + index = OSS_CHANNELS; + break; + case SNDCTL_DSP_SAMPLESIZE: + index = OSS_BITS; + break; + } + + return index; +} + +static int findSupportedParam(OssData * od, int param, int val) { + int i; + int index = getIndexForParam(param); + + for(i = 0; i < od->numSupported[index]; i++) { + if(od->supported[index][i] == val) return 1; + } + + return 0; +} + +static int canConvert(int index, int val) { + switch(index) { + case OSS_BITS: + if(val!=16) return 0; + break; + case OSS_CHANNELS: + if(val!=2) return 0; + break; + } + + return 1; +} + +static int getSupportedParam(OssData * od, int param, int val) { + int i; + int index = getIndexForParam(param); + int ret = -1; + int least = val; + int diff; + + for(i = 0; i < od->numSupported[index]; i++) { + diff = od->supported[index][i]-val; + if(diff < 0) diff = -diff; + if(diff < least) { + if(!canConvert(index, od->supported[index][i])) { + continue; + } + least = diff; + ret = od->supported[index][i]; + } + } + + return ret; +} + +static int findUnsupportedParam(OssData * od, int param, int val) { + int i; + int index = getIndexForParam(param); + + for(i = 0; i < od->numUnsupported[index]; i++) { + if(od->unsupported[index][i] == val) return 1; + } + + return 0; +} + +static void addSupportedParam(OssData * od, int param, int val) { + int index = getIndexForParam(param); + + od->numSupported[index]++; + od->supported[index] = realloc(od->supported[index], + od->numSupported[index]*sizeof(int)); + od->supported[index][od->numSupported[index]-1] = val; +} + +static void addUnsupportedParam(OssData * od, int param, int val) { + int index = getIndexForParam(param); + + od->numUnsupported[index]++; + od->unsupported[index] = realloc(od->unsupported[index], + od->numUnsupported[index]*sizeof(int)); + od->unsupported[index][od->numUnsupported[index]-1] = val; +} + +static void removeSupportedParam(OssData * od, int param, int val) { + int i = 0; + int j = 0; + int index = getIndexForParam(param); + + for(i = 0; i < od->numSupported[index]-1; i++) { + if(od->supported[index][i] == val) j = 1; + od->supported[index][i] = od->supported[index][i+j]; + } + + od->numSupported[index]--; + od->supported[index] = realloc(od->supported[index], + od->numSupported[index]*sizeof(int)); +} + +static void removeUnsupportedParam(OssData * od, int param, int val) { + int i = 0; + int j = 0; + int index = getIndexForParam(param); + + for(i = 0; i < od->numUnsupported[index]-1; i++) { + if(od->unsupported[index][i] == val) j = 1; + od->unsupported[index][i] = od->unsupported[index][i+j]; + } + + od->numUnsupported[index]--; + od->unsupported[index] = realloc(od->unsupported[index], + od->numUnsupported[index]*sizeof(int)); +} + +static int isSupportedParam(OssData * od, int param, int val) { + if(findSupportedParam(od, param, val)) return OSS_SUPPORTED; + if(findUnsupportedParam(od, param, val)) return OSS_UNSUPPORTED; + return OSS_UNKNOWN; +} + +static void supportParam(OssData * od, int param, int val) { + int supported = isSupportedParam(od, param, val); + + if(supported == OSS_SUPPORTED) return; + + if(supported == OSS_UNSUPPORTED) { + removeUnsupportedParam(od, param, val); + } + + addSupportedParam(od, param, val); +} + +static void unsupportParam(OssData * od, int param, int val) { + int supported = isSupportedParam(od, param, val); + + if(supported == OSS_UNSUPPORTED) return; + + if(supported == OSS_SUPPORTED) { + removeSupportedParam(od, param, val); + } + + addUnsupportedParam(od, param, val); +} + static OssData * newOssData() { OssData * ret = malloc(sizeof(OssData)); ret->device = NULL; ret->fd = -1; + ret->supported[OSS_RATE] = NULL; + ret->supported[OSS_CHANNELS] = NULL; + ret->supported[OSS_BITS] = NULL; + ret->unsupported[OSS_RATE] = NULL; + ret->unsupported[OSS_CHANNELS] = NULL; + ret->unsupported[OSS_BITS] = NULL; + + ret->numSupported[OSS_RATE] = 0; + ret->numSupported[OSS_CHANNELS] = 0; + ret->numSupported[OSS_BITS] = 0; + ret->numUnsupported[OSS_RATE] = 0; + ret->numUnsupported[OSS_CHANNELS] = 0; + ret->numUnsupported[OSS_BITS] = 0; + + supportParam(ret, SNDCTL_DSP_SPEED, 48000); + supportParam(ret, SNDCTL_DSP_SPEED, 44100); + supportParam(ret, SNDCTL_DSP_CHANNELS, 2); + supportParam(ret, SNDCTL_DSP_SAMPLESIZE, 16); + return ret; } static void freeOssData(OssData * od) { if(od->device) free(od->device); + if(od->supported[OSS_RATE]) free(od->supported[OSS_RATE]); + if(od->supported[OSS_CHANNELS]) free(od->supported[OSS_CHANNELS]); + if(od->supported[OSS_BITS]) free(od->supported[OSS_BITS]); + if(od->unsupported[OSS_RATE]) free(od->unsupported[OSS_RATE]); + if(od->unsupported[OSS_CHANNELS]) free(od->unsupported[OSS_CHANNELS]); + if(od->unsupported[OSS_BITS]) free(od->unsupported[OSS_BITS]); + free(od); } @@ -158,6 +349,35 @@ static void oss_finishDriver(AudioOutput * audioOutput) { freeOssData(od); } +static int setParam(OssData * od, int param, int * value) { + int val = *value; + int copy; + int supported = isSupportedParam(od, param, val); + + do { + if(supported == OSS_UNSUPPORTED) { + val = getSupportedParam(od, param, val); + if(copy < 0) return -1; + } + copy = val; + if(ioctl(od->fd, param, ©)) { + unsupportParam(od, param, val); + supported = OSS_UNSUPPORTED; + } + else { + if(supported == OSS_UNKNOWN) { + supportParam(od, param, val); + supported = OSS_SUPPORTED; + } + val = copy; + } + } while( supported == OSS_UNSUPPORTED ); + + *value = val; + + return 0; +} + static int oss_open(AudioOutput * audioOutput) { OssData * od = audioOutput->data; @@ -174,7 +394,7 @@ static int oss_open(AudioOutput * audioOutput) { goto fail; } - if(ioctl(od->fd, SNDCTL_DSP_CHANNELS, &od->channels)) { + if(setParam(od, SNDCTL_DSP_CHANNELS, &od->channels)) { ERROR("OSS device \"%s\" does not support %i channels: %s\n", od->device, od->channels, @@ -182,7 +402,7 @@ static int oss_open(AudioOutput * audioOutput) { goto fail; } - if(ioctl(od->fd, SNDCTL_DSP_SPEED, &od->sampleRate)) { + if(setParam(od, SNDCTL_DSP_SPEED, &od->sampleRate)) { ERROR("OSS device \"%s\" does not support %i Hz audio: %s\n", od->device, od->sampleRate, @@ -190,7 +410,7 @@ static int oss_open(AudioOutput * audioOutput) { goto fail; } - if(ioctl(od->fd, SNDCTL_DSP_SAMPLESIZE, &od->bits)) { + if(setParam(od, SNDCTL_DSP_SAMPLESIZE, &od->bits)) { ERROR("OSS device \"%s\" does not support %i bit audio: %s\n", od->device, od->bits, @@ -210,6 +430,7 @@ fail: static int oss_openDevice(AudioOutput * audioOutput) { + int ret = -1; OssData * od = audioOutput->data; AudioFormat * audioFormat = &audioOutput->outAudioFormat; #ifdef WORDS_BIGENDIAN @@ -221,7 +442,16 @@ static int oss_openDevice(AudioOutput * audioOutput) od->sampleRate = audioFormat->sampleRate; od->bits = audioFormat->bits; - return oss_open(audioOutput); + ret = oss_open(audioOutput); + + audioFormat->channels = od->channels; + audioFormat->sampleRate = od->sampleRate; + audioFormat->bits = od->bits; + + DEBUG("oss device \"%s\" will be playing %i channel audio at %i Hz\n", + od->device, od->channels, od->sampleRate); + + return ret; } static void oss_closeDevice(AudioOutput * audioOutput) { |