diff options
Diffstat (limited to '')
| -rw-r--r-- | src/pcm_volume.c | 33 |
1 files changed, 13 insertions, 20 deletions
diff --git a/src/pcm_volume.c b/src/pcm_volume.c index fd62c14c1..fd8670f4b 100644 --- a/src/pcm_volume.c +++ b/src/pcm_volume.c @@ -31,9 +31,9 @@ #define G_LOG_DOMAIN "pcm_volume" static void -pcm_volume_change_8(int8_t *buffer, unsigned num_samples, int volume) +pcm_volume_change_8(int8_t *buffer, const int8_t *end, int volume) { - while (num_samples > 0) { + while (buffer < end) { int32_t sample = *buffer; sample = (sample * volume + pcm_volume_dither() + @@ -41,14 +41,13 @@ pcm_volume_change_8(int8_t *buffer, unsigned num_samples, int volume) / PCM_VOLUME_1; *buffer++ = pcm_range(sample, 8); - --num_samples; } } static void -pcm_volume_change_16(int16_t *buffer, unsigned num_samples, int volume) +pcm_volume_change_16(int16_t *buffer, const int16_t *end, int volume) { - while (num_samples > 0) { + while (buffer < end) { int32_t sample = *buffer; sample = (sample * volume + pcm_volume_dither() + @@ -56,7 +55,6 @@ pcm_volume_change_16(int16_t *buffer, unsigned num_samples, int volume) / PCM_VOLUME_1; *buffer++ = pcm_range(sample, 16); - --num_samples; } } @@ -92,9 +90,9 @@ pcm_volume_sample_24(int32_t sample, int32_t volume, G_GNUC_UNUSED int32_t dithe #endif static void -pcm_volume_change_24(int32_t *buffer, unsigned num_samples, int volume) +pcm_volume_change_24(int32_t *buffer, const int32_t *end, int volume) { - while (num_samples > 0) { + while (buffer < end) { #ifdef __i386__ /* assembly version for i386 */ int32_t sample = *buffer; @@ -110,14 +108,13 @@ pcm_volume_change_24(int32_t *buffer, unsigned num_samples, int volume) / PCM_VOLUME_1; #endif *buffer++ = pcm_range(sample, 24); - --num_samples; } } static void -pcm_volume_change_32(int32_t *buffer, unsigned num_samples, int volume) +pcm_volume_change_32(int32_t *buffer, const int32_t *end, int volume) { - while (num_samples > 0) { + while (buffer < end) { #ifdef __i386__ /* assembly version for i386 */ int32_t sample = *buffer; @@ -132,8 +129,6 @@ pcm_volume_change_32(int32_t *buffer, unsigned num_samples, int volume) / PCM_VOLUME_1; *buffer++ = pcm_range_64(sample, 32); #endif - - --num_samples; } } @@ -150,6 +145,7 @@ pcm_volume(void *buffer, size_t length, return true; } + const void *end = pcm_end_pointer(buffer, length); switch (format) { case SAMPLE_FORMAT_UNDEFINED: case SAMPLE_FORMAT_S24: @@ -157,22 +153,19 @@ pcm_volume(void *buffer, size_t length, return false; case SAMPLE_FORMAT_S8: - pcm_volume_change_8((int8_t *)buffer, length, volume); + pcm_volume_change_8(buffer, end, volume); return true; case SAMPLE_FORMAT_S16: - pcm_volume_change_16((int16_t *)buffer, length / 2, - volume); + pcm_volume_change_16(buffer, end, volume); return true; case SAMPLE_FORMAT_S24_P32: - pcm_volume_change_24((int32_t*)buffer, length / 4, - volume); + pcm_volume_change_24(buffer, end, volume); return true; case SAMPLE_FORMAT_S32: - pcm_volume_change_32((int32_t*)buffer, length / 4, - volume); + pcm_volume_change_32(buffer, end, volume); return true; } |