diff options
Diffstat (limited to 'media/libeffects/downmix/EffectDownmix.c')
| -rw-r--r-- | media/libeffects/downmix/EffectDownmix.c | 95 |
1 files changed, 11 insertions, 84 deletions
diff --git a/media/libeffects/downmix/EffectDownmix.c b/media/libeffects/downmix/EffectDownmix.c index 1663d47..6686f27 100644 --- a/media/libeffects/downmix/EffectDownmix.c +++ b/media/libeffects/downmix/EffectDownmix.c @@ -30,25 +30,13 @@ #define MINUS_3_DB_IN_Q19_12 2896 // -3dB = 0.707 * 2^12 = 2896 +// subset of possible audio_channel_mask_t values, and AUDIO_CHANNEL_OUT_* renamed to CHANNEL_MASK_* typedef enum { - CHANNEL_MASK_SURROUND = AUDIO_CHANNEL_OUT_SURROUND, - CHANNEL_MASK_QUAD_BACK = AUDIO_CHANNEL_OUT_QUAD, - // like AUDIO_CHANNEL_OUT_QUAD with *_SIDE_* instead of *_BACK_*, same channel order - CHANNEL_MASK_QUAD_SIDE = - AUDIO_CHANNEL_OUT_FRONT_LEFT | - AUDIO_CHANNEL_OUT_FRONT_RIGHT | - AUDIO_CHANNEL_OUT_SIDE_LEFT | - AUDIO_CHANNEL_OUT_SIDE_RIGHT, - CHANNEL_MASK_5POINT1_BACK = AUDIO_CHANNEL_OUT_5POINT1, - // like AUDIO_CHANNEL_OUT_5POINT1 with *_SIDE_* instead of *_BACK_*, same channel order - CHANNEL_MASK_5POINT1_SIDE = - AUDIO_CHANNEL_OUT_FRONT_LEFT | - AUDIO_CHANNEL_OUT_FRONT_RIGHT | - AUDIO_CHANNEL_OUT_FRONT_CENTER | - AUDIO_CHANNEL_OUT_LOW_FREQUENCY | - AUDIO_CHANNEL_OUT_SIDE_LEFT | - AUDIO_CHANNEL_OUT_SIDE_RIGHT, - CHANNEL_MASK_7POINT1_SIDE_BACK = AUDIO_CHANNEL_OUT_7POINT1, + CHANNEL_MASK_QUAD_BACK = AUDIO_CHANNEL_OUT_QUAD_BACK, + CHANNEL_MASK_QUAD_SIDE = AUDIO_CHANNEL_OUT_QUAD_SIDE, + CHANNEL_MASK_5POINT1_BACK = AUDIO_CHANNEL_OUT_5POINT1_BACK, + CHANNEL_MASK_5POINT1_SIDE = AUDIO_CHANNEL_OUT_5POINT1_SIDE, + CHANNEL_MASK_7POINT1 = AUDIO_CHANNEL_OUT_7POINT1, } downmix_input_channel_mask_t; // effect_handle_t interface implementation for downmix effect @@ -130,7 +118,7 @@ void Downmix_testIndexComputation(uint32_t mask) { hasBacks = true; } - const int numChan = popcount(mask); + const int numChan = audio_channel_count_from_out_mask(mask); const bool hasFC = ((mask & AUDIO_CHANNEL_OUT_FRONT_CENTER) == AUDIO_CHANNEL_OUT_FRONT_CENTER); const bool hasLFE = ((mask & AUDIO_CHANNEL_OUT_LOW_FREQUENCY) == AUDIO_CHANNEL_OUT_LOW_FREQUENCY); @@ -340,14 +328,11 @@ static int Downmix_Process(effect_handle_t self, case CHANNEL_MASK_QUAD_SIDE: Downmix_foldFromQuad(pSrc, pDst, numFrames, accumulate); break; - case CHANNEL_MASK_SURROUND: - Downmix_foldFromSurround(pSrc, pDst, numFrames, accumulate); - break; case CHANNEL_MASK_5POINT1_BACK: case CHANNEL_MASK_5POINT1_SIDE: Downmix_foldFrom5Point1(pSrc, pDst, numFrames, accumulate); break; - case CHANNEL_MASK_7POINT1_SIDE_BACK: + case CHANNEL_MASK_7POINT1: Downmix_foldFrom7Point1(pSrc, pDst, numFrames, accumulate); break; default: @@ -644,7 +629,8 @@ int Downmix_Configure(downmix_module_t *pDwmModule, effect_config_t *pConfig, bo ALOGE("Downmix_Configure error: input channel mask can't be 0"); return -EINVAL; } - pDownmixer->input_channel_count = popcount(pConfig->inputCfg.channels); + pDownmixer->input_channel_count = + audio_channel_count_from_out_mask(pConfig->inputCfg.channels); } Downmix_Reset(pDownmixer, init); @@ -828,65 +814,6 @@ void Downmix_foldFromQuad(int16_t *pSrc, int16_t*pDst, size_t numFrames, bool ac /*---------------------------------------------------------------------------- - * Downmix_foldFromSurround() - *---------------------------------------------------------------------------- - * Purpose: - * downmix a "surround sound" (mono rear) signal to stereo - * - * Inputs: - * pSrc surround signal to downmix - * numFrames the number of surround frames to downmix - * accumulate whether to mix (when true) the result of the downmix with the contents of pDst, - * or overwrite pDst (when false) - * - * Outputs: - * pDst downmixed stereo audio samples - * - *---------------------------------------------------------------------------- - */ -void Downmix_foldFromSurround(int16_t *pSrc, int16_t*pDst, size_t numFrames, bool accumulate) { - int32_t lt, rt, centerPlusRearContrib; // samples in Q19.12 format - // sample at index 0 is FL - // sample at index 1 is FR - // sample at index 2 is FC - // sample at index 3 is RC - // code is mostly duplicated between the two values of accumulate to avoid repeating the test - // for every sample - if (accumulate) { - while (numFrames) { - // centerPlusRearContrib = FC(-3dB) + RC(-3dB) - centerPlusRearContrib = (pSrc[2] * MINUS_3_DB_IN_Q19_12) + (pSrc[3] * MINUS_3_DB_IN_Q19_12); - // FL + centerPlusRearContrib - lt = (pSrc[0] << 12) + centerPlusRearContrib; - // FR + centerPlusRearContrib - rt = (pSrc[1] << 12) + centerPlusRearContrib; - // accumulate in destination - pDst[0] = clamp16(pDst[0] + (lt >> 13)); - pDst[1] = clamp16(pDst[1] + (rt >> 13)); - pSrc += 4; - pDst += 2; - numFrames--; - } - } else { // same code as above but without adding and clamping pDst[i] to itself - while (numFrames) { - // centerPlusRearContrib = FC(-3dB) + RC(-3dB) - centerPlusRearContrib = (pSrc[2] * MINUS_3_DB_IN_Q19_12) + (pSrc[3] * MINUS_3_DB_IN_Q19_12); - // FL + centerPlusRearContrib - lt = (pSrc[0] << 12) + centerPlusRearContrib; - // FR + centerPlusRearContrib - rt = (pSrc[1] << 12) + centerPlusRearContrib; - // store in destination - pDst[0] = clamp16(lt >> 13); // differs from when accumulate is true above - pDst[1] = clamp16(rt >> 13); // differs from when accumulate is true above - pSrc += 4; - pDst += 2; - numFrames--; - } - } -} - - -/*---------------------------------------------------------------------------- * Downmix_foldFrom5Point1() *---------------------------------------------------------------------------- * Purpose: @@ -1071,7 +998,7 @@ bool Downmix_foldGeneric( hasBacks = true; } - const int numChan = popcount(mask); + const int numChan = audio_channel_count_from_out_mask(mask); const bool hasFC = ((mask & AUDIO_CHANNEL_OUT_FRONT_CENTER) == AUDIO_CHANNEL_OUT_FRONT_CENTER); const bool hasLFE = ((mask & AUDIO_CHANNEL_OUT_LOW_FREQUENCY) == AUDIO_CHANNEL_OUT_LOW_FREQUENCY); |