Merge "hal: Fix alignement of of buffer sent to DSP"

#define MIN_COMPRESS_PASSTHROUGH_FRAGMENT_SIZE (2 * 1024)

#define MAX_COMPRESS_PASSTHROUGH_FRAGMENT_SIZE (8 * 1024)

#define ALIGN( num, to ) (((num) + (to-1)) & (~(to-1)))

#define DIV_ROUND_UP(x, y) (((x) + (y) - 1)/(y))

#define ALIGN(x, y) ((y) * DIV_ROUND_UP((x), (y)))

/*

 * This file will have a maximum of 38 bytes:

 *

                     * info->sample_rate

                     * (bits_per_sample >> 3)

                     * popcount(info->channel_mask))/1000;

    // align with LCM of 2, 4, 6, 8

    fragment_size = ALIGN( fragment_size, 24 );

    if(fragment_size < MIN_PCM_OFFLOAD_FRAGMENT_SIZE)

        fragment_size = MIN_PCM_OFFLOAD_FRAGMENT_SIZE;

    else if(fragment_size > MAX_PCM_OFFLOAD_FRAGMENT_SIZE)

        fragment_size = MAX_PCM_OFFLOAD_FRAGMENT_SIZE;

    // To have same PCM samples for all channels, the buffer size requires to

    // be multiple of (number of channels * bytes per sample)

    // For writes to succeed, the buffer must be written at address which is multiple of 32

    // Alignment of 96 satsfies both of the above requirements

    fragment_size = ALIGN(fragment_size, 96);

    ALOGI("PCM offload Fragment size to %d bytes", fragment_size);

    return fragment_size;