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Use buflib for the allocation of voice PCM resources.

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Buffers are not allocated and thread is not created until the first
call where voice is required.

Adds a different callback (sync_callback) to buflib so that other
sorts of synchonization are possible, such as briefly locking-out the
PCM callback for a buffer move. It's sort of a messy addition but it
is needed so voice decoding won't have to be stopped when its buffer
is moved.

Change-Id: I4d4d8c35eed5dd15fb7ee7df9323af3d036e92b3
This commit is contained in:
Michael Sevakis 2012-05-02 17:22:28 -04:00
parent 3d3a144cf6
commit da6cebb6b0
13 changed files with 244 additions and 132 deletions
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10
firmware/pcm_mixer.c
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@ -406,6 +406,16 @@ void mixer_channel_calculate_peaks(enum pcm_mixer_channel channel,
*right = peaks->val[1];
}
/* Adjust channel pointer by a given offset to support movable buffers */
void mixer_adjust_channel_address(enum pcm_mixer_channel channel,
off_t offset)
{
pcm_play_lock();
/* Makes no difference if it's stopped */
channels[channel].start += offset;
pcm_play_unlock();
}
/* Stop ALL channels and PCM and reset state */
void mixer_reset(void)
{