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implemented snd_pcm_rewindable() and snd_pcm_forwardable(), removed can_rewind and can_forward

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This commit is contained in:
Jaroslav Kysela 2008-04-21 12:46:50 +02:00
parent 058dde8b7d
commit c88672d86f
17 changed files with 212 additions and 55 deletions
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80
src/pcm/pcm.c
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@ -1111,6 +1111,25 @@ int snd_pcm_pause(snd_pcm_t *pcm, int enable)
return pcm->fast_ops->pause(pcm->fast_op_arg, enable);
}
/**
* \brief Get safe count of frames which can be rewinded
* \param pcm PCM handle
* \return a positive number of frames or negative error code
*
* Note: The snd_pcm_rewind() can accept bigger value than returned
* by this function. But it is not guaranteed that output stream
* will be consistent with bigger value.
*/
snd_pcm_sframes_t snd_pcm_rewindable(snd_pcm_t *pcm)
{
assert(pcm);
if (CHECK_SANITY(! pcm->setup)) {
SNDMSG("PCM not set up");
return -EIO;
}
return pcm->fast_ops->rewindable(pcm->fast_op_arg);
}
/**
* \brief Move application frame position backward
* \param pcm PCM handle
@ -1130,6 +1149,25 @@ snd_pcm_sframes_t snd_pcm_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
return pcm->fast_ops->rewind(pcm->fast_op_arg, frames);
}
/**
* \brief Get safe count of frames which can be forwarded
* \param pcm PCM handle
* \return a positive number of frames or negative error code
*
* Note: The snd_pcm_forward() can accept bigger value than returned
* by this function. But it is not guaranteed that output stream
* will be consistent with bigger value.
*/
snd_pcm_sframes_t snd_pcm_forwardable(snd_pcm_t *pcm)
{
assert(pcm);
if (CHECK_SANITY(! pcm->setup)) {
SNDMSG("PCM not set up");
return -EIO;
}
return pcm->fast_ops->forwardable(pcm->fast_op_arg);
}
/**
* \brief Move application frame position forward
* \param pcm PCM handle
@ -2853,48 +2891,6 @@ int snd_pcm_hw_params_can_overrange(const snd_pcm_hw_params_t *params)
return !!(params->info & SNDRV_PCM_INFO_OVERRANGE);
}
/**
* \brief Check, if device supports forward
* \param params Configuration space
* \return Boolean value
* \retval 0 Device doesn't support forward
* \retval 1 Device supports forward
*
* It is not allowed to call this function when given configuration is not exactly one.
* Usually, #snd_pcm_hw_params() function chooses one configuration
* from the configuration space.
*/
int snd_pcm_hw_params_can_forward(const snd_pcm_hw_params_t *params)
{
assert(params);
if (CHECK_SANITY(params->info == ~0U)) {
SNDMSG("invalid PCM info field");
return 0; /* FIXME: should be a negative error? */
}
return !!(params->info & SND_PCM_INFO_FORWARD);
}
/**
* \brief Check, if device supports rewind
* \param params Configuration space
* \return Boolean value
* \retval 0 Device doesn't support rewind
* \retval 1 Device supports rewind
*
* It is not allowed to call this function when given configuration is not exactly one.
* Usually, #snd_pcm_hw_params() function chooses one configuration
* from the configuration space.
*/
int snd_pcm_hw_params_can_rewind(const snd_pcm_hw_params_t *params)
{
assert(params);
if (CHECK_SANITY(params->info == ~0U)) {
SNDMSG("invalid PCM info field");
return 0; /* FIXME: should be a negative error? */
}
return !!(params->info & SND_PCM_INFO_REWIND);
}
/**
* \brief Check, if hardware supports pause
* \param params Configuration space