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Added new PCM functions (pcm_misc.c).

Browse source 
New plugins: rate, voices.
This commit is contained in:
Jaroslav Kysela 1999-11-24 17:00:16 +00:00
parent a743444ef3
commit 4a01380a7b
7 changed files with 655 additions and 33 deletions
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142
src/pcm/pcm_plugin.c
View file

@ -97,6 +97,22 @@ int snd_pcm_plugin_insert(snd_pcm_t *pcm, int channel, snd_pcm_plugin_t *plugin)
return 0;
}
int snd_pcm_plugin_append(snd_pcm_t *pcm, int channel, snd_pcm_plugin_t *plugin)
{
if (!pcm || channel < 0 || channel > 1 || !plugin)
return -EINVAL;
plugin->next = NULL;
plugin->prev = pcm->plugin_last[channel];
if (pcm->plugin_last[channel]) {
pcm->plugin_last[channel]->next = plugin;
pcm->plugin_last[channel] = plugin;
} else {
pcm->plugin_last[channel] =
pcm->plugin_first[channel] = plugin;
}
return 0;
}
int snd_pcm_plugin_remove_to(snd_pcm_t *pcm, int channel, snd_pcm_plugin_t *plugin)
{
snd_pcm_plugin_t *plugin1, *plugin1_prev;
@ -247,6 +263,9 @@ int snd_pcm_plugin_info(snd_pcm_t *pcm, snd_pcm_channel_info_t *info)
if ((err = snd_pcm_channel_info(pcm, info)) < 0)
return err;
info->formats = snd_pcm_plugin_formats(pcm, info->formats);
info->min_rate = 4000;
info->max_rate = 192000;
info->rates = SND_PCM_RATE_8000_48000;
return 0;
}
@ -372,25 +391,90 @@ int snd_pcm_plugin_params(snd_pcm_t *pcm, snd_pcm_channel_params_t *params)
*/
snd_pcm_plugin_clear(pcm, params->channel);
if (sinfo.mode == SND_PCM_MODE_STREAM) {
err = snd_pcm_plugin_build_stream(pcm, params->channel, &plugin);
} else if (sinfo.mode == SND_PCM_MODE_BLOCK) {
if (sinfo.flags & SND_PCM_CHNINFO_MMAP) {
err = snd_pcm_plugin_build_mmap(pcm, params->channel, &plugin);
} else {
err = snd_pcm_plugin_build_block(pcm, params->channel, &plugin);
if (sparams.format.voices < sinfo.min_voices ||
sparams.format.voices > sinfo.max_voices) {
int src_voices = sparams.format.voices;
int dst_voices = sparams.format.voices < sinfo.min_voices ?
sinfo.min_voices : sinfo.max_voices;
if (sparams.format.rate < sinfo.min_rate ||
sparams.format.rate > sinfo.max_rate)
dst_voices = 2;
sparams.format.voices = dst_voices;
swap_formats(params->channel, &src_voices, &dst_voices);
err = snd_pcm_plugin_build_voices(params->format.format, src_voices,
params->format.format, dst_voices,
&plugin);
if (err < 0) {
snd_pcm_plugin_free(plugin);
return err;
}
err = snd_pcm_plugin_append(pcm, params->channel, plugin);
if (err < 0) {
snd_pcm_plugin_free(plugin);
return err;
}
} else {
return -EINVAL;
}
/*
* formats
*/
if (params->format.format == sparams.format.format)
goto __format_skip;
/* build additional plugins for conversion */
switch (params->format.format) {
case SND_PCM_SFMT_MU_LAW:
srcfmt = SND_PCM_SFMT_MU_LAW;
dstfmt = sparams.format.format;
swap_formats(params->channel, &srcfmt, &dstfmt);
err = snd_pcm_plugin_build_mulaw(srcfmt, dstfmt, &plugin);
break;
default:
srcfmt = params->format.format;
dstfmt = sparams.format.format;
swap_formats(params->channel, &srcfmt, &dstfmt);
err = snd_pcm_plugin_build_linear(srcfmt, dstfmt, &plugin);
}
if (err < 0)
return err;
err = snd_pcm_plugin_insert(pcm, params->channel, plugin);
err = snd_pcm_plugin_append(pcm, params->channel, plugin);
if (err < 0) {
snd_pcm_plugin_free(plugin);
return err;
}
__format_skip:
/*
* rate
*/
if (sparams.format.rate < sinfo.min_rate ||
sparams.format.rate > sinfo.max_rate) {
int src_rate = sparams.format.rate;
int dst_rate = sparams.format.rate < sinfo.min_rate ?
sinfo.min_rate : sinfo.max_rate;
sparams.format.rate = dst_rate;
swap_formats(params->channel, &src_rate, &dst_rate);
err = snd_pcm_plugin_build_rate(sparams.format.format, src_rate, sparams.format.voices,
sparams.format.format, dst_rate, sparams.format.voices,
&plugin);
if (err < 0) {
snd_pcm_plugin_free(plugin);
return err;
}
err = snd_pcm_plugin_append(pcm, params->channel, plugin);
if (err < 0) {
snd_pcm_plugin_free(plugin);
return err;
}
}
/*
* interleave
*/
if (params->format.voices > 1 && sinfo.mode == SND_PCM_MODE_BLOCK) {
int src_interleave, dst_interleave;
@ -409,7 +493,7 @@ int snd_pcm_plugin_params(snd_pcm_t *pcm, snd_pcm_channel_params_t *params)
err = snd_pcm_plugin_build_interleave(src_interleave, dst_interleave, sparams.format.format, &plugin);
if (err < 0)
return err;
err = snd_pcm_plugin_insert(pcm, params->channel, plugin);
err = snd_pcm_plugin_append(pcm, params->channel, plugin);
if (err < 0) {
snd_pcm_plugin_free(plugin);
return err;
@ -417,31 +501,33 @@ int snd_pcm_plugin_params(snd_pcm_t *pcm, snd_pcm_channel_params_t *params)
}
}
if (params->format.format == sparams.format.format)
goto __skip;
/* build additional plugins for conversion */
switch (params->format.format) {
case SND_PCM_SFMT_MU_LAW:
srcfmt = SND_PCM_SFMT_MU_LAW;
dstfmt = sparams.format.format;
swap_formats(params->channel, &srcfmt, &dstfmt);
err = snd_pcm_plugin_build_mulaw(srcfmt, dstfmt, &plugin);
break;
default:
srcfmt = params->format.format;
dstfmt = sparams.format.format;
swap_formats(params->channel, &srcfmt, &dstfmt);
err = snd_pcm_plugin_build_linear(srcfmt, dstfmt, &plugin);
/*
* I/O plugins
*/
if (sinfo.mode == SND_PCM_MODE_STREAM) {
err = snd_pcm_plugin_build_stream(pcm, params->channel, &plugin);
} else if (sinfo.mode == SND_PCM_MODE_BLOCK) {
if (sinfo.flags & SND_PCM_CHNINFO_MMAP) {
err = snd_pcm_plugin_build_mmap(pcm, params->channel, &plugin);
} else {
err = snd_pcm_plugin_build_block(pcm, params->channel, &plugin);
}
} else {
return -EINVAL;
}
if (err < 0)
return err;
err = snd_pcm_plugin_insert(pcm, params->channel, plugin);
err = snd_pcm_plugin_append(pcm, params->channel, plugin);
if (err < 0) {
snd_pcm_plugin_free(plugin);
return err;
}
__skip:
/*
* ratio
*/
ratio = snd_pcm_plugin_hardware_ratio(pcm, params->channel);
if (ratio <= 0)
return -EINVAL;