int snd_pcm_plugin_build_route(struct snd_pcm_substream *plug,
struct snd_pcm_plugin_format *src_format,
struct snd_pcm_plugin_format *dst_format,
struct snd_pcm_plugin **r_plugin)
{
struct snd_pcm_plugin *plugin;
int err;
if (snd_BUG_ON(!r_plugin))
return -ENXIO;
*r_plugin = NULL;
if (snd_BUG_ON(src_format->rate != dst_format->rate))
return -ENXIO;
if (snd_BUG_ON(src_format->format != dst_format->format))
return -ENXIO;
err = snd_pcm_plugin_build(plug, "route conversion",
《浅析alsa声卡驱动snd_pcm_plugin_build函数》 src_format, dst_format, 0, &plugin);
if (err < 0)
return err;
plugin->transfer = route_transfer;
《浅析alsa声卡驱动route_transfer函数》 *r_plugin = plugin;
return 0;
}
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