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*参照元 [#tb5607fa] #backlinks *説明 [#p79b0c7e] -パス: [[linux-2.6.33/]] -パス: [[alsa-lib-1.0.27.2/src/pcm/pcm_hw.c]] -FIXME: これは何？ --説明 **引数 [#f0d2a886] -snd_pcm_t **pcmp -- --[[alsa-lib-1.0.27.2/snd_pcm_t]] -const char *name -- -snd_config_t *root ATTRIBUTE_UNUSED -- --[[alsa-lib-1.0.27.2/snd_config_t]] -- --[[alsa-lib-1.0.27.2/ATTRIBUTE_UNUSED]] -snd_config_t *conf -- -snd_pcm_stream_t stream -- --[[alsa-lib-1.0.27.2/snd_pcm_stream_t]] -int mode -- **返り値 [#yaa8e4ce] -int -- **参考 [#k1514eaa] *実装 [#y798613a] /** * \brief Creates a new hw PCM * \param pcmp Returns created PCM handle * \param name Name of PCM * \param root Root configuration node * \param conf Configuration node with hw PCM description * \param stream PCM Stream * \param mode PCM Mode * \warning Using of this function might be dangerous in the sense * of compatibility reasons. The prototype might be freely * changed in future. */ int _snd_pcm_hw_open(snd_pcm_t **pcmp, const char *name, snd_config_t *root ATTRIBUTE_UNUSED, snd_config_t *conf, snd_pcm_stream_t stream, int mode) { snd_config_iterator_t i, next; long card = -1, device = 0, subdevice = -1; const char *str; int err, sync_ptr_ioctl = 0; int rate = 0, channels = 0; snd_pcm_format_t format = SND_PCM_FORMAT_UNKNOWN; snd_config_t *n; int nonblock = 1; /* non-block per default */ snd_pcm_chmap_query_t **chmap = NULL; snd_pcm_hw_t *hw; - --[[alsa-lib-1.0.27.2/snd_config_iterator_t]] - --[[alsa-lib-1.0.27.2/snd_pcm_format_t]] - --[[alsa-lib-1.0.27.2/snd_pcm_chmap_query_t]] - --[[alsa-lib-1.0.27.2/snd_pcm_hw_t]] /* look for defaults.pcm.nonblock definition */ if (snd_config_search(root, "defaults.pcm.nonblock", &n) >= 0) { err = snd_config_get_bool(n); if (err >= 0) nonblock = err; } - --[[alsa-lib-1.0.27.2/snd_config_search()]] - --[[alsa-lib-1.0.27.2/snd_config_get_bool()]] snd_config_for_each(i, next, conf) { const char *id; n = snd_config_iterator_entry(i); if (snd_config_get_id(n, &id) < 0) continue; if (snd_pcm_conf_generic_id(id)) continue; - --[[alsa-lib-1.0.27.2/snd_config_for_each()]] - --[[alsa-lib-1.0.27.2/snd_config_iterator_entry()]] - --[[alsa-lib-1.0.27.2/snd_config_get_id()]] - --[[alsa-lib-1.0.27.2/snd_pcm_conf_generic_id()]] if (strcmp(id, "card") == 0) { err = snd_config_get_integer(n, &card); if (err < 0) { err = snd_config_get_string(n, &str); if (err < 0) { SNDERR("Invalid type for %s", id); return -EINVAL; } card = snd_card_get_index(str); if (card < 0) { SNDERR("Invalid value for %s", id); return card; } } continue; } - --[[alsa-lib-1.0.27.2/snd_config_get_integer()]] - --[[alsa-lib-1.0.27.2/snd_config_get_string()]] - --[[alsa-lib-1.0.27.2/snd_card_get_index()]] - --[[alsa-lib-1.0.27.2/SNDERR()]] if (strcmp(id, "device") == 0) { err = snd_config_get_integer(n, &device); if (err < 0) { SNDERR("Invalid type for %s", id); return err; } continue; } - --[[alsa-lib-1.0.27.2/snd_config_get_integer()]] if (strcmp(id, "subdevice") == 0) { err = snd_config_get_integer(n, &subdevice); if (err < 0) { SNDERR("Invalid type for %s", id); return err; } continue; } - --[[alsa-lib-1.0.27.2/snd_config_get_integer()]] if (strcmp(id, "sync_ptr_ioctl") == 0) { err = snd_config_get_bool(n); if (err < 0) continue; sync_ptr_ioctl = err; continue; } - --[[alsa-lib-1.0.27.2/snd_config_get_bol()]] if (strcmp(id, "nonblock") == 0) { err = snd_config_get_bool(n); if (err < 0) continue; nonblock = err; continue; } - --[[alsa-lib-1.0.27.2/snd_config_get_bool()]] if (strcmp(id, "rate") == 0) { long val; err = snd_config_get_integer(n, &val); if (err < 0) { SNDERR("Invalid type for %s", id); return err; } rate = val; continue; } - --[[alsa-lib-1.0.27.2/snd_config_get_integer()]] if (strcmp(id, "format") == 0) { err = snd_config_get_string(n, &str); if (err < 0) { SNDERR("invalid type for %s", id); return err; } format = snd_pcm_format_value(str); continue; } - --[[alsa-lib-1.0.27.2/snd_config_get_string()]] - --[[alsa-lib-1.0.27.2/snd_pcm_format_value()]] if (strcmp(id, "channels") == 0) { long val; err = snd_config_get_integer(n, &val); if (err < 0) { SNDERR("Invalid type for %s", id); return err; } channels = val; continue; } - --[[alsa-lib-1.0.27.2/snd_config_get_integer()]] if (strcmp(id, "chmap") == 0) { snd_pcm_free_chmaps(chmap); chmap = _snd_pcm_parse_config_chmaps(n); if (!chmap) { SNDERR("Invalid channel map for %s", id); return -EINVAL; } continue; } - --[[alsa-lib-1.0.27.2/snd_pcm_free_chmaps()]] - --[[alsa-lib-1.0.27.2/_snd_pcm_parse_config_chmaps()]] SNDERR("Unknown field %s", id); snd_pcm_free_chmaps(chmap); return -EINVAL; - --[[alsa-lib-1.0.27.2/snd_pcm_free_chmaps()]] } if (card < 0) { SNDERR("card is not defined"); snd_pcm_free_chmaps(chmap); return -EINVAL; } err = snd_pcm_hw_open(pcmp, name, card, device, subdevice, stream, mode | (nonblock ? SND_PCM_NONBLOCK : 0), 0, sync_ptr_ioctl); - --[[alsa-lib-1.0.27.2/snd_pcm_hw_open()]] - --[[alsa-lib-1.0.27.2/SND_PCM_NONBLOCK]] if (err < 0) { snd_pcm_free_chmaps(chmap); return err; } if (nonblock && ! (mode & SND_PCM_NONBLOCK)) { /* revert to blocking mode for read/write access */ snd_pcm_hw_nonblock(*pcmp, 0); (*pcmp)->mode = mode; - --[[alsa-lib-1.0.27.2/snd_pcm_hw_nonblock()]] } else /* make sure the SND_PCM_NO_xxx flags don't get lost on the * way */ (*pcmp)->mode |= mode & (SND_PCM_NO_AUTO_RESAMPLE| SND_PCM_NO_AUTO_CHANNELS| SND_PCM_NO_AUTO_FORMAT| SND_PCM_NO_SOFTVOL); - --[[alsa-lib-1.0.27.2/SND_PCM_NO_AUTO_RESAMPLE]] - --[[alsa-lib-1.0.27.2/SND_PCM_NO_AUTO_CHANNELS]] - --[[alsa-lib-1.0.27.2/SND_PCM_NO_AUTO_FORMAT]] - --[[alsa-lib-1.0.27.2/SND_PCM_NO_SOFTVOL]] hw = (*pcmp)->private_data; if (format != SND_PCM_FORMAT_UNKNOWN) hw->format = format; if (channels > 0) hw->channels = channels; if (rate > 0) hw->rate = rate; if (chmap) hw->chmap_override = chmap; - --[[alsa-lib-1.0.27.2/SND_PCM_FORMAT_UNKNOWN]] return 0; } *コメント [#m52b5c4d]
