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lavd/alsa: implement get_device_list callbacks 

Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>
This commit is contained in:
Lukasz Marek 2014-08-26 20:30:35 +02:00
parent 7f7facdeda
commit fe72622819
4 changed files with 66 additions and 0 deletions
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52
libavdevice/alsa-audio-common.c
View File

@ -343,3 +343,55 @@ int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size)
s->reorder_buf_size = size;
return 0;
}
/* ported from alsa-utils/aplay.c */
int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type)
{
int ret = 0;
void **hints, **n;
char *name = NULL, *descr = NULL, *io = NULL, *tmp;
AVDeviceInfo *new_device = NULL;
const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input";
if (snd_device_name_hint(-1, "pcm", &hints) < 0)
return AVERROR_EXTERNAL;
n = hints;
while (*n && !ret) {
name = snd_device_name_get_hint(*n, "NAME");
descr = snd_device_name_get_hint(*n, "DESC");
io = snd_device_name_get_hint(*n, "IOID");
if (!io || !strcmp(io, filter)) {
new_device = av_mallocz(sizeof(AVDeviceInfo));
if (!new_device) {
ret = AVERROR(ENOMEM);
goto fail;
}
new_device->device_name = av_strdup(name);
if ((tmp = strrchr(descr, '\n')) && tmp[1])
new_device->device_description = av_strdup(&tmp[1]);
else
new_device->device_description = av_strdup(descr);
if (!new_device->device_description || !new_device->device_name) {
ret = AVERROR(ENOMEM);
goto fail;
}
if ((ret = av_dynarray_add_nofree(&device_list->devices,
&device_list->nb_devices, new_device)) < 0) {
goto fail;
}
new_device = NULL;
}
fail:
free(io);
free(name);
free(descr);
n++;
}
if (new_device) {
av_free(new_device->device_description);
av_free(new_device->device_name);
av_free(new_device);
}
snd_device_name_free_hint(hints);
return ret;
}

6
libavdevice/alsa-audio-dec.c
View File

@ -132,6 +132,11 @@ static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
return 0;
}
static int audio_get_device_list(AVFormatContext *h, AVDeviceInfoList *device_list)
{
return ff_alsa_get_device_list(device_list, SND_PCM_STREAM_CAPTURE);
}
static const AVOption options[] = {
{ "sample_rate", "", offsetof(AlsaData, sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
{ "channels", "", offsetof(AlsaData, channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
@ -153,6 +158,7 @@ AVInputFormat ff_alsa_demuxer = {
.read_header = audio_read_header,
.read_packet = audio_read_packet,
.read_close = ff_alsa_close,
.get_device_list = audio_get_device_list,
.flags = AVFMT_NOFILE,
.priv_class = &alsa_demuxer_class,
};

6
libavdevice/alsa-audio-enc.c
View File

@ -142,6 +142,11 @@ audio_get_output_timestamp(AVFormatContext *s1, int stream,
*dts = s->timestamp - delay;
}
static int audio_get_device_list(AVFormatContext *h, AVDeviceInfoList *device_list)
{
return ff_alsa_get_device_list(device_list, SND_PCM_STREAM_PLAYBACK);
}
static const AVClass alsa_muxer_class = {
.class_name = "ALSA muxer",
.item_name = av_default_item_name,
@ -159,6 +164,7 @@ AVOutputFormat ff_alsa_muxer = {
.write_packet = audio_write_packet,
.write_trailer = ff_alsa_close,
.write_uncoded_frame = audio_write_frame,
.get_device_list = audio_get_device_list,
.get_output_timestamp = audio_get_output_timestamp,
.flags = AVFMT_NOFILE,
.priv_class = &alsa_muxer_class,

2
libavdevice/alsa-audio.h
View File

@ -99,4 +99,6 @@ int ff_alsa_xrun_recover(AVFormatContext *s1, int err);
int ff_alsa_extend_reorder_buf(AlsaData *s, int size);
int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type);
#endif /* AVDEVICE_ALSA_AUDIO_H */