48 #include <alsa/asoundlib.h>
90 s->period_size, 1.5E-6);
106 snd_pcm_sframes_t delay = 0;
116 while ((res = snd_pcm_readi(
s->h,
s->pkt->data +
s->pkt->size,
s->period_size -
s->pkt->size /
s->frame_size)) < 0) {
117 if (res == -EAGAIN) {
128 s->pkt->size += res *
s->frame_size;
129 }
while (
s->pkt->size <
s->period_size *
s->frame_size);
133 snd_pcm_delay(
s->h, &delay);
134 dts -=
av_rescale(delay + res, 1000000,
s->sample_rate);
136 s->last_period = res;
int ff_alsa_xrun_recover(AVFormatContext *s1, int err)
Try to recover from ALSA buffer underrun.
int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type)
av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode, unsigned int *sample_rate, int channels, enum AVCodecID *codec_id)
Open an ALSA PCM.
av_cold int ff_alsa_close(AVFormatContext *s1)
Close the ALSA PCM.
ALSA input and output: definitions and structures.
static av_cold int audio_read_header(AVFormatContext *s1)
static const AVOption options[]
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
AVInputFormat ff_alsa_demuxer
static const AVClass alsa_demuxer_class
static int audio_get_device_list(AVFormatContext *h, AVDeviceInfoList *device_list)
Main libavdevice API header.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
#define flags(name, subs,...)
static int read_header(FFV1Context *f)
AVCodecID
Identify the syntax and semantics of the bitstream.
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
const char * av_default_item_name(void *ptr)
Return the context name.
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
#define LIBAVUTIL_VERSION_INT
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static av_cold int read_close(AVFormatContext *ctx)
@ AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
Describe the class of an AVClass context structure.
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
int frame_size
Audio only.
enum AVMediaType codec_type
General type of the encoded data.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
int sample_rate
Audio only.
This structure stores compressed data.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
AVCodecParameters * codecpar
Codec parameters associated with this stream.
int64_t av_gettime(void)
Get the current time in microseconds.
double ff_timefilter_update(TimeFilter *self, double system_time, double period)
Update the filter.
TimeFilter * ff_timefilter_new(double time_base, double period, double bandwidth)
Create a new Delay Locked Loop time filter.
void ff_timefilter_reset(TimeFilter *self)
Reset the filter.