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70 if (
ret == 0 || sio_eof(
s->hdl)) {
81 bdelay =
ret +
s->hwpos -
s->softpos;
84 pkt->
pts = cur_time - ((bdelay * 1000000) /
85 (
s->bps *
s->channels *
s->sample_rate));
static av_cold int audio_read_close(AVFormatContext *s1)
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
enum AVMediaType codec_type
General type of the encoded data.
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
av_cold int ff_sndio_open(AVFormatContext *s1, int is_output, const char *audio_device)
int nb_channels
Number of channels in this layout.
const FFInputFormat ff_sndio_demuxer
static const AVClass sndio_demuxer_class
static av_cold int read_close(AVFormatContext *ctx)
@ AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
#define LIBAVUTIL_VERSION_INT
static int read_header(FFV1Context *f)
Describe the class of an AVClass context structure.
const char * av_default_item_name(void *ptr)
Return the context name.
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
char * url
input or output URL.
int ff_sndio_close(SndioData *s)
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
static av_cold int audio_read_header(AVFormatContext *s1)
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
@ AV_OPT_TYPE_INT
Underlying C type is int.
int64_t av_gettime(void)
Get the current time in microseconds.
static const AVOption options[]
#define AV_OPT_FLAG_DECODING_PARAM
A generic parameter which can be set by the user for demuxing or decoding.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
void * priv_data
Format private data.