30 #include <sys/ioctl.h> 31 #include <sys/soundcard.h> 75 struct audio_buf_info abufi;
84 if (ret<0)
return AVERROR(errno);
92 if (ioctl(s->
fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) {
93 bdelay += abufi.bytes;
103 short *p = (
short *) pkt->
data;
105 for (i = 0; i <
ret; i += 4) {
143 .priv_class = &oss_demuxer_class,
#define LIBAVUTIL_VERSION_INT
static const AVOption options[]
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
const char * av_default_item_name(void *ptr)
Return the context name.
static 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...
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
#define AVERROR_EOF
End of file.
static av_cold int read_close(AVFormatContext *ctx)
int ff_oss_audio_open(AVFormatContext *s1, int is_output, const char *audio_device)
Main libavdevice API header.
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
char * url
input or output URL.
enum AVMediaType codec_type
General type of the encoded data.
static int audio_read_close(AVFormatContext *s1)
static int audio_read_packet(AVFormatContext *s1, AVPacket *pkt)
common internal API header
static int read_header(FFV1Context *f)
int64_t av_gettime(void)
Get the current time in microseconds.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
static const AVClass oss_demuxer_class
Libavcodec external API header.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Describe the class of an AVClass context structure.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
#define flags(name, subs,...)
int sample_rate
Audio only.
int ff_oss_audio_close(OSSAudioData *s)
void * priv_data
Format private data.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
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
This structure stores compressed data.
AVInputFormat ff_oss_demuxer
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...