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45 unsigned samples_per_block;
66 if (samples_per_block <= 0)
115 int64_t timestamp,
int flags)
120 int samples_per_block;
124 if (samples_per_block > 0)
125 timestamp /= samples_per_block;
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
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
enum AVMediaType codec_type
General type of the encoded data.
This struct describes the properties of an encoded stream.
#define AVERROR_EOF
End of file.
static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
static int vpk_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes)
This function is the same as av_get_audio_frame_duration(), except it works with AVCodecParameters in...
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
int64_t duration
Decoding: duration of the stream, in stream time base.
static int vpk_read_header(AVFormatContext *s)
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
static int read_header(FFV1Context *f)
This structure contains the data a format has to probe a file.
int sample_rate
Audio only.
unsigned int avio_rl32(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
#define MKBETAG(a, b, c, d)
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
static int vpk_probe(const AVProbeData *p)
#define i(width, name, range_min, range_max)
int block_align
Audio only.
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
int64_t pos
byte position in stream, -1 if unknown
#define flags(name, subs,...)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
const AVInputFormat ff_vpk_demuxer