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27 #define PCM_DEMUX_TARGET_FPS 10
31 int nb_samples, max_samples, bits_per_sample;
48 nb_samples = 1 <<
av_log2(nb_samples);
77 int block_align, byte_rate;
87 if (block_align <= 0 || byte_rate <= 0)
89 if (timestamp < 0) timestamp = 0;
@ AV_ROUND_UP
Round toward +infinity.
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 struct describes the properties of an encoded stream.
int nb_channels
Number of channels in this layout.
int av_get_bits_per_sample(enum AVCodecID codec_id)
Return codec bits per sample.
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
AVCodecParameters * codecpar
Codec parameters associated with this stream.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
AVChannelLayout ch_layout
Audio only.
int sample_rate
Audio only.
@ AV_ROUND_DOWN
Round toward -infinity.
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd)
Rescale a 64-bit integer with specified rounding.
int flags
A combination of AV_PKT_FLAG values.
int block_align
Audio only.
int64_t av_rescale(int64_t a, int64_t b, int64_t c)
Rescale a 64-bit integer with rounding to nearest.
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
This structure stores compressed data.
#define flags(name, subs,...)
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).