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48 if (
s1 &&
s1->bit_rate)
49 s->bit_rate =
s1->bit_rate;
60 "Only 6400 and 8000 b/s are supported.",
s->bit_rate);
83 #define OFFSET(x) offsetof(G729DemuxerContext, x)
103 .extensions =
"g729",
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.
#define AV_CHANNEL_LAYOUT_MONO
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
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.
An AVChannelLayout holds information about the channel layout of audio data.
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
int block_align
Audio only.
#define AV_OPT_FLAG_DECODING_PARAM
a generic parameter which can be set by the user for demuxing or decoding
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
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,...)