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25 #define HEADER_SIZE 24
48 if (bytestream_get_le16(&bytestream) !=
HEADER_SIZE)
50 width = bytestream_get_le16(&bytestream);
51 height = bytestream_get_le16(&bytestream);
57 fourcc = bytestream_get_le32(&bytestream);
107 uint32_t
size, timestamp;
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 MKTAG(a, b, c, d)
static int msnwc_tcp_read_packet(AVFormatContext *ctx, AVPacket *pkt)
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
int buf_size
Size of buf except extra allocated bytes.
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
unsigned int avio_rl16(AVIOContext *s)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
AVInputFormat ff_msnwc_tcp_demuxer
AVCodecParameters * codecpar
Codec parameters associated with this stream.
AVIOContext * pb
I/O context.
This structure contains the data a format has to probe a file.
unsigned int avio_rl32(AVIOContext *s)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
int avio_r8(AVIOContext *s)
int flags
A combination of AV_PKT_FLAG values.
#define i(width, name, range_min, range_max)
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
static int msnwc_tcp_read_header(AVFormatContext *ctx)
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.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static int msnwc_tcp_probe(const AVProbeData *p)
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.