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66 const AVFrame *p,
int *got_packet)
71 int max_size = deflateBound(&
c->zstream, avctx->
width * avctx->
height * 3);
81 zret = deflateReset(&
c->zstream);
91 c->zstream.avail_in = avctx->
width*3;
92 zret =
deflate(&
c->zstream, Z_NO_FLUSH);
98 zret =
deflate(&
c->zstream, Z_FINISH);
99 if (zret != Z_STREAM_END) {
124 #if FF_API_CODED_FRAME
146 c->avctx->extradata_size= 8;
148 c->zstream.zalloc = Z_NULL;
149 c->zstream.zfree = Z_NULL;
150 c->zstream.opaque = Z_NULL;
151 zret = deflateInit(&
c->zstream,
c->compression);
165 deflateEnd(&
c->zstream);
#define AV_CODEC_CAP_INTRA_ONLY
Codec is intra only.
#define FF_ENABLE_DEPRECATION_WARNINGS
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
AVPixelFormat
Pixel format.
static av_cold int init(AVCodecContext *avctx)
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 describes decoded (raw) audio or video data.
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
#define FF_COMPRESSION_DEFAULT
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
int key_frame
1 -> keyframe, 0-> not
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define av_assert0(cond)
assert() equivalent, that is always enabled.
static enum AVPixelFormat pix_fmts[]
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
@ AV_PICTURE_TYPE_I
Intra.
static void deflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord, int maxc)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
enum AVPictureType pict_type
Picture type of the frame.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int flags
A combination of AV_PKT_FLAG values.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
#define i(width, name, range_min, range_max)
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
const char * name
Name of the codec implementation.
static av_cold int encode_end(AVCodecContext *avctx)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
#define AV_INPUT_BUFFER_PADDING_SIZE
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
main external API structure.
#define FF_DISABLE_DEPRECATION_WARNINGS
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet)
static av_cold int encode_init(AVCodecContext *avctx)
This structure stores compressed data.
int width
picture width / height.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
int ff_alloc_packet2(AVCodecContext *avctx, AVPacket *avpkt, int64_t size, int64_t min_size)
Check AVPacket size and/or allocate data.