56 #if FF_API_CHILD_CLASS_NEXT 97 .log_level_offset_offset = offsetof(
AVCodecContext, log_level_offset),
99 #if FF_API_CHILD_CLASS_NEXT 100 .child_class_next = codec_child_class_next,
165 #if FF_API_GET_CONTEXT_DEFAULTS 205 #if FF_API_COPY_CONTEXT 211 #if FF_API_CODED_FRAME 238 "Tried to copy AVCodecContext %p into already-initialized %p\n",
245 memcpy(dest, src,
sizeof(*dest));
249 dest->
codec = orig_codec;
260 #if FF_API_CODED_FRAME 277 #define alloc_and_copy_or_fail(obj, size, pad) \ 278 if (src->obj && size > 0) { \ 279 dest->obj = av_malloc(size + pad); \ 282 memcpy(dest->obj, src->obj, size); \ 284 memset(((uint8_t *) dest->obj) + size, 0, pad); \ 294 #undef alloc_and_copy_or_fail 315 #define FOFFSET(x) offsetof(AVFrame,x) 330 #if FF_API_COPY_CONTEXT 344 #define SROFFSET(x) offsetof(AVSubtitleRect,x) 357 #if FF_API_COPY_CONTEXT enum AVPixelFormat(* get_format)(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
callback to negotiate the pixelFormat
const struct AVCodec * codec
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
int avcodec_default_execute2(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2, int, int), void *arg, int *ret, int count)
#define AV_OPT_FLAG_SUBTITLE_PARAM
#define LIBAVUTIL_VERSION_INT
Memory handling functions.
void av_opt_set_defaults(void *s)
Set the values of all AVOption fields to their default values.
#define AV_OPT_FLAG_AUDIO_PARAM
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
static const AVOption avcodec_options[]
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
const struct AVHWAccel * hwaccel
Hardware accelerator in use.
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 format(the sample packing is implied by the sample format) and sample rate.The lists are not just lists
const AVCodec * av_codec_iterate(void **opaque)
Iterate over all registered codecs.
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
static void copy_context_reset(AVCodecContext *avctx)
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
static const AVClass av_codec_context_class
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
#define av_assert0(cond)
assert() equivalent, that is always enabled.
static int init_context_defaults(AVCodecContext *s, const AVCodec *codec)
enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat *fmt)
enum AVSampleFormat sample_fmt
audio sample format
static const AVOption subtitle_rect_options[]
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
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
const AVClass * av_class
information on struct for av_log
static const AVClass av_subtitle_rect_class
const AVClass * avcodec_get_frame_class(void)
Get the AVClass for AVFrame.
int avcodec_close(AVCodecContext *avctx)
Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext its...
AVRational pkt_timebase
Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
const AVCodecDefault * defaults
Private codec-specific defaults.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
int avcodec_is_open(AVCodecContext *s)
static void * codec_child_next(void *obj, void *prev)
simple assert() macros that are a bit more flexible than ISO C assert().
const char * name
Name of the codec implementation.
AVClassCategory category
Category used for visualization (like color) This is only set if the category is equal for all object...
common internal API header
int rc_override_count
ratecontrol override, see RcOverride
AVPacketSideData * coded_side_data
Additional data associated with the entire coded stream.
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
Copy the settings of the source AVCodecContext into the destination AVCodecContext.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
static const AVClass * codec_child_class_iterate(void **iter)
AVBufferRef * hw_frames_ctx
A reference to the AVHWFramesContext describing the input (for encoding) or output (decoding) frames...
const AVClass * avcodec_get_subtitle_rect_class(void)
Get the AVClass for AVSubtitleRect.
void av_opt_set_defaults2(void *s, int mask, int flags)
Set the values of all AVOption fields to their default values.
int64_t reordered_opaque
opaque 64-bit number (generally a PTS) that will be reordered and output in AVFrame.reordered_opaque
Usually treated as AVMEDIA_TYPE_DATA.
int(* execute2)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count)
The codec may call this to execute several independent things.
int(* decode)(struct AVCodecContext *, void *outdata, int *outdata_size, struct AVPacket *avpkt)
int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags)
The default callback for AVCodecContext.get_buffer2().
Libavcodec external API header.
enum AVMediaType codec_type
void avcodec_free_context(AVCodecContext **pavctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
#define AV_OPT_FLAG_VIDEO_PARAM
main external API structure.
uint16_t * intra_matrix
custom intra quantization matrix Must be allocated with the av_malloc() family of functions...
Describe the class of an AVClass context structure.
int(* get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags)
This callback is called at the beginning of each frame to get data buffer(s) for it.
Rational number (pair of numerator and denominator).
uint16_t * inter_matrix
custom inter quantization matrix Must be allocated with the av_malloc() family of functions...
#define flags(name, subs,...)
const AVClass * priv_class
AVClass for the private context.
void av_opt_free(void *obj)
Free all allocated objects in obj.
static const AVOption frame_options[]
#define FF_DISABLE_DEPRECATION_WARNINGS
common internal api header.
AVBufferRef * av_buffer_ref(AVBufferRef *buf)
Create a new reference to an AVBuffer.
int av_opt_copy(void *dst, const void *src)
Copy options from src object into dest object.
static AVClassCategory get_category(void *ptr)
attribute_deprecated AVFrame * coded_frame
the picture in the bitstream
static const AVClass av_frame_class
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
#define FF_ENABLE_DEPRECATION_WARNINGS
#define alloc_and_copy_or_fail(obj, size, pad)
struct AVCodecInternal * internal
Private context used for internal data.
FF_DISABLE_DEPRECATION_WARNINGS static FF_ENABLE_DEPRECATION_WARNINGS const char * context_to_name(void *ptr)
int * slice_offset
slice offsets in the frame in bytes
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
AVBufferRef * hw_device_ctx
A reference to the AVHWDeviceContext describing the device which will be used by a hardware encoder/d...
int(* execute)(struct AVCodecContext *c, int(*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size)
The codec may call this to execute several independent things.
int av_opt_set(void *obj, const char *name, const char *val, int search_flags)
enum AVPixelFormat sw_pix_fmt
Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
#define AV_NOPTS_VALUE
Undefined timestamp value.
int avcodec_default_execute(AVCodecContext *c, int(*func)(AVCodecContext *c2, void *arg2), void *arg, int *ret, int count, int size)
uint8_t * subtitle_header
Header containing style information for text subtitles.