Go to the documentation of this file.
67 const uint8_t *buf = avpkt->
data;
68 int buf_size = avpkt->
size;
70 z_stream *
const zstream = &
c->zstream.zstream;
73 int palette_has_changed = 0;
79 ret = inflateReset(zstream);
84 zstream->next_in = buf;
85 zstream->avail_in = buf_size;
86 zstream->next_out =
c->decomp_buf;
87 zstream->avail_out =
c->decomp_size;
90 if (
ret == Z_DATA_ERROR && !palette_has_changed) {
94 if ((
ret != Z_OK) && (
ret != Z_STREAM_END) && (
ret != Z_DATA_ERROR)) {
102 if (
ret != Z_DATA_ERROR) {
104 c->decomp_size - zstream->avail_out);
110 #if FF_API_PALETTE_HAS_CHANGED
112 frame->palette_has_changed = palette_has_changed;
146 c->decomp_size = (((avctx->
width *
c->bpp + 7) >> 3) + 3 * avctx->
width + 2) * avctx->
height + 2;
149 if (
c->decomp_size) {
150 if (!(
c->decomp_buf =
av_malloc(
c->decomp_size))) {
175 .
p.
name =
"camtasia",
179 .priv_data_size =
sizeof(CamtasiaContext),
#define FF_ENABLE_DEPRECATION_WARNINGS
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
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
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
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.
AVCodec p
The public AVCodec.
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord, int maxc)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define FF_CODEC_DECODE_CB(func)
const FFCodec ff_tscc_decoder
#define CODEC_LONG_NAME(str)
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
static int decode_frame(AVCodecContext *avctx, AVFrame *rframe, int *got_frame, AVPacket *avpkt)
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
int(* init)(AVBSFContext *ctx)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
static av_cold int decode_end(AVCodecContext *avctx)
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
static av_cold int decode_init(AVCodecContext *avctx)
#define AV_PIX_FMT_RGB555
const char * name
Name of the codec implementation.
void ff_inflate_end(FFZStream *zstream)
Wrapper around inflateEnd().
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
#define AV_PIX_FMT_0RGB32
main external API structure.
#define FF_DISABLE_DEPRECATION_WARNINGS
int ff_msrle_decode(AVCodecContext *avctx, AVFrame *pic, int depth, GetByteContext *gb)
Decode stream in MS RLE format into frame.
This structure stores compressed data.
int ff_inflate_init(FFZStream *zstream, void *logctx)
Wrapper around inflateInit().
int width
picture width / height.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
int ff_copy_palette(void *dst, const AVPacket *src, void *logctx)
Check whether the side-data of src contains a palette of size AVPALETTE_SIZE; if so,...
unsigned char * decomp_buf