Go to the documentation of this file.
43 void *
data,
int *got_frame,
48 int skip, blocks, zret,
ret, intra = 0,
flags = 0, bpp =
s->bpp;
52 ret = inflateReset(&
s->zstream);
59 blocks = bytestream2_get_le16(&gb);
70 if (blocks * 8 >= 0xFFFF)
71 size = bytestream2_get_le24(&gb);
72 else if (blocks * 8 >= 0xFF)
73 size = bytestream2_get_le16(&gb);
75 size = bytestream2_get_byte(&gb);
81 s->zstream.next_in = avpkt->
data + skip;
82 s->zstream.avail_in =
size;
83 s->zstream.next_out =
s->block_data;
84 s->zstream.avail_out =
sizeof(
s->block_data);
86 zret =
inflate(&
s->zstream, Z_FINISH);
87 if (zret != Z_STREAM_END) {
89 "Inflate failed with return code: %d.\n", zret);
93 ret = inflateReset(&
s->zstream);
102 for (
int i = 0;
i < blocks;
i++) {
106 w = bytestream2_get_le16(&bgb);
107 h = bytestream2_get_le16(&bgb);
108 if (x + bpp * (int64_t)
w *
h > INT_MAX)
122 s->zstream.next_in = avpkt->
data + skip;
123 s->zstream.avail_in = avpkt->
size - skip;
131 for (
int i = 0;
i < blocks;
i++) {
135 w = bytestream2_get_le16(&gb);
136 h = bytestream2_get_le16(&gb);
137 if (x + bpp * (int64_t)
w *
h > INT_MAX)
151 s->zstream.next_in = avpkt->
data + skip;
152 s->zstream.avail_in = avpkt->
size - skip;
161 ptrdiff_t linesize[4] = {
s->prev_frame->linesize[0], 0, 0, 0 };
169 x = bytestream2_get_le16(&gb);
170 y = bytestream2_get_le16(&gb);
171 w = bytestream2_get_le16(&gb);
172 h = bytestream2_get_le16(&gb);
174 if (blocks == 1 && x == 0 && y == 0 &&
w == avctx->
width &&
h == avctx->
height)
183 dst =
s->prev_frame->data[0] + (avctx->
height - y - 1) *
s->prev_frame->linesize[0] + x * bpp;
185 s->zstream.next_out = dst;
186 s->zstream.avail_out =
w * bpp;
188 zret =
inflate(&
s->zstream, Z_SYNC_FLUSH);
189 if (zret != Z_OK && zret != Z_STREAM_END) {
191 "Inflate failed with return code: %d.\n", zret);
195 dst -=
s->prev_frame->linesize[0];
199 s->prev_frame->key_frame = intra;
226 s->zstream.zalloc = Z_NULL;
227 s->zstream.zfree = Z_NULL;
228 s->zstream.opaque = Z_NULL;
229 zret = inflateInit(&
s->zstream);
247 inflateEnd(&
s->zstream);
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
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
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
This structure describes decoded (raw) audio or video data.
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
@ AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
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.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
uint8_t block_data[65536 *8]
@ AV_PIX_FMT_RGB565LE
packed RGB 5:6:5, 16bpp, (msb) 5R 6G 5B(lsb), little-endian
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
@ AV_PICTURE_TYPE_I
Intra.
int av_image_fill_black(uint8_t *dst_data[4], const ptrdiff_t dst_linesize[4], enum AVPixelFormat pix_fmt, enum AVColorRange range, int width, int height)
Overwrite the image data with black.
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
static av_always_inline int bytestream2_tell(GetByteContext *g)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
#define AVERROR_EXTERNAL
Generic error in an external library.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
#define i(width, name, range_min, range_max)
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
const AVCodec ff_wcmv_decoder
const char * name
Name of the codec implementation.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
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 FF_REGET_BUFFER_FLAG_READONLY
the returned buffer does not need to be writable
main external API structure.
@ AV_PICTURE_TYPE_P
Predicted.
int frame_number
Frame counter, set by libavcodec.
This structure stores compressed data.
int width
picture width / height.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
#define flags(name, subs,...)
The exact code depends on how similar the blocks are and how related they are to the block
static av_cold int decode_close(AVCodecContext *avctx)
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static av_cold int decode_init(AVCodecContext *avctx)