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);
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);
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);
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
static av_always_inline int bytestream2_tell(GetByteContext *g)
#define flags(name, subs,...)
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.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
#define AVERROR_EXTERNAL
Generic error in an external library.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
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.
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.
@ AV_PICTURE_TYPE_I
Intra.
@ AV_PICTURE_TYPE_P
Predicted.
#define FF_REGET_BUFFER_FLAG_READONLY
the returned buffer does not need to be writable
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
@ AV_PIX_FMT_BGRA
packed BGRA 8:8:8:8, 32bpp, BGRABGRA...
@ AV_PIX_FMT_RGB565LE
packed RGB 5:6:5, 16bpp, (msb) 5R 6G 5B(lsb), little-endian
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
main external API structure.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
int width
picture width / height.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
int frame_number
Frame counter, set by libavcodec.
const char * name
Name of the codec implementation.
This structure describes decoded (raw) audio or video data.
This structure stores compressed data.
uint8_t block_data[65536 *8]
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord, int maxc)
static av_cold int decode_close(AVCodecContext *avctx)
static av_cold int decode_init(AVCodecContext *avctx)
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)