46 #define C93_HAS_PALETTE 0x01 47 #define C93_FIRST_FRAME 0x02 77 int from_x = offset %
WIDTH;
78 int from_y = offset /
WIDTH;
86 if (from_y + height >
HEIGHT) {
94 for (i = 0; i <
height; i++) {
95 memcpy(&to[i*stride+width], &from[(from_y+i)*stride], overflow);
99 for (i = 0; i <
height; i++) {
100 memcpy(&to[i*stride], &from[(from_y+i)*stride+from_x], width);
110 for (y = 0; y <
height; y++) {
112 cols[0] = grps[3 * (y >> 1)];
113 for (x = 0; x <
width; x++) {
115 cols[1]= grps[(x >> 1) + 1];
116 out[x + y*
stride] = cols[col & ((1 << bpp) - 1)];
126 int buf_size = avpkt->
size;
145 b = bytestream2_get_byte(&gb);
154 for (y = 0; y <
HEIGHT; y += 8) {
156 for (x = 0; x <
WIDTH; x += 8) {
163 bt = bytestream2_get_byte(&gb);
165 block_type= bt & 0x0F;
166 switch (block_type) {
168 offset = bytestream2_get_le16(&gb);
169 if ((ret =
copy_block(avctx, out, copy_from, offset, 8, stride)) < 0)
174 copy_from = newpic->
data[0];
176 for (j = 0; j < 8; j += 4) {
177 for (i = 0; i < 8; i += 4) {
178 int offset = bytestream2_get_le16(&gb);
179 int from_x = offset %
WIDTH;
180 int from_y = offset /
WIDTH;
182 (
FFABS(from_x - x-i) < 4 ||
FFABS(from_x - x-i) > WIDTH-4)) {
186 if ((ret =
copy_block(avctx, &out[j*stride+i],
187 copy_from, offset, 4, stride)) < 0)
195 for (i = 0; i < 8; i++) {
197 NULL, bytestream2_get_byte(&gb));
205 for (j = 0; j < 8; j += 4) {
206 for (i = 0; i < 8; i += 4) {
210 1, cols,
NULL, bytestream2_get_le16(&gb));
214 2, cols,
NULL, bytestream2_get_le32(&gb));
218 1, cols, grps, bytestream2_get_le16(&gb));
228 for (j = 0; j < 8; j++)
243 uint32_t *palette = (uint32_t *) newpic->
data[1];
244 for (i = 0; i < 256; i++) {
245 palette[
i] = 0xFF
U << 24 | bytestream2_get_be24(&gb);
250 memcpy(newpic->
data[1], oldpic->
data[1], 256 * 4);
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
static av_cold int init(AVCodecContext *avctx)
#define avpriv_request_sample(...)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Undefined Behavior In the C some operations are like signed integer overflow
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
static void draw_n_color(uint8_t *out, int stride, int width, int height, int bpp, uint8_t cols[4], uint8_t grps[4], uint32_t col)
static av_cold int decode_init(AVCodecContext *avctx)
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
8 bits with AV_PIX_FMT_RGB32 palette
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int decode_end(AVCodecContext *avctx)
#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.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
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 av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
const char * name
Name of the codec implementation.
enum AVPictureType pict_type
Picture type of the frame.
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x, int delta_y)
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
main external API structure.
int palette_has_changed
Tell user application that palette has changed from previous frame.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
GLint GLenum GLboolean GLsizei stride
common internal api header.
static int copy_block(AVCodecContext *avctx, uint8_t *to, uint8_t *from, int offset, int height, int stride)
int key_frame
1 -> keyframe, 0-> not
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 stores compressed data.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.