55 #define HUFFMAN_TABLE_SIZE 64 * 1024 56 #define HUF_TOKENS 256 57 #define PALETTE_COUNT 256 69 const unsigned char *
buf;
73 int num_huff_nodes[256];
90 for(i = 0; i < num_hnodes; i++) {
95 if(hnodes[i].count < best) {
103 hnodes[best_node].
used = 1;
117 hnode *node, *hnodes;
126 node = &hnodes[num_hnodes];
149 int i, j, histogram_index = 0;
150 unsigned char *histograms;
163 for (i = 0; i < 256; i++) {
178 int bit_pos, node_num, dat_pos;
180 prev = bit_pos = dat_pos = 0;
189 if(dat_pos >= s->
size) {
194 v = s->
buf[dat_pos++];
197 node_num = hnodes[node_num].
children[v & 0x01];
202 frame->
data[0][x] = node_num;
211 void *
data,
int *got_frame,
215 int buf_size = avpkt->
size;
247 {
"max_pixels",
"320*240" },
252 .
name =
"idcinvideo",
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static av_cold int init(AVCodecContext *avctx)
static int idcin_decode_vlcs(IdcinContext *s, AVFrame *frame)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
8 bits with AV_PIX_FMT_RGB32 palette
static const AVCodecDefault idcin_defaults[]
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
hnode huff_nodes[256][HUF_TOKENS *2]
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE bytes worth of palette...
static int huff_smallest_node(hnode *hnodes, int num_hnodes)
Find the lowest probability node in a Huffman table, and mark it as being assigned to a higher probab...
uint8_t * av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
#define HUFFMAN_TABLE_SIZE
const char * name
Name of the codec implementation.
static const AVCodecDefault defaults[]
common internal API header
int width
picture width / height.
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
static av_cold void huff_build_tree(IdcinContext *s, int prev)
const unsigned char * buf
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
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.
common internal api header.
static av_cold int idcin_decode_init(AVCodecContext *avctx)
static int idcin_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
This structure stores compressed data.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.