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57 const uint8_t *buf = avpkt->
data;
58 int buf_size = avpkt->
size;
60 const unsigned char *encoded = buf;
61 unsigned char *pixptr, *pixptr_end;
63 unsigned int dlen, p, row;
64 const unsigned char *lp, *dp, *ep;
67 unsigned int planes =
c->planes;
68 unsigned char *planemap =
c->planemap;
77 ep = encoded + buf_size;
84 for (p = 0; p <
planes; p++) {
86 lp = encoded + p * (
height << 1);
89 for (row = 0; row <
height; row++) {
90 pixptr =
frame->data[0] + row *
frame->linesize[0] + planemap[p];
91 pixptr_end = pixptr +
frame->linesize[0];
92 if (ep - lp < row * 2 + 2)
94 dlen =
av_be2ne16(*(
const unsigned short *)(lp + row * 2));
99 if ((count = *dp++) <= 127) {
102 if (pixptr_end - pixptr < count * px_inc)
112 if (pixptr_end - pixptr < count * px_inc)
168 c->planemap[0] = HAVE_BIGENDIAN ? 1 : 2;
169 c->planemap[1] = HAVE_BIGENDIAN ? 2 : 1;
170 c->planemap[2] = HAVE_BIGENDIAN ? 3 : 0;
171 c->planemap[3] = HAVE_BIGENDIAN ? 0 : 3;
unsigned char planemap[4]
AVPixelFormat
Pixel format.
static enum AVPixelFormat pixfmt_rgb24[]
static const struct @346 planes[]
int ff_get_format(AVCodecContext *avctx, const enum AVPixelFormat *fmt)
Select the (possibly hardware accelerated) pixel format.
static av_cold int decode_init(AVCodecContext *avctx)
This structure describes decoded (raw) audio or video data.
@ AV_PIX_FMT_BGR24
packed RGB 8:8:8, 24bpp, BGRBGR...
AVCodec p
The public AVCodec.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
const FFCodec ff_eightbps_decoder
#define FF_CODEC_DECODE_CB(func)
int(* init)(AVBSFContext *ctx)
#define CODEC_LONG_NAME(str)
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 ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
const char * name
Name of the codec implementation.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
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.
static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
This structure stores compressed data.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
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,...