55 int buf_size = avpkt->
size;
77 pal = (uint32_t *)frame->
data[1];
81 for (j = 0; j < 3; j++, shift -= 8)
82 *pal += ((avctx->
extradata[i * 3 + j] << 2) |
86 memcpy(bfi->
pal, frame->
data[1],
sizeof(bfi->
pal));
92 memcpy(frame->
data[1], bfi->
pal,
sizeof(bfi->
pal));
97 while (dst != frame_end) {
98 static const uint8_t lentab[4] = { 0, 2, 0, 1 };
100 unsigned int code = byte >> 6;
101 unsigned int length = byte & ~0xC0;
105 "Input resolution larger than actual frame.\n");
112 length = bytestream2_get_byte(&g);
113 offset = bytestream2_get_le16(&g);
115 length = bytestream2_get_le16(&g);
116 if (code == 2 && length == 0)
121 offset = bytestream2_get_byte(&g);
125 if (dst + (length << lentab[code]) > frame_end)
138 dst_offset = dst -
offset;
140 if (dst_offset < bfi->dst)
143 *dst++ = *dst_offset++;
149 colour1 = bytestream2_get_byte(&g);
150 colour2 = bytestream2_get_byte(&g);
160 dst = frame->
data[0];
162 memcpy(dst, src, avctx->
width);
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static int shift(int a, int b)
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static av_cold int init(AVCodecContext *avctx)
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)
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
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
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
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
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.
static void frame_end(MpegEncContext *s)
enum AVPictureType pict_type
Picture type of the frame.
static av_cold int bfi_decode_close(AVCodecContext *avctx)
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
Libavcodec external API header.
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_WB16 unsigned int_TMPL byte
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
static av_cold int bfi_decode_init(AVCodecContext *avctx)
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.
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
common internal api header.
common internal and external API header
static int bfi_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
int key_frame
1 -> keyframe, 0-> not
int frame_number
Frame counter, set by libavcodec.
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.