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41 #define EXTRADATA1_SIZE (6 + 256 * 3)
64 int base_x = video_base %
s->avctx->width;
65 int base_y = video_base /
s->avctx->width;
66 int stride_adj =
stride -
s->avctx->width;
68 const uint8_t *back_frame =
s->back_frame;
69 const uint8_t *in_end = in +
size;
70 const uint8_t *out_end =
out +
stride *
s->avctx->height;
74 for (
i = 0;
i <= base_y;
i++) {
76 memcpy(
out, back_frame,
s->avctx->width);
78 back_frame +=
s->avctx->width;
80 back_frame += base_x -
s->avctx->width;
81 line_end =
out - stride_adj;
105 *
out++ = (
val == 0x80) ? *back_frame :
val;
107 if (
out == line_end) {
118 while (
out < out_end) {
119 memcpy(
out, back_frame, line_end -
out);
120 back_frame += line_end -
out;
121 out = line_end + stride_adj;
174 back_frame, avctx->
width, 0);
175 s->back_frame = back_frame;
184 const uint8_t *buf = avpkt->
data;
185 int ret, buf_size = avpkt->
size;
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 describes decoded (raw) audio or video data.
uint32_t clr_count
number of used colors (currently unused)
uint8_t * back_frame
background frame
AVCodec p
The public AVCodec.
static double val(void *priv, double ch)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define FF_CODEC_DECODE_CB(func)
static int rl2_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
const FFCodec ff_rl2_decoder
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.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
static av_cold int rl2_decode_init(AVCodecContext *avctx)
Initialize the decoder.
#define i(width, name, range_min, range_max)
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
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
static av_cold int rl2_decode_end(AVCodecContext *avctx)
Uninit decoder.
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
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
main external API structure.
static void rl2_rle_decode(Rl2Context *s, const uint8_t *in, int size, uint8_t *out, int stride, int video_base)
Run Length Decode a single 320x200 frame.
uint16_t video_base
initial drawing offset
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.
#define EXTRADATA1_SIZE
video base, clr count, palette
This structure stores compressed data.
int width
picture width / height.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
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_RB24
uint32_t palette[AVPALETTE_COUNT]