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30 #define FRAME_HEADER_SIZE 64
33 #define SUBSAMPLE_420 0
34 #define SUBSAMPLE_422 1
35 #define YUVORDER_YUYV 0
36 #define YUVORDER_UYVY 1
37 #define NOT_COMPRESSED 0
39 #define NO_DECIMATION 0
40 #define DECIMATION_ENAB 1
63 uint8_t *y, *
u, *v, *y_end, *u_end, *v_end;
109 i++,
src += linelength, src_size -= linelength
116 if (src_size < linelength) {
121 if (
src[linelength - 1] !=
EOL) {
123 av_log(avctx,
AV_LOG_WARNING,
"Wrong line length %d or line not terminated properly (found 0x%02x)!\n", linelength,
src[linelength - 1]);
132 v = &
frame->data[2][(
i >> 1) *
frame->linesize[2]];
133 y_end = y +
frame->linesize[0] - 1;
134 u_end =
u +
frame->linesize[1] - 1;
135 v_end = v +
frame->linesize[2] - 1;
141 for (j = 0; j < linelength - 1; j++) {
161 for (j = 0; j < linelength - 4; ) {
162 if (y + 1 > y_end ||
u > u_end || v > v_end) {
#define AV_LOG_WARNING
Something somehow does not look correct.
static av_cold int init(AVCodecContext *avctx)
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
#define u(width, name, range_min, range_max)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
This structure describes decoded (raw) audio or video data.
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
#define MAGIC_1
Second header byte.
static av_cold int cpia_decode_init(AVCodecContext *avctx)
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
#define FF_DECODE_ERROR_INVALID_BITSTREAM
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
@ AV_PICTURE_TYPE_I
Intra.
#define FRAME_HEADER_SIZE
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
#define AV_CODEC_CAP_DR1
Codec uses get_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.
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
static const uint8_t header[24]
static av_cold int cpia_decode_end(AVCodecContext *avctx)
#define i(width, name, range_min, range_max)
const char * name
Name of the codec implementation.
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
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
main external API structure.
#define EOL
End Of Line marker.
@ AV_PICTURE_TYPE_P
Predicted.
This structure stores compressed data.
#define MAGIC_0
First header byte.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
static int cpia_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)