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38 uint8_t *prev = prev_pic->
data[0];
57 zret = inflateReset(zstream);
66 zstream->next_in = avpkt->
data;
67 zstream->avail_in = avpkt->
size;
77 zstream->next_out = dst;
78 zstream->avail_out = avctx->
width << 1;
80 zret =
inflate(zstream, Z_SYNC_FLUSH);
81 if (zret != Z_OK && zret != Z_STREAM_END) {
83 "Inflate failed with return code: %d.\n", zret);
88 for (j = 0; j < avctx->
width << 1; j++)
89 dst[j] += prev[j] & -!dst[j];
138 .p.name =
"zerocodec",
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
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
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 flags
Frame flags, a combination of AV_FRAME_FLAGS.
static av_cold int zerocodec_decode_close(AVCodecContext *avctx)
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
AVCodec p
The public AVCodec.
static void zerocodec_decode_flush(AVCodecContext *avctx)
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord, int maxc)
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.
#define AV_FRAME_FLAG_KEY
A flag to mark frames that are keyframes.
#define FF_CODEC_DECODE_CB(func)
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
int(* init)(AVBSFContext *ctx)
int bits_per_raw_sample
Bits per sample/pixel of internal libavcodec pixel/sample format.
static int zerocodec_decode_frame(AVCodecContext *avctx, AVFrame *pic, int *got_frame, AVPacket *avpkt)
#define CODEC_LONG_NAME(str)
static av_cold int zerocodec_decode_init(AVCodecContext *avctx)
@ AV_PICTURE_TYPE_I
Intra.
const FFCodec ff_zerocodec_decoder
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
enum AVPictureType pict_type
Picture type of the frame.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
int flags
A combination of AV_PKT_FLAG values.
#define i(width, name, range_min, range_max)
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
void ff_inflate_end(FFZStream *zstream)
Wrapper around inflateEnd().
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
@ AV_PIX_FMT_UYVY422
packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1
int av_frame_replace(AVFrame *dst, const AVFrame *src)
Ensure the destination frame refers to the same data described by the source frame,...
main external API structure.
@ AV_PICTURE_TYPE_P
Predicted.
This structure stores compressed data.
int ff_inflate_init(FFZStream *zstream, void *logctx)
Wrapper around inflateInit().
int width
picture width / height.
int linesize[AV_NUM_DATA_POINTERS]
For video, a positive or negative value, which is typically indicating the size in bytes of each pict...
#define AVERROR_INVALIDDATA
Invalid data found when processing input.