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49 const uint8_t *buf = avpkt->
data;
50 const uint8_t *buf_end = avpkt->
data + avpkt->
size;
51 int buf_size = avpkt->
size;
54 const uint8_t *
table, *vect;
56 int i, j, x, y,
stride,
ret, vect_w = 3, vect_h = 3;
69 if (buf_end - buf < 4)
77 uint32_t *pal = (uint32_t *) p->
data[1];
81 if (
first >= 256 || last > 256 || buf_end - buf < 4 + 4 + 3 * (last -
first))
85 pal[
i] = (buf[0] << 18) | (buf[1] << 10) | (buf[2] << 2);
86 pal[
i] |= 0xFF
U << 24 | (pal[
i] >> 6) & 0x30303;
120 if (buf_end - buf < 256 * vect_w * vect_h)
122 table = buf + (256 * vect_w * vect_h);
124 int map_size = ((318 / vect_w + 7) / 8) * (198 / vect_h);
125 if (buf_end -
table < map_size)
131 for (y=0; y<198; y+=vect_h) {
132 for (x=0; x<318; x+=vect_w) {
134 if (buf_end -
table < 1)
136 vect = &buf[*
table++ * (vect_w * vect_h)];
137 for (j=0; j<vect_w; j++) {
138 out[(y + 0) *
stride + x + j] = vect[(0 * vect_w) + j];
139 out[(y + 1) *
stride + x + j] = vect[(1 * vect_w) + j];
142 vect[(2 * vect_w) + j];
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.
static av_cold int avs_decode_end(AVCodecContext *avctx)
static const uint16_t table[]
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.
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
const FFCodec ff_avs_decoder
AVCodec p
The public AVCodec.
int key_frame
1 -> keyframe, 0-> not
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 type
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
static av_cold int avs_decode_init(AVCodecContext *avctx)
trying all byte sequences megabyte in length and selecting the best looking sequence will yield cases to try But first
#define FF_CODEC_DECODE_CB(func)
int(* init)(AVBSFContext *ctx)
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
#define CODEC_LONG_NAME(str)
static unsigned int get_bits1(GetBitContext *s)
@ AV_PICTURE_TYPE_I
Intra.
static int avs_decode_frame(AVCodecContext *avctx, AVFrame *picture, int *got_frame, AVPacket *avpkt)
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 av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
#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.
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available.
static const uint8_t * align_get_bits(GetBitContext *s)
main external API structure.
@ AV_PICTURE_TYPE_P
Predicted.
This structure stores compressed data.
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.