27 #define BITSTREAM_READER_LE 40 const unsigned char *src_end,
41 unsigned char *dst,
int dst_size)
49 for (i = 0, sz = 0; i < 64 && sz < dst_size; i++) {
53 sz +=
FFABS(code_table[i]);
58 for (i = 0; i < 64 && dst_size > 0; i++) {
62 if (src_end - src < 1)
64 memset(dst, *src++,
FFMIN(len, dst_size));
66 if (src_end - src < len)
68 memcpy(dst, src,
FFMIN(len, dst_size));
78 const unsigned char *
src,
79 const unsigned char *src_end,
85 unsigned char block[8 * 8];
87 if (src_end - src < 1)
94 for (b = 0; b < 8; b++) {
95 memcpy(dst, &block[b * 8], 8);
101 for (i = 0; i < 8; i++) {
102 for (b = 0; b < 8; b++)
112 if (src_end - src < len + 8 * bits)
117 for (b = 0; b < 8; b++) {
118 for (i = 0; i < 8; i++)
119 dst[i] = color_table[
get_bits(&gb, bits)];
128 const unsigned char *
src,
129 const unsigned char *src_end,
134 if (src_end - src < 8 * 8)
137 for (i = 0; i < 8; i++) {
147 const unsigned char *
src,
148 const unsigned char *src_end,
154 if (src_end - src < 2)
157 offset = ((pos >> 3) & 7) * seq->
frame->
linesize[0] + (pos & 7);
159 }
while (!(pos & 0x80));
166 const unsigned char *data_end = data + data_size;
176 palette = (uint32_t *)seq->
frame->
data[1];
177 if (data_end - data < 256 * 3)
179 for (i = 0; i < 256; i++) {
180 for (j = 0; j < 3; j++, data++)
181 c[j] = (*data << 2) | (*data >> 4);
188 if (data_end - data < 128)
191 for (y = 0; y < 128; y += 8)
192 for (x = 0; x < 256; x += 8) {
233 void *
data,
int *got_frame,
237 int buf_size = avpkt->
size;
265 .
name =
"tiertexseqvideo",
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
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 av_cold int init(AVCodecContext *avctx)
static av_cold int seqvideo_decode_end(AVCodecContext *avctx)
static av_cold int seqvideo_decode_init(AVCodecContext *avctx)
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static int seqvideo_decode(SeqVideoContext *seq, const unsigned char *data, int data_size)
static int get_sbits(GetBitContext *s, int n)
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
The exact code depends on how similar the blocks are and how related they are to the block
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
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
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
static int get_bits_count(const GetBitContext *s)
bitstream reader API header.
static int get_bits_left(GetBitContext *gb)
static const unsigned char * seq_unpack_rle_block(const unsigned char *src, const unsigned char *src_end, unsigned char *dst, int dst_size)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
static const ColorEntry color_table[]
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
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...
const char * name
Name of the codec implementation.
static const unsigned char * seq_decode_op3(SeqVideoContext *seq, const unsigned char *src, const unsigned char *src_end, unsigned char *dst)
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
static const unsigned char * seq_decode_op1(SeqVideoContext *seq, const unsigned char *src, const unsigned char *src_end, unsigned char *dst)
const uint8_t ff_log2_tab[256]
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_RB24
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
main external API structure.
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
int palette_has_changed
Tell user application that palette has changed from previous frame.
#define flags(name, subs,...)
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static int op(uint8_t **dst, const uint8_t *dst_end, GetByteContext *gb, int pixel, int count, int *x, int width, int linesize)
Perform decode operation.
common internal api header.
static int seqvideo_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static const unsigned char * seq_decode_op2(SeqVideoContext *seq, const unsigned char *src, const unsigned char *src_end, unsigned char *dst)
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.
AVCodec ff_tiertexseqvideo_decoder
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.