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22 #define BITSTREAM_READER_LE
62 s->num_superblocks = ((unsigned)avctx->
width / 8) *
63 ((unsigned)avctx->
height / 8);
77 for (
i = 0;
i < 3;
i++)
103 unsigned mask_bits =
get_bits(gb, 4);
107 for (j = 0; j < 4; j++) {
108 if (mask_bits & (1 << j))
109 cb.blocks[
i].pixels[j] = color1;
111 cb.blocks[
i].pixels[j] = color0;
129 if (
value != (1 + ((1 << 3) - 1)))
133 if (
value != (1 + ((1 << 3) - 1)) + ((1 << 7) - 1))
140 int* codebook_index,
int superblock_index)
144 unsigned block_index, depth;
147 static const int8_t transitions[3][2] = { {2, 1}, {0, 2}, {1, 0} };
149 *codebook_index = transitions[*codebook_index][
value];
152 depth =
s->codebooks[*codebook_index].depth;
159 if (*codebook_index == 1) {
160 block_index += superblock_index <<
s->codebooks[1].depth;
165 if (block_index >=
s->codebooks[*codebook_index].size)
168 return s->codebooks[*codebook_index].blocks[block_index];
176 dst[0] =
mb.pixels32[0];
177 dst[4] =
mb.pixels32[1];
181 uint16_t*
src,
unsigned src_stride)
185 for (y = 0; y < 8; y++)
186 memcpy(dest + y * dest_stride,
src + y * src_stride,
187 sizeof(uint16_t) * 8);
189 for (y = 0; y < 8; y++)
190 memset(dest + y * dest_stride, 0,
sizeof(uint16_t) * 8);
194 0x4, 0x8, 0x40, 0x80,
195 0x100, 0x200, 0x1000, 0x2000,
196 0x400, 0x800, 0x4000, 0x8000};
199 void *
data,
int *got_frame,
202 int buf_size = avpkt->
size;
210 unsigned superblock_index, cb_index = 1,
211 superblock_col_index = 0,
212 superblocks_per_row = avctx->
width / 8, skip = -1;
214 uint16_t* old_frame_data, *new_frame_data;
215 unsigned old_stride, new_stride;
236 if (!(frame_flags & 0x114) || !(frame_flags & 0x7800000)) {
237 if (!
s->frame->data[0])
249 for (
i = 0;
i < 3;
i++) {
250 if (frame_flags & (1 << (17 +
i))) {
251 unsigned cb_depth, cb_size;
260 cb_depth =
av_log2(cb_size - 1) + 1;
266 cb_size = 1 << cb_depth;
271 cb_size =
s->num_superblocks << cb_depth;
274 if (
s->num_superblocks >= INT_MAX >> cb_depth) {
281 if (!
s->codebooks[
i].blocks)
289 new_frame_data = (uint16_t*)
frame->data[0];
290 new_stride =
frame->linesize[0] / 2;
291 old_frame_data = (uint16_t*)
s->frame->data[0];
292 old_stride =
s->frame->linesize[0] / 2;
294 for (superblock_index = 0; superblock_index <
s->num_superblocks;
295 superblock_index++) {
298 unsigned multi_mask = 0;
308 old_frame_data, old_stride);
311 old_frame_data, old_stride);
318 for (
i = 0;
i < 16;
i++) {
326 unsigned inv_mask =
get_bits(&gb, 4);
327 for (
i = 0;
i < 4;
i++) {
328 if (inv_mask & (1 <<
i)) {
329 multi_mask ^= 0xF <<
i*4;
335 for (
i = 0;
i < 16;
i++) {
342 }
else if (frame_flags & (1 << 16)) {
352 superblock_col_index++;
356 if (superblock_col_index == superblocks_per_row) {
357 new_frame_data += new_stride * 8 - superblocks_per_row * 8;
359 old_frame_data += old_stride * 8 - superblocks_per_row * 8;
360 superblock_col_index = 0;
366 "Escape sizes: %i, %i, %i\n",
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
static void insert_mb_into_sb(SuperBlock *sb, MacroBlock mb, unsigned index)
static int get_bits_left(GetBitContext *gb)
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
static const uint16_t mask_matrix[]
static double cb(void *priv, double x, double y)
static unsigned int get_bits_long(GetBitContext *s, int n)
Read 0-32 bits.
static int get_bits_count(const GetBitContext *s)
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 MacroBlock decode_macroblock(Escape124Context *s, GetBitContext *gb, int *codebook_index, int superblock_index)
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
const AVCodec ff_escape124_decoder
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
static const uint16_t mask[17]
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
#define AV_GET_BUFFER_FLAG_REF
The decoder will keep a reference to the frame and may reuse it later.
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
static int escape124_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static unsigned int get_bits1(GetBitContext *s)
static void copy_superblock(uint16_t *dest, unsigned dest_stride, uint16_t *src, unsigned src_stride)
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.
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)
static CodeBook unpack_codebook(GetBitContext *gb, unsigned depth, unsigned size)
static av_cold int escape124_decode_close(AVCodecContext *avctx)
#define AV_PIX_FMT_RGB555
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 default value
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
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.
static av_cold int escape124_decode_init(AVCodecContext *avctx)
Initialize the decoder.
static av_always_inline int get_bitsz(GetBitContext *s, int n)
Read 0-25 bits.
This structure stores compressed data.
static unsigned decode_skip_count(GetBitContext *gb)
int width
picture width / height.
#define AVERROR_INVALIDDATA
Invalid data found when processing input.