51 #if CONFIG_ZLIB_DECODER 66 #if CONFIG_ZLIB_DECODER 76 static unsigned int mszh_decomp(
const unsigned char * srcptr,
int srclen,
unsigned char * destptr,
unsigned int destsize)
78 unsigned char *destptr_bak = destptr;
79 unsigned char *destptr_end = destptr + destsize;
80 const unsigned char *srcptr_end = srcptr + srclen;
81 unsigned mask = *srcptr++;
82 unsigned maskbit = 0x80;
84 while (srcptr < srcptr_end && destptr < destptr_end) {
85 if (!(mask & maskbit)) {
86 memcpy(destptr, srcptr, 4);
90 unsigned ofs = bytestream_get_le16(&srcptr);
91 unsigned cnt = (ofs >> 11) + 1;
93 ofs =
FFMIN(ofs, destptr - destptr_bak);
95 cnt =
FFMIN(cnt, destptr_end - destptr);
101 memset(destptr, 0, cnt);
109 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32)
break;
110 memcpy(destptr, srcptr, 32);
119 return destptr - destptr_bak;
123 #if CONFIG_ZLIB_DECODER 134 int zret = inflateReset(&c->zstream);
139 c->zstream.next_in =
src;
140 c->zstream.avail_in = src_len;
143 zret =
inflate(&c->zstream, Z_FINISH);
144 if (zret != Z_OK && zret != Z_STREAM_END) {
148 if (expected != (
unsigned int)c->zstream.total_out) {
150 expected, c->zstream.total_out);
153 return c->zstream.total_out;
163 int buf_size = avpkt->
size;
165 unsigned int pixel_ptr;
167 unsigned char *encoded = avpkt->
data, *outptr;
168 uint8_t *y_out, *u_out, *v_out;
171 unsigned int mszh_dlen;
172 unsigned char yq, y1q, uq, vq;
174 unsigned int mthread_inlen, mthread_outlen;
175 unsigned int len = buf_size;
181 outptr = frame->
data[0];
193 if (len < 8 || len - 8 < mthread_inlen) {
197 mthread_outlen =
AV_RL32(buf + 4);
200 if (mthread_outlen != mszh_dlen) {
202 mthread_outlen, mszh_dlen);
205 mszh_dlen =
mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
207 if (mthread_outlen != mszh_dlen) {
209 mthread_outlen, mszh_dlen);
244 if (len < ((width * height * bppx2) >> 1))
253 #if CONFIG_ZLIB_DECODER 259 len == width * height * 3) {
268 mthread_inlen =
FFMIN(mthread_inlen, len - 8);
269 mthread_outlen =
AV_RL32(buf + 4);
271 ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
272 if (ret < 0)
return ret;
273 ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
274 mthread_outlen, mthread_outlen);
275 if (ret < 0)
return ret;
277 int ret = zlib_decomp(avctx, buf, len, 0, c->
decomp_size);
278 if (ret < 0)
return ret;
285 av_log(avctx,
AV_LOG_ERROR,
"BUG! Unknown codec in frame decoder compression switch.\n");
295 for (row = 0; row <
height; row++) {
296 pixel_ptr = row * width * 3;
297 yq = encoded[pixel_ptr++];
298 uqvq =
AV_RL16(encoded+pixel_ptr);
300 for (col = 1; col <
width; col++) {
301 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
302 uqvq -=
AV_RL16(encoded+pixel_ptr+1);
303 AV_WL16(encoded+pixel_ptr+1, uqvq);
309 for (row = 0; row <
height; row++) {
310 pixel_ptr = row * width * 2;
312 for (col = 0; col < width/4; col++) {
313 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
314 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
315 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
316 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
317 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
318 encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
319 encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
320 encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
326 for (row = 0; row <
height; row++) {
327 pixel_ptr = row * width / 2 * 3;
329 for (col = 0; col < width/4; col++) {
330 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
331 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
332 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
333 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
334 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
335 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
341 for (row = 0; row <
height; row++) {
342 pixel_ptr = row * width * 2;
344 for (col = 0; col < width/2; col++) {
345 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
346 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
347 encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
348 encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
354 for (row = 0; row < height/2; row++) {
355 pixel_ptr = row * width * 3;
356 yq = y1q = uq = vq =0;
357 for (col = 0; col < width/2; col++) {
358 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
359 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
360 encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
361 encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
362 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
363 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
375 y_out = frame->
data[0] + (height - 1) * frame->
linesize[0];
376 u_out = frame->
data[1] + (height - 1) * frame->
linesize[1];
377 v_out = frame->
data[2] + (height - 1) * frame->
linesize[2];
380 for (row = 0; row <
height; row++) {
381 for (col = 0; col <
width; col++) {
382 y_out[col] = *encoded++;
383 u_out[col] = *encoded++ + 128;
384 v_out[col] = *encoded++ + 128;
392 for (row = 0; row <
height; row++) {
393 for (col = 0; col < width - 3; col += 4) {
394 memcpy(y_out + col, encoded, 4);
396 u_out[ col >> 1 ] = *encoded++ + 128;
397 u_out[(col >> 1) + 1] = *encoded++ + 128;
398 v_out[ col >> 1 ] = *encoded++ + 128;
399 v_out[(col >> 1) + 1] = *encoded++ + 128;
408 for (row = height - 1; row >= 0; row--) {
409 pixel_ptr = row * frame->
linesize[0];
410 memcpy(outptr + pixel_ptr, encoded, 3 * width);
415 for (row = 0; row <
height; row++) {
416 for (col = 0; col < width - 3; col += 4) {
417 memcpy(y_out + col, encoded, 4);
419 u_out[col >> 2] = *encoded++ + 128;
420 v_out[col >> 2] = *encoded++ + 128;
428 for (row = 0; row <
height; row++) {
429 for (col = 0; col < width - 1; col += 2) {
430 memcpy(y_out + col, encoded, 2);
432 u_out[col >> 1] = *encoded++ + 128;
433 v_out[col >> 1] = *encoded++ + 128;
441 u_out = frame->
data[1] + ((height >> 1) - 1) * frame->
linesize[1];
442 v_out = frame->
data[2] + ((height >> 1) - 1) * frame->
linesize[2];
443 for (row = 0; row < height - 1; row += 2) {
444 for (col = 0; col < width - 1; col += 2) {
445 memcpy(y_out + col, encoded, 2);
447 memcpy(y_out + col - frame->
linesize[0], encoded, 2);
449 u_out[col >> 1] = *encoded++ + 128;
450 v_out[col >> 1] = *encoded++ + 128;
474 unsigned int basesize = avctx->
width * avctx->
height;
477 unsigned int max_decomp_size;
478 int subsample_h, subsample_v;
488 av_log(avctx,
AV_LOG_ERROR,
"Codec id and codec type mismatch. This should not happen.\n");
495 max_decomp_size = max_basesize * 3;
501 max_decomp_size = max_basesize * 2;
504 if (avctx->
width % 4) {
511 max_decomp_size = max_basesize * 3;
517 max_decomp_size = max_basesize / 2 * 3;
523 max_decomp_size = max_basesize * 2;
529 max_decomp_size = max_basesize / 2 * 3;
539 if (avctx->
width % (1<<subsample_h) || avctx->
height % (1<<subsample_v)) {
561 #if CONFIG_ZLIB_DECODER 607 #if CONFIG_ZLIB_DECODER 610 c->zstream.zalloc = Z_NULL;
611 c->zstream.zfree = Z_NULL;
612 c->zstream.opaque = Z_NULL;
613 zret = inflateInit(&c->zstream);
630 #if CONFIG_ZLIB_DECODER 632 inflateEnd(&c->zstream);
638 #if CONFIG_MSZH_DECODER 653 #if CONFIG_ZLIB_DECODER #define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Memory handling functions.
static av_cold int init(AVCodecContext *avctx)
#define avpriv_request_sample(...)
#define COMP_ZLIB_HISPEED
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Multithreading support functions.
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
Overlapping memcpy() implementation.
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static const uint16_t mask[17]
int av_pix_fmt_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift)
Utility function to access log2_chroma_w log2_chroma_h from the pixel format AVPixFmtDescriptor.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
const char * name
Name of the codec implementation.
static const uint8_t offset[127][2]
#define AV_CODEC_CAP_FRAME_THREADS
Codec supports frame-level multithreading.
planar YUV 4:2:2, 16bpp, (1 Cr & Cb sample per 2x1 Y samples)
enum AVPictureType pict_type
Picture type of the frame.
int width
picture width / height.
packed RGB 8:8:8, 24bpp, BGRBGR...
unsigned char * decomp_buf
Libavcodec external API header.
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
int ff_thread_get_buffer(AVCodecContext *avctx, ThreadFrame *f, int flags)
Wrapper around get_buffer() for frame-multithreaded codecs.
main external API structure.
static void inflate(uint8_t *dst, const uint8_t *p1, int width, int threshold, const uint8_t *coordinates[], int coord, int maxc)
static av_cold int decode_end(AVCodecContext *avctx)
static unsigned int mszh_decomp(const unsigned char *srcptr, int srclen, unsigned char *destptr, unsigned int destsize)
static av_cold int decode_init(AVCodecContext *avctx)
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
common internal api header.
planar YUV 4:1:1, 12bpp, (1 Cr & Cb sample per 4x1 Y samples)
#define AVERROR_UNKNOWN
Unknown error, typically from an external library.
int key_frame
1 -> keyframe, 0-> not
This structure stores compressed data.
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.