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);
151 if (expected > (
unsigned int)c->zstream.total_out)
152 return (
unsigned int)c->zstream.total_out;
155 return c->zstream.total_out;
165 int buf_size = avpkt->
size;
167 unsigned int pixel_ptr;
169 unsigned char *encoded = avpkt->
data, *outptr;
170 uint8_t *y_out, *u_out, *v_out;
173 unsigned int mszh_dlen;
174 unsigned char yq, y1q, uq, vq;
176 unsigned int mthread_inlen, mthread_outlen;
177 unsigned int len = buf_size;
183 outptr = frame->
data[0];
195 if (len < 8 || len - 8 < mthread_inlen) {
199 mthread_outlen =
AV_RL32(buf + 4);
202 if (mthread_outlen != mszh_dlen) {
204 mthread_outlen, mszh_dlen);
207 mszh_dlen =
mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
209 if (mthread_outlen != mszh_dlen) {
211 mthread_outlen, mszh_dlen);
229 int aligned_width =
width;
249 if (len < ((aligned_width * height * bppx2) >> 1))
258 #if CONFIG_ZLIB_DECODER 264 len == width * height * 3) {
273 mthread_inlen =
FFMIN(mthread_inlen, len - 8);
274 mthread_outlen =
AV_RL32(buf + 4);
276 ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
277 if (ret < 0)
return ret;
278 ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
279 mthread_outlen, mthread_outlen);
280 if (ret < 0)
return ret;
283 int ret = zlib_decomp(avctx, buf, len, 0, c->
decomp_size);
284 if (ret < 0)
return ret;
291 av_log(avctx,
AV_LOG_ERROR,
"BUG! Unknown codec in frame decoder compression switch.\n");
301 for (row = 0; row <
height; row++) {
302 pixel_ptr = row * width * 3;
303 yq = encoded[pixel_ptr++];
304 uqvq =
AV_RL16(encoded+pixel_ptr);
306 for (col = 1; col <
width; col++) {
307 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
308 uqvq -=
AV_RL16(encoded+pixel_ptr+1);
309 AV_WL16(encoded+pixel_ptr+1, uqvq);
316 for (row = 0; row <
height; row++) {
318 for (col = 0; col < width/4; col++) {
319 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
320 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
321 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
322 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
323 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
324 encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
325 encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
326 encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
333 for (row = 0; row <
height; row++) {
335 for (col = 0; col < width/4; col++) {
336 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
337 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
338 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
339 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
340 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
341 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
347 for (row = 0; row <
height; row++) {
348 pixel_ptr = row * width * 2;
350 for (col = 0; col < width/2; col++) {
351 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
352 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
353 encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
354 encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
360 for (row = 0; row < height/2; row++) {
361 pixel_ptr = row * width * 3;
362 yq = y1q = uq = vq =0;
363 for (col = 0; col < width/2; col++) {
364 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
365 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
366 encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
367 encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
368 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
369 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
381 y_out = frame->
data[0] + (height - 1) * frame->
linesize[0];
382 u_out = frame->
data[1] + (height - 1) * frame->
linesize[1];
383 v_out = frame->
data[2] + (height - 1) * frame->
linesize[2];
386 for (row = 0; row <
height; row++) {
387 for (col = 0; col <
width; col++) {
388 y_out[col] = *encoded++;
389 u_out[col] = *encoded++ + 128;
390 v_out[col] = *encoded++ + 128;
398 for (row = 0; row <
height; row++) {
399 for (col = 0; col < width - 3; col += 4) {
400 memcpy(y_out + col, encoded, 4);
402 u_out[ col >> 1 ] = *encoded++ + 128;
403 u_out[(col >> 1) + 1] = *encoded++ + 128;
404 v_out[ col >> 1 ] = *encoded++ + 128;
405 v_out[(col >> 1) + 1] = *encoded++ + 128;
407 if (col && col < width) {
408 u_out[ col >> 1 ] = u_out[(col>>1) - 1];
409 v_out[ col >> 1 ] = v_out[(col>>1) - 1];
419 for (row = height - 1; row >= 0; row--) {
420 pixel_ptr = row * frame->
linesize[0];
421 memcpy(outptr + pixel_ptr, encoded, 3 * width);
426 for (row = 0; row <
height; row++) {
427 for (col = 0; col < width - 3; col += 4) {
428 memcpy(y_out + col, encoded, 4);
430 u_out[col >> 2] = *encoded++ + 128;
431 v_out[col >> 2] = *encoded++ + 128;
433 if (col && col < width) {
434 u_out[col >> 2] = u_out[(col>>2) - 1];
435 v_out[col >> 2] = v_out[(col>>2) - 1];
443 for (row = 0; row <
height; row++) {
444 for (col = 0; col < width - 1; col += 2) {
445 memcpy(y_out + col, encoded, 2);
447 u_out[col >> 1] = *encoded++ + 128;
448 v_out[col >> 1] = *encoded++ + 128;
456 u_out = frame->
data[1] + ((height >> 1) - 1) * frame->
linesize[1];
457 v_out = frame->
data[2] + ((height >> 1) - 1) * frame->
linesize[2];
458 for (row = 0; row < height - 1; row += 2) {
459 for (col = 0; col < width - 1; col += 2) {
460 memcpy(y_out + col, encoded, 2);
462 memcpy(y_out + col - frame->
linesize[0], encoded, 2);
464 u_out[col >> 1] = *encoded++ + 128;
465 v_out[col >> 1] = *encoded++ + 128;
489 unsigned int basesize = avctx->
width * avctx->
height;
492 unsigned int max_decomp_size;
493 int subsample_h, subsample_v;
494 int partial_h_supported = 0;
504 av_log(avctx,
AV_LOG_ERROR,
"Codec id and codec type mismatch. This should not happen.\n");
511 max_decomp_size = max_basesize * 3;
517 max_decomp_size = max_basesize * 2;
520 partial_h_supported = 1;
524 max_decomp_size = max_basesize * 3;
530 max_decomp_size = max_basesize / 2 * 3;
533 partial_h_supported = 1;
537 max_decomp_size = max_basesize * 2;
543 max_decomp_size = max_basesize / 2 * 3;
553 if ((avctx->
width % (1<<subsample_h) && !partial_h_supported) || avctx->
height % (1<<subsample_v)) {
575 #if CONFIG_ZLIB_DECODER 621 #if CONFIG_ZLIB_DECODER 624 c->zstream.zalloc = Z_NULL;
625 c->zstream.zfree = Z_NULL;
626 c->zstream.opaque = Z_NULL;
627 zret = inflateInit(&c->zstream);
644 #if CONFIG_ZLIB_DECODER 646 inflateEnd(&c->zstream);
652 #if CONFIG_MSZH_DECODER 667 #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.