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ffmpeg/libavcodec/lcl.c

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/*
* LCL (LossLess Codec Library) Codec
* Copyright (c) 2002-2004 Roberto Togni
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/**
* @file lcl.c
* LCL (LossLess Codec Library) Video Codec
* Decoder for MSZH and ZLIB codecs
* Experimental encoder for ZLIB RGB24
*
* Fourcc: MSZH, ZLIB
*
* Original Win32 dll:
* Ver2.23 By Kenji Oshima 2000.09.20
* avimszh.dll, avizlib.dll
*
* A description of the decoding algorithm can be found here:
* http://www.pcisys.net/~melanson/codecs
*
* Supports: BGR24 (RGB 24bpp)
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "common.h"
#include "bitstream.h"
#include "avcodec.h"
#ifdef CONFIG_ZLIB
#include <zlib.h>
#endif
#define BMPTYPE_YUV 1
#define BMPTYPE_RGB 2
#define IMGTYPE_YUV111 0
#define IMGTYPE_YUV422 1
#define IMGTYPE_RGB24 2
#define IMGTYPE_YUV411 3
#define IMGTYPE_YUV211 4
#define IMGTYPE_YUV420 5
#define COMP_MSZH 0
#define COMP_MSZH_NOCOMP 1
#define COMP_ZLIB_HISPEED 1
#define COMP_ZLIB_HICOMP 9
#define COMP_ZLIB_NORMAL -1
#define FLAG_MULTITHREAD 1
#define FLAG_NULLFRAME 2
#define FLAG_PNGFILTER 4
#define FLAGMASK_UNUSED 0xf8
#define CODEC_MSZH 1
#define CODEC_ZLIB 3
#define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
#define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
/*
* Decoder context
*/
typedef struct LclContext {
AVCodecContext *avctx;
AVFrame pic;
PutBitContext pb;
// Image type
int imgtype;
// Compression type
int compression;
// Flags
int flags;
// Decompressed data size
unsigned int decomp_size;
// Decompression buffer
unsigned char* decomp_buf;
// Maximum compressed data size
unsigned int max_comp_size;
// Compression buffer
unsigned char* comp_buf;
#ifdef CONFIG_ZLIB
z_stream zstream;
#endif
} LclContext;
/*
*
* Helper functions
*
*/
static inline unsigned char fix (int pix14)
{
int tmp;
tmp = (pix14 + 0x80000) >> 20;
if (tmp < 0)
return 0;
if (tmp > 255)
return 255;
return tmp;
}
static inline unsigned char get_b (unsigned char yq, signed char bq)
{
return fix((yq << 20) + bq * 1858076);
}
static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
{
return fix((yq << 20) - bq * 360857 - rq * 748830);
}
static inline unsigned char get_r (unsigned char yq, signed char rq)
{
return fix((yq << 20) + rq * 1470103);
}
static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
{
unsigned char *destptr_bak = destptr;
unsigned char *destptr_end = destptr + destsize;
unsigned char mask = 0;
unsigned char maskbit = 0;
unsigned int ofs, cnt;
while ((srclen > 0) && (destptr < destptr_end)) {
if (maskbit == 0) {
mask = *(srcptr++);
maskbit = 8;
srclen--;
continue;
}
if ((mask & (1 << (--maskbit))) == 0) {
if (destptr + 4 > destptr_end)
break;
*(int*)destptr = *(int*)srcptr;
srclen -= 4;
destptr += 4;
srcptr += 4;
} else {
ofs = *(srcptr++);
cnt = *(srcptr++);
ofs += cnt * 256;;
cnt = ((cnt >> 3) & 0x1f) + 1;
ofs &= 0x7ff;
srclen -= 2;
cnt *= 4;
if (destptr + cnt > destptr_end) {
cnt = destptr_end - destptr;
}
for (; cnt > 0; cnt--) {
*(destptr) = *(destptr - ofs);
destptr++;
}
}
}
return (destptr - destptr_bak);
}
/*
*
* Decode a frame
*
*/
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
{
LclContext * const c = (LclContext *)avctx->priv_data;
unsigned char *encoded = (unsigned char *)buf;
unsigned int pixel_ptr;
int row, col;
unsigned char *outptr;
unsigned int width = avctx->width; // Real image width
unsigned int height = avctx->height; // Real image height
unsigned int mszh_dlen;
unsigned char yq, y1q, uq, vq;
int uqvq;
unsigned int mthread_inlen, mthread_outlen;
#ifdef CONFIG_ZLIB
int zret; // Zlib return code
#endif
unsigned int len = buf_size;
if(c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
c->pic.reference = 0;
c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
if(avctx->get_buffer(avctx, &c->pic) < 0){
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
outptr = c->pic.data[0]; // Output image pointer
/* Decompress frame */
switch (avctx->codec_id) {
case CODEC_ID_MSZH:
switch (c->compression) {
case COMP_MSZH:
if (c->flags & FLAG_MULTITHREAD) {
mthread_inlen = *((unsigned int*)encoded);
mthread_outlen = *((unsigned int*)(encoded+4));
if (mthread_outlen > c->decomp_size) // this should not happen
mthread_outlen = c->decomp_size;
mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
if (mthread_outlen != mszh_dlen) {
av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
mthread_outlen, mszh_dlen);
return -1;
}
mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
if (mthread_outlen != mszh_dlen) {
av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
mthread_outlen, mszh_dlen);
return -1;
}
encoded = c->decomp_buf;
len = c->decomp_size;
} else {
mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
if (c->decomp_size != mszh_dlen) {
av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
c->decomp_size, mszh_dlen);
return -1;
}
encoded = c->decomp_buf;
len = mszh_dlen;
}
break;
case COMP_MSZH_NOCOMP:
break;
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
return -1;
}
break;
case CODEC_ID_ZLIB:
#ifdef CONFIG_ZLIB
/* Using the original dll with normal compression (-1) and RGB format
* gives a file with ZLIB fourcc, but frame is really uncompressed.
* To be sure that's true check also frame size */
if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
(len == width * height * 3))
break;
zret = inflateReset(&(c->zstream));
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
return -1;
}
if (c->flags & FLAG_MULTITHREAD) {
mthread_inlen = *((unsigned int*)encoded);
mthread_outlen = *((unsigned int*)(encoded+4));
if (mthread_outlen > c->decomp_size)
mthread_outlen = c->decomp_size;
c->zstream.next_in = encoded + 8;
c->zstream.avail_in = mthread_inlen;
c->zstream.next_out = c->decomp_buf;
c->zstream.avail_out = c->decomp_size;
zret = inflate(&(c->zstream), Z_FINISH);
if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
return -1;
}
if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
mthread_outlen, c->zstream.total_out);
return -1;
}
zret = inflateReset(&(c->zstream));
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
return -1;
}
c->zstream.next_in = encoded + 8 + mthread_inlen;
c->zstream.avail_in = len - mthread_inlen;
c->zstream.next_out = c->decomp_buf + mthread_outlen;
c->zstream.avail_out = c->decomp_size - mthread_outlen;
zret = inflate(&(c->zstream), Z_FINISH);
if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
return -1;
}
if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
mthread_outlen, c->zstream.total_out);
return -1;
}
} else {
c->zstream.next_in = encoded;
c->zstream.avail_in = len;
c->zstream.next_out = c->decomp_buf;
c->zstream.avail_out = c->decomp_size;
zret = inflate(&(c->zstream), Z_FINISH);
if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
return -1;
}
if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
c->decomp_size, c->zstream.total_out);
return -1;
}
}
encoded = c->decomp_buf;
len = c->decomp_size;;
#else
av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
return -1;
#endif
break;
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
return -1;
}
/* Apply PNG filter */
if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
switch (c->imgtype) {
case IMGTYPE_YUV111:
case IMGTYPE_RGB24:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 3;
yq = encoded[pixel_ptr++];
uqvq = encoded[pixel_ptr++];
uqvq+=(encoded[pixel_ptr++] << 8);
for (col = 1; col < width; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
uqvq -= (encoded[pixel_ptr+1] | (encoded[pixel_ptr+2]<<8));
encoded[pixel_ptr+1] = (uqvq) & 0xff;
encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
pixel_ptr += 3;
}
}
break;
case IMGTYPE_YUV422:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 2;
yq = uq = vq =0;
for (col = 0; col < width/4; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
pixel_ptr += 8;
}
}
break;
case IMGTYPE_YUV411:
for (row = 0; row < height; row++) {
pixel_ptr = row * width / 2 * 3;
yq = uq = vq =0;
for (col = 0; col < width/4; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
pixel_ptr += 6;
}
}
break;
case IMGTYPE_YUV211:
for (row = 0; row < height; row++) {
pixel_ptr = row * width * 2;
yq = uq = vq =0;
for (col = 0; col < width/2; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
pixel_ptr += 4;
}
}
break;
case IMGTYPE_YUV420:
for (row = 0; row < height/2; row++) {
pixel_ptr = row * width * 3;
yq = y1q = uq = vq =0;
for (col = 0; col < width/2; col++) {
encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
pixel_ptr += 6;
}
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
return -1;
}
}
/* Convert colorspace */
switch (c->imgtype) {
case IMGTYPE_YUV111:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * c->pic.linesize[0];
for (col = 0; col < width; col++) {
outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
encoded += 3;
}
}
break;
case IMGTYPE_YUV422:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * c->pic.linesize[0];
for (col = 0; col < width/4; col++) {
outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
encoded += 8;
}
}
break;
case IMGTYPE_RGB24:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * c->pic.linesize[0];
for (col = 0; col < width; col++) {
outptr[pixel_ptr++] = encoded[0];
outptr[pixel_ptr++] = encoded[1];
outptr[pixel_ptr++] = encoded[2];
encoded += 3;
}
}
break;
case IMGTYPE_YUV411:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * c->pic.linesize[0];
for (col = 0; col < width/4; col++) {
outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
encoded += 6;
}
}
break;
case IMGTYPE_YUV211:
for (row = height - 1; row >= 0; row--) {
pixel_ptr = row * c->pic.linesize[0];
for (col = 0; col < width/2; col++) {
outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
encoded += 4;
}
}
break;
case IMGTYPE_YUV420:
for (row = height / 2 - 1; row >= 0; row--) {
pixel_ptr = 2 * row * c->pic.linesize[0];
for (col = 0; col < width/2; col++) {
outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
pixel_ptr += 6;
encoded += 6;
}
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
return -1;
}
*data_size = sizeof(AVFrame);
*(AVFrame*)data = c->pic;
/* always report that the buffer was completely consumed */
return buf_size;
}
/*
*
* Encode a frame
*
*/
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
LclContext *c = avctx->priv_data;
AVFrame *pict = data;
AVFrame * const p = &c->pic;
int i;
int zret; // Zlib return code
#ifndef CONFIG_ZLIB
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
return -1;
#else
init_put_bits(&c->pb, buf, buf_size);
*p = *pict;
p->pict_type= FF_I_TYPE;
p->key_frame= 1;
if(avctx->pix_fmt != PIX_FMT_BGR24){
av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
return -1;
}
zret = deflateReset(&(c->zstream));
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
return -1;
}
c->zstream.next_out = c->comp_buf;
c->zstream.avail_out = c->max_comp_size;
for(i = avctx->height - 1; i >= 0; i--) {
c->zstream.next_in = p->data[0]+p->linesize[0]*i;
c->zstream.avail_in = avctx->width*3;
zret = deflate(&(c->zstream), Z_NO_FLUSH);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
return -1;
}
}
zret = deflate(&(c->zstream), Z_FINISH);
if (zret != Z_STREAM_END) {
av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
return -1;
}
for (i = 0; i < c->zstream.total_out; i++)
put_bits(&c->pb, 8, c->comp_buf[i]);
flush_put_bits(&c->pb);
return c->zstream.total_out;
#endif
}
/*
*
* Init lcl decoder
*
*/
static int decode_init(AVCodecContext *avctx)
{
LclContext * const c = (LclContext *)avctx->priv_data;
unsigned int basesize = avctx->width * avctx->height;
unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
unsigned int max_decomp_size;
int zret; // Zlib return code
c->avctx = avctx;
avctx->has_b_frames = 0;
c->pic.data[0] = NULL;
#ifdef CONFIG_ZLIB
// Needed if zlib unused or init aborted before inflateInit
memset(&(c->zstream), 0, sizeof(z_stream));
#endif
if (avctx->extradata_size < 8) {
av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
return 1;
}
if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
return 1;
}
/* Check codec type */
if (((avctx->codec_id == CODEC_ID_MSZH) && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
((avctx->codec_id == CODEC_ID_ZLIB) && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
}
/* Detect image type */
switch (c->imgtype = *((char *)avctx->extradata + 4)) {
case IMGTYPE_YUV111:
c->decomp_size = basesize * 3;
max_decomp_size = max_basesize * 3;
av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
break;
case IMGTYPE_YUV422:
c->decomp_size = basesize * 2;
max_decomp_size = max_basesize * 2;
av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
break;
case IMGTYPE_RGB24:
c->decomp_size = basesize * 3;
max_decomp_size = max_basesize * 3;
av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
break;
case IMGTYPE_YUV411:
c->decomp_size = basesize / 2 * 3;
max_decomp_size = max_basesize / 2 * 3;
av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
break;
case IMGTYPE_YUV211:
c->decomp_size = basesize * 2;
max_decomp_size = max_basesize * 2;
av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
break;
case IMGTYPE_YUV420:
c->decomp_size = basesize / 2 * 3;
max_decomp_size = max_basesize / 2 * 3;
av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
return 1;
}
/* Detect compression method */
c->compression = *((char *)avctx->extradata + 5);
switch (avctx->codec_id) {
case CODEC_ID_MSZH:
switch (c->compression) {
case COMP_MSZH:
av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
break;
case COMP_MSZH_NOCOMP:
c->decomp_size = 0;
av_log(avctx, AV_LOG_INFO, "No compression.\n");
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
return 1;
}
break;
case CODEC_ID_ZLIB:
#ifdef CONFIG_ZLIB
switch (c->compression) {
case COMP_ZLIB_HISPEED:
av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
break;
case COMP_ZLIB_HICOMP:
av_log(avctx, AV_LOG_INFO, "High compression.\n");
break;
case COMP_ZLIB_NORMAL:
av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
break;
default:
if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
return 1;
}
av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
}
#else
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
return 1;
#endif
break;
default:
av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
return 1;
}
/* Allocate decompression buffer */
if (c->decomp_size) {
if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
return 1;
}
}
/* Detect flags */
c->flags = *((char *)avctx->extradata + 6);
if (c->flags & FLAG_MULTITHREAD)
av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
if (c->flags & FLAG_NULLFRAME)
av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
if (c->flags & FLAGMASK_UNUSED)
av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
/* If needed init zlib */
if (avctx->codec_id == CODEC_ID_ZLIB) {
#ifdef CONFIG_ZLIB
c->zstream.zalloc = Z_NULL;
c->zstream.zfree = Z_NULL;
c->zstream.opaque = Z_NULL;
zret = inflateInit(&(c->zstream));
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
return 1;
}
#else
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
return 1;
#endif
}
avctx->pix_fmt = PIX_FMT_BGR24;
return 0;
}
/*
*
* Init lcl encoder
*
*/
static int encode_init(AVCodecContext *avctx)
{
LclContext *c = avctx->priv_data;
int zret; // Zlib return code
#ifndef CONFIG_ZLIB
av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
return 1;
#else
c->avctx= avctx;
assert(avctx->width && avctx->height);
avctx->extradata= av_mallocz(8);
avctx->coded_frame= &c->pic;
// Will be user settable someday
c->compression = 6;
c->flags = 0;
switch(avctx->pix_fmt){
case PIX_FMT_BGR24:
c->imgtype = IMGTYPE_RGB24;
c->decomp_size = avctx->width * avctx->height * 3;
avctx->bits_per_sample= 24;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
return -1;
}
((uint8_t*)avctx->extradata)[0]= 4;
((uint8_t*)avctx->extradata)[1]= 0;
((uint8_t*)avctx->extradata)[2]= 0;
((uint8_t*)avctx->extradata)[3]= 0;
((uint8_t*)avctx->extradata)[4]= c->imgtype;
((uint8_t*)avctx->extradata)[5]= c->compression;
((uint8_t*)avctx->extradata)[6]= c->flags;
((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
c->avctx->extradata_size= 8;
c->zstream.zalloc = Z_NULL;
c->zstream.zfree = Z_NULL;
c->zstream.opaque = Z_NULL;
zret = deflateInit(&(c->zstream), c->compression);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
return 1;
}
/* Conservative upper bound taken from zlib v1.2.1 source */
c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
((c->decomp_size + 63) >> 6) + 11;
if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
return 1;
}
return 0;
#endif
}
/*
*
* Uninit lcl decoder
*
*/
static int decode_end(AVCodecContext *avctx)
{
LclContext * const c = (LclContext *)avctx->priv_data;
if (c->pic.data[0])
avctx->release_buffer(avctx, &c->pic);
#ifdef CONFIG_ZLIB
inflateEnd(&(c->zstream));
#endif
return 0;
}
/*
*
* Uninit lcl encoder
*
*/
static int encode_end(AVCodecContext *avctx)
{
LclContext *c = avctx->priv_data;
av_freep(&avctx->extradata);
av_freep(&c->comp_buf);
#ifdef CONFIG_ZLIB
deflateEnd(&(c->zstream));
#endif
return 0;
}
AVCodec mszh_decoder = {
"mszh",
CODEC_TYPE_VIDEO,
CODEC_ID_MSZH,
sizeof(LclContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_DR1,
};
AVCodec zlib_decoder = {
"zlib",
CODEC_TYPE_VIDEO,
CODEC_ID_ZLIB,
sizeof(LclContext),
decode_init,
NULL,
decode_end,
decode_frame,
CODEC_CAP_DR1,
};
#ifdef CONFIG_ENCODERS
AVCodec zlib_encoder = {
"zlib",
CODEC_TYPE_VIDEO,
CODEC_ID_ZLIB,
sizeof(LclContext),
encode_init,
encode_frame,
encode_end,
};
#endif //CONFIG_ENCODERS
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