| /* |
| * LCL (LossLess Codec Library) Codec |
| * Copyright (c) 2002-2004 Roberto Togni |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * 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 "libavutil/mem.h" |
| #include "libavutil/pixdesc.h" |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "internal.h" |
| #include "lcl.h" |
| |
| #if CONFIG_ZLIB_DECODER |
| #include <zlib.h> |
| #endif |
| |
| /* |
| * Decoder context |
| */ |
| typedef struct LclDecContext { |
| // Image type |
| int imgtype; |
| // Compression type |
| int compression; |
| // Flags |
| int flags; |
| // Decompressed data size |
| unsigned int decomp_size; |
| // Decompression buffer |
| unsigned char* decomp_buf; |
| #if CONFIG_ZLIB_DECODER |
| z_stream zstream; |
| #endif |
| } LclDecContext; |
| |
| |
| /** |
| * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes |
| * @param destptr must be padded sufficiently for av_memcpy_backptr |
| */ |
| static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize) |
| { |
| unsigned char *destptr_bak = destptr; |
| unsigned char *destptr_end = destptr + destsize; |
| const unsigned char *srcptr_end = srcptr + srclen; |
| unsigned mask = *srcptr++; |
| unsigned maskbit = 0x80; |
| |
| while (srcptr < srcptr_end && destptr < destptr_end) { |
| if (!(mask & maskbit)) { |
| memcpy(destptr, srcptr, 4); |
| destptr += 4; |
| srcptr += 4; |
| } else { |
| unsigned ofs = bytestream_get_le16(&srcptr); |
| unsigned cnt = (ofs >> 11) + 1; |
| ofs &= 0x7ff; |
| ofs = FFMIN(ofs, destptr - destptr_bak); |
| cnt *= 4; |
| cnt = FFMIN(cnt, destptr_end - destptr); |
| if (ofs) { |
| av_memcpy_backptr(destptr, ofs, cnt); |
| } else { |
| // Not known what the correct behaviour is, but |
| // this at least avoids uninitialized data. |
| memset(destptr, 0, cnt); |
| } |
| destptr += cnt; |
| } |
| maskbit >>= 1; |
| if (!maskbit) { |
| mask = *srcptr++; |
| while (!mask) { |
| if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break; |
| memcpy(destptr, srcptr, 32); |
| destptr += 32; |
| srcptr += 32; |
| mask = *srcptr++; |
| } |
| maskbit = 0x80; |
| } |
| } |
| |
| return destptr - destptr_bak; |
| } |
| |
| |
| #if CONFIG_ZLIB_DECODER |
| /** |
| * @brief decompress a zlib-compressed data block into decomp_buf |
| * @param src compressed input buffer |
| * @param src_len data length in input buffer |
| * @param offset offset in decomp_buf |
| * @param expected expected decompressed length |
| */ |
| static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected) |
| { |
| LclDecContext *c = avctx->priv_data; |
| int zret = inflateReset(&c->zstream); |
| if (zret != Z_OK) { |
| av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret); |
| return AVERROR_UNKNOWN; |
| } |
| c->zstream.next_in = (uint8_t *)src; |
| c->zstream.avail_in = src_len; |
| c->zstream.next_out = c->decomp_buf + offset; |
| c->zstream.avail_out = c->decomp_size - offset; |
| 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 AVERROR_UNKNOWN; |
| } |
| if (expected != (unsigned int)c->zstream.total_out) { |
| av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n", |
| expected, c->zstream.total_out); |
| return AVERROR_UNKNOWN; |
| } |
| return c->zstream.total_out; |
| } |
| #endif |
| |
| |
| /* |
| * |
| * Decode a frame |
| * |
| */ |
| static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) |
| { |
| AVFrame *frame = data; |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| LclDecContext * const c = avctx->priv_data; |
| unsigned int pixel_ptr; |
| int row, col; |
| unsigned char *encoded = avpkt->data, *outptr; |
| uint8_t *y_out, *u_out, *v_out; |
| 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, ret; |
| unsigned int mthread_inlen, mthread_outlen; |
| unsigned int len = buf_size; |
| int linesize; |
| |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| return ret; |
| |
| outptr = frame->data[0]; // Output image pointer |
| |
| /* Decompress frame */ |
| switch (avctx->codec_id) { |
| case AV_CODEC_ID_MSZH: |
| switch (c->compression) { |
| case COMP_MSZH: |
| if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height || |
| c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) { |
| ; |
| } else if (c->flags & FLAG_MULTITHREAD) { |
| mthread_inlen = AV_RL32(buf); |
| if (len < 8) { |
| av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len); |
| return AVERROR_INVALIDDATA; |
| } |
| mthread_inlen = FFMIN(mthread_inlen, len - 8); |
| mthread_outlen = AV_RL32(buf + 4); |
| mthread_outlen = FFMIN(mthread_outlen, c->decomp_size); |
| mszh_dlen = mszh_decomp(buf + 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 AVERROR_INVALIDDATA; |
| } |
| mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - 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 AVERROR_INVALIDDATA; |
| } |
| encoded = c->decomp_buf; |
| len = c->decomp_size; |
| } else { |
| mszh_dlen = mszh_decomp(buf, 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 AVERROR_INVALIDDATA; |
| } |
| encoded = c->decomp_buf; |
| len = mszh_dlen; |
| } |
| break; |
| case COMP_MSZH_NOCOMP: { |
| int bppx2; |
| switch (c->imgtype) { |
| case IMGTYPE_YUV111: |
| case IMGTYPE_RGB24: |
| bppx2 = 6; |
| break; |
| case IMGTYPE_YUV422: |
| case IMGTYPE_YUV211: |
| bppx2 = 4; |
| break; |
| case IMGTYPE_YUV411: |
| case IMGTYPE_YUV420: |
| bppx2 = 3; |
| break; |
| default: |
| bppx2 = 0; // will error out below |
| break; |
| } |
| if (len < ((width * height * bppx2) >> 1)) |
| return AVERROR_INVALIDDATA; |
| break; |
| } |
| default: |
| av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| break; |
| #if CONFIG_ZLIB_DECODER |
| case AV_CODEC_ID_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) { |
| if (c->flags & FLAG_PNGFILTER) { |
| memcpy(c->decomp_buf, buf, len); |
| encoded = c->decomp_buf; |
| } else { |
| break; |
| } |
| } else if (c->flags & FLAG_MULTITHREAD) { |
| mthread_inlen = AV_RL32(buf); |
| mthread_inlen = FFMIN(mthread_inlen, len - 8); |
| mthread_outlen = AV_RL32(buf + 4); |
| mthread_outlen = FFMIN(mthread_outlen, c->decomp_size); |
| ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen); |
| if (ret < 0) return ret; |
| ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen, |
| mthread_outlen, mthread_outlen); |
| if (ret < 0) return ret; |
| } else { |
| int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size); |
| if (ret < 0) return ret; |
| } |
| encoded = c->decomp_buf; |
| len = c->decomp_size; |
| break; |
| #endif |
| default: |
| av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| |
| /* Apply PNG filter */ |
| if (avctx->codec_id == AV_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 = AV_RL16(encoded+pixel_ptr); |
| pixel_ptr += 2; |
| for (col = 1; col < width; col++) { |
| encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; |
| uqvq -= AV_RL16(encoded+pixel_ptr+1); |
| AV_WL16(encoded+pixel_ptr+1, uqvq); |
| 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 AVERROR_INVALIDDATA; |
| } |
| } |
| |
| /* Convert colorspace */ |
| y_out = frame->data[0] + (height - 1) * frame->linesize[0]; |
| u_out = frame->data[1] + (height - 1) * frame->linesize[1]; |
| v_out = frame->data[2] + (height - 1) * frame->linesize[2]; |
| switch (c->imgtype) { |
| case IMGTYPE_YUV111: |
| for (row = 0; row < height; row++) { |
| for (col = 0; col < width; col++) { |
| y_out[col] = *encoded++; |
| u_out[col] = *encoded++ + 128; |
| v_out[col] = *encoded++ + 128; |
| } |
| y_out -= frame->linesize[0]; |
| u_out -= frame->linesize[1]; |
| v_out -= frame->linesize[2]; |
| } |
| break; |
| case IMGTYPE_YUV422: |
| for (row = 0; row < height; row++) { |
| for (col = 0; col < width - 3; col += 4) { |
| memcpy(y_out + col, encoded, 4); |
| encoded += 4; |
| u_out[ col >> 1 ] = *encoded++ + 128; |
| u_out[(col >> 1) + 1] = *encoded++ + 128; |
| v_out[ col >> 1 ] = *encoded++ + 128; |
| v_out[(col >> 1) + 1] = *encoded++ + 128; |
| } |
| y_out -= frame->linesize[0]; |
| u_out -= frame->linesize[1]; |
| v_out -= frame->linesize[2]; |
| } |
| break; |
| case IMGTYPE_RGB24: |
| linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4); |
| for (row = height - 1; row >= 0; row--) { |
| pixel_ptr = row * frame->linesize[0]; |
| memcpy(outptr + pixel_ptr, encoded, 3 * width); |
| encoded += linesize; |
| } |
| break; |
| case IMGTYPE_YUV411: |
| for (row = 0; row < height; row++) { |
| for (col = 0; col < width - 3; col += 4) { |
| memcpy(y_out + col, encoded, 4); |
| encoded += 4; |
| u_out[col >> 2] = *encoded++ + 128; |
| v_out[col >> 2] = *encoded++ + 128; |
| } |
| y_out -= frame->linesize[0]; |
| u_out -= frame->linesize[1]; |
| v_out -= frame->linesize[2]; |
| } |
| break; |
| case IMGTYPE_YUV211: |
| for (row = 0; row < height; row++) { |
| for (col = 0; col < width - 1; col += 2) { |
| memcpy(y_out + col, encoded, 2); |
| encoded += 2; |
| u_out[col >> 1] = *encoded++ + 128; |
| v_out[col >> 1] = *encoded++ + 128; |
| } |
| y_out -= frame->linesize[0]; |
| u_out -= frame->linesize[1]; |
| v_out -= frame->linesize[2]; |
| } |
| break; |
| case IMGTYPE_YUV420: |
| u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1]; |
| v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2]; |
| for (row = 0; row < height - 1; row += 2) { |
| for (col = 0; col < width - 1; col += 2) { |
| memcpy(y_out + col, encoded, 2); |
| encoded += 2; |
| memcpy(y_out + col - frame->linesize[0], encoded, 2); |
| encoded += 2; |
| u_out[col >> 1] = *encoded++ + 128; |
| v_out[col >> 1] = *encoded++ + 128; |
| } |
| y_out -= frame->linesize[0] << 1; |
| u_out -= frame->linesize[1]; |
| v_out -= frame->linesize[2]; |
| } |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| *got_frame = 1; |
| |
| /* always report that the buffer was completely consumed */ |
| return buf_size; |
| } |
| |
| /* |
| * |
| * Init lcl decoder |
| * |
| */ |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| LclDecContext * const c = avctx->priv_data; |
| unsigned int basesize = avctx->width * avctx->height; |
| unsigned int max_basesize = FFALIGN(avctx->width, 4) * |
| FFALIGN(avctx->height, 4); |
| unsigned int max_decomp_size; |
| int subsample_h, subsample_v; |
| |
| if (avctx->extradata_size < 8) { |
| av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* Check codec type */ |
| if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) || |
| (avctx->codec_id == AV_CODEC_ID_ZLIB && 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 = avctx->extradata[4]) { |
| case IMGTYPE_YUV111: |
| c->decomp_size = basesize * 3; |
| max_decomp_size = max_basesize * 3; |
| avctx->pix_fmt = AV_PIX_FMT_YUV444P; |
| av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n"); |
| break; |
| case IMGTYPE_YUV422: |
| c->decomp_size = basesize * 2; |
| max_decomp_size = max_basesize * 2; |
| avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n"); |
| if (avctx->width % 4) { |
| avpriv_request_sample(avctx, "Unsupported dimensions"); |
| return AVERROR_INVALIDDATA; |
| } |
| break; |
| case IMGTYPE_RGB24: |
| c->decomp_size = basesize * 3; |
| max_decomp_size = max_basesize * 3; |
| avctx->pix_fmt = AV_PIX_FMT_BGR24; |
| av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n"); |
| break; |
| case IMGTYPE_YUV411: |
| c->decomp_size = basesize / 2 * 3; |
| max_decomp_size = max_basesize / 2 * 3; |
| avctx->pix_fmt = AV_PIX_FMT_YUV411P; |
| av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n"); |
| break; |
| case IMGTYPE_YUV211: |
| c->decomp_size = basesize * 2; |
| max_decomp_size = max_basesize * 2; |
| avctx->pix_fmt = AV_PIX_FMT_YUV422P; |
| av_log(avctx, AV_LOG_DEBUG, "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; |
| avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n"); |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v); |
| if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) { |
| avpriv_request_sample(avctx, "Unsupported dimensions"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* Detect compression method */ |
| c->compression = (int8_t)avctx->extradata[5]; |
| switch (avctx->codec_id) { |
| case AV_CODEC_ID_MSZH: |
| switch (c->compression) { |
| case COMP_MSZH: |
| av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n"); |
| break; |
| case COMP_MSZH_NOCOMP: |
| c->decomp_size = 0; |
| av_log(avctx, AV_LOG_DEBUG, "No compression.\n"); |
| break; |
| default: |
| av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression); |
| return AVERROR_INVALIDDATA; |
| } |
| break; |
| #if CONFIG_ZLIB_DECODER |
| case AV_CODEC_ID_ZLIB: |
| switch (c->compression) { |
| case COMP_ZLIB_HISPEED: |
| av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n"); |
| break; |
| case COMP_ZLIB_HICOMP: |
| av_log(avctx, AV_LOG_DEBUG, "High compression.\n"); |
| break; |
| case COMP_ZLIB_NORMAL: |
| av_log(avctx, AV_LOG_DEBUG, "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 AVERROR_INVALIDDATA; |
| } |
| av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression); |
| } |
| break; |
| #endif |
| default: |
| av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| /* Allocate decompression buffer */ |
| if (c->decomp_size) { |
| if (!(c->decomp_buf = av_malloc(max_decomp_size))) { |
| av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); |
| return AVERROR(ENOMEM); |
| } |
| } |
| |
| /* Detect flags */ |
| c->flags = avctx->extradata[6]; |
| if (c->flags & FLAG_MULTITHREAD) |
| av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n"); |
| if (c->flags & FLAG_NULLFRAME) |
| av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n"); |
| if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) |
| av_log(avctx, AV_LOG_DEBUG, "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 CONFIG_ZLIB_DECODER |
| if (avctx->codec_id == AV_CODEC_ID_ZLIB) { |
| int zret; |
| 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); |
| av_freep(&c->decomp_buf); |
| return AVERROR_UNKNOWN; |
| } |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| /* |
| * |
| * Uninit lcl decoder |
| * |
| */ |
| static av_cold int decode_end(AVCodecContext *avctx) |
| { |
| LclDecContext * const c = avctx->priv_data; |
| |
| av_freep(&c->decomp_buf); |
| #if CONFIG_ZLIB_DECODER |
| if (avctx->codec_id == AV_CODEC_ID_ZLIB) |
| inflateEnd(&c->zstream); |
| #endif |
| |
| return 0; |
| } |
| |
| #if CONFIG_MSZH_DECODER |
| AVCodec ff_mszh_decoder = { |
| .name = "mszh", |
| .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_MSZH, |
| .priv_data_size = sizeof(LclDecContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
| |
| #if CONFIG_ZLIB_DECODER |
| AVCodec ff_zlib_decoder = { |
| .name = "zlib", |
| .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_ZLIB, |
| .priv_data_size = sizeof(LclDecContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
| #endif |
