/* * Zip Motion Blocks Video (ZMBV) decoder * Copyright (c) 2006 Konstantin Shishkov * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * Zip Motion Blocks Video decoder */ #include <stdio.h> #include <stdlib.h> #include "libavutil/common.h" #include "libavutil/intreadwrite.h" #include "avcodec.h" #include "internal.h" #include <zlib.h> #define ZMBV_KEYFRAME 1 #define ZMBV_DELTAPAL 2 enum ZmbvFormat { ZMBV_FMT_NONE = 0, ZMBV_FMT_1BPP = 1, ZMBV_FMT_2BPP = 2, ZMBV_FMT_4BPP = 3, ZMBV_FMT_8BPP = 4, ZMBV_FMT_15BPP = 5, ZMBV_FMT_16BPP = 6, ZMBV_FMT_24BPP = 7, ZMBV_FMT_32BPP = 8 }; /* * Decoder context */ typedef struct ZmbvContext { AVCodecContext *avctx; int bpp; unsigned int decomp_size; uint8_t* decomp_buf; uint8_t pal[768]; uint8_t *prev, *cur; int width, height; int fmt; int comp; int flags; int bw, bh, bx, by; int decomp_len; z_stream zstream; int (*decode_intra)(struct ZmbvContext *c); int (*decode_xor)(struct ZmbvContext *c); } ZmbvContext; /** * Decode XOR'ed frame - 8bpp version */ static int zmbv_decode_xor_8(ZmbvContext *c) { uint8_t *src = c->decomp_buf; uint8_t *output, *prev; int8_t *mvec; int x, y; int d, dx, dy, bw2, bh2; int block; int i, j; int mx, my; output = c->cur; prev = c->prev; if (c->flags & ZMBV_DELTAPAL) { for (i = 0; i < 768; i++) c->pal[i] ^= *src++; } mvec = (int8_t*)src; src += ((c->bx * c->by * 2 + 3) & ~3); block = 0; for (y = 0; y < c->height; y += c->bh) { bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y); for (x = 0; x < c->width; x += c->bw) { uint8_t *out, *tprev; d = mvec[block] & 1; dx = mvec[block] >> 1; dy = mvec[block + 1] >> 1; block += 2; bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x); /* copy block - motion vectors out of bounds are used to zero blocks */ out = output + x; tprev = prev + x + dx + dy * c->width; mx = x + dx; my = y + dy; for (j = 0; j < bh2; j++) { if (my + j < 0 || my + j >= c->height) { memset(out, 0, bw2); } else { for (i = 0; i < bw2; i++) { if (mx + i < 0 || mx + i >= c->width) out[i] = 0; else out[i] = tprev[i]; } } out += c->width; tprev += c->width; } if (d) { /* apply XOR'ed difference */ out = output + x; for (j = 0; j < bh2; j++) { for (i = 0; i < bw2; i++) out[i] ^= *src++; out += c->width; } } } output += c->width * c->bh; prev += c->width * c->bh; } if (src - c->decomp_buf != c->decomp_len) av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len); return 0; } /** * Decode XOR'ed frame - 15bpp and 16bpp version */ static int zmbv_decode_xor_16(ZmbvContext *c) { uint8_t *src = c->decomp_buf; uint16_t *output, *prev; int8_t *mvec; int x, y; int d, dx, dy, bw2, bh2; int block; int i, j; int mx, my; output = (uint16_t*)c->cur; prev = (uint16_t*)c->prev; mvec = (int8_t*)src; src += ((c->bx * c->by * 2 + 3) & ~3); block = 0; for (y = 0; y < c->height; y += c->bh) { bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y); for (x = 0; x < c->width; x += c->bw) { uint16_t *out, *tprev; d = mvec[block] & 1; dx = mvec[block] >> 1; dy = mvec[block + 1] >> 1; block += 2; bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x); /* copy block - motion vectors out of bounds are used to zero blocks */ out = output + x; tprev = prev + x + dx + dy * c->width; mx = x + dx; my = y + dy; for (j = 0; j < bh2; j++) { if (my + j < 0 || my + j >= c->height) { memset(out, 0, bw2 * 2); } else { for (i = 0; i < bw2; i++) { if (mx + i < 0 || mx + i >= c->width) out[i] = 0; else out[i] = tprev[i]; } } out += c->width; tprev += c->width; } if (d) { /* apply XOR'ed difference */ out = output + x; for (j = 0; j < bh2; j++){ for (i = 0; i < bw2; i++) { out[i] ^= *((uint16_t*)src); src += 2; } out += c->width; } } } output += c->width * c->bh; prev += c->width * c->bh; } if (src - c->decomp_buf != c->decomp_len) av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len); return 0; } #ifdef ZMBV_ENABLE_24BPP /** * Decode XOR'ed frame - 24bpp version */ static int zmbv_decode_xor_24(ZmbvContext *c) { uint8_t *src = c->decomp_buf; uint8_t *output, *prev; int8_t *mvec; int x, y; int d, dx, dy, bw2, bh2; int block; int i, j; int mx, my; int stride; output = c->cur; prev = c->prev; stride = c->width * 3; mvec = (int8_t*)src; src += ((c->bx * c->by * 2 + 3) & ~3); block = 0; for (y = 0; y < c->height; y += c->bh) { bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y); for (x = 0; x < c->width; x += c->bw) { uint8_t *out, *tprev; d = mvec[block] & 1; dx = mvec[block] >> 1; dy = mvec[block + 1] >> 1; block += 2; bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x); /* copy block - motion vectors out of bounds are used to zero blocks */ out = output + x * 3; tprev = prev + (x + dx) * 3 + dy * stride; mx = x + dx; my = y + dy; for (j = 0; j < bh2; j++) { if (my + j < 0 || my + j >= c->height) { memset(out, 0, bw2 * 3); } else { for (i = 0; i < bw2; i++){ if (mx + i < 0 || mx + i >= c->width) { out[i * 3 + 0] = 0; out[i * 3 + 1] = 0; out[i * 3 + 2] = 0; } else { out[i * 3 + 0] = tprev[i * 3 + 0]; out[i * 3 + 1] = tprev[i * 3 + 1]; out[i * 3 + 2] = tprev[i * 3 + 2]; } } } out += stride; tprev += stride; } if (d) { /* apply XOR'ed difference */ out = output + x * 3; for (j = 0; j < bh2; j++) { for (i = 0; i < bw2; i++) { out[i * 3 + 0] ^= *src++; out[i * 3 + 1] ^= *src++; out[i * 3 + 2] ^= *src++; } out += stride; } } } output += stride * c->bh; prev += stride * c->bh; } if (src - c->decomp_buf != c->decomp_len) av_log(c->avctx, AV_LOG_ERROR, "Used %i of %i bytes\n", src-c->decomp_buf, c->decomp_len); return 0; } #endif //ZMBV_ENABLE_24BPP /** * Decode XOR'ed frame - 32bpp version */ static int zmbv_decode_xor_32(ZmbvContext *c) { uint8_t *src = c->decomp_buf; uint32_t *output, *prev; int8_t *mvec; int x, y; int d, dx, dy, bw2, bh2; int block; int i, j; int mx, my; output = (uint32_t*)c->cur; prev = (uint32_t*)c->prev; mvec = (int8_t*)src; src += ((c->bx * c->by * 2 + 3) & ~3); block = 0; for (y = 0; y < c->height; y += c->bh) { bh2 = ((c->height - y) > c->bh) ? c->bh : (c->height - y); for (x = 0; x < c->width; x += c->bw) { uint32_t *out, *tprev; d = mvec[block] & 1; dx = mvec[block] >> 1; dy = mvec[block + 1] >> 1; block += 2; bw2 = ((c->width - x) > c->bw) ? c->bw : (c->width - x); /* copy block - motion vectors out of bounds are used to zero blocks */ out = output + x; tprev = prev + x + dx + dy * c->width; mx = x + dx; my = y + dy; for (j = 0; j < bh2; j++) { if (my + j < 0 || my + j >= c->height) { memset(out, 0, bw2 * 4); } else { for (i = 0; i < bw2; i++){ if (mx + i < 0 || mx + i >= c->width) out[i] = 0; else out[i] = tprev[i]; } } out += c->width; tprev += c->width; } if (d) { /* apply XOR'ed difference */ out = output + x; for (j = 0; j < bh2; j++){ for (i = 0; i < bw2; i++) { out[i] ^= *((uint32_t *) src); src += 4; } out += c->width; } } } output += c->width * c->bh; prev += c->width * c->bh; } if (src - c->decomp_buf != c->decomp_len) av_log(c->avctx, AV_LOG_ERROR, "Used %ti of %i bytes\n", src-c->decomp_buf, c->decomp_len); return 0; } /** * Decode intraframe */ static int zmbv_decode_intra(ZmbvContext *c) { uint8_t *src = c->decomp_buf; /* make the palette available on the way out */ if (c->fmt == ZMBV_FMT_8BPP) { memcpy(c->pal, src, 768); src += 768; } memcpy(c->cur, src, c->width * c->height * (c->bpp / 8)); return 0; } 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; ZmbvContext * const c = avctx->priv_data; int zret = Z_OK; // Zlib return code int len = buf_size; int hi_ver, lo_ver, ret; uint8_t *tmp; if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } /* parse header */ c->flags = buf[0]; buf++; len--; if (c->flags & ZMBV_KEYFRAME) { hi_ver = buf[0]; lo_ver = buf[1]; c->comp = buf[2]; c->fmt = buf[3]; c->bw = buf[4]; c->bh = buf[5]; c->decode_intra = NULL; c->decode_xor = NULL; buf += 6; len -= 6; av_log(avctx, AV_LOG_DEBUG, "Flags=%X ver=%i.%i comp=%i fmt=%i blk=%ix%i\n", c->flags,hi_ver,lo_ver,c->comp,c->fmt,c->bw,c->bh); if (hi_ver != 0 || lo_ver != 1) { avpriv_request_sample(avctx, "Version %i.%i", hi_ver, lo_ver); return AVERROR_PATCHWELCOME; } if (c->bw == 0 || c->bh == 0) { avpriv_request_sample(avctx, "Block size %ix%i", c->bw, c->bh); return AVERROR_PATCHWELCOME; } if (c->comp != 0 && c->comp != 1) { avpriv_request_sample(avctx, "Compression type %i", c->comp); return AVERROR_PATCHWELCOME; } switch (c->fmt) { case ZMBV_FMT_8BPP: c->bpp = 8; c->decode_intra = zmbv_decode_intra; c->decode_xor = zmbv_decode_xor_8; break; case ZMBV_FMT_15BPP: case ZMBV_FMT_16BPP: c->bpp = 16; c->decode_intra = zmbv_decode_intra; c->decode_xor = zmbv_decode_xor_16; break; #ifdef ZMBV_ENABLE_24BPP case ZMBV_FMT_24BPP: c->bpp = 24; c->decode_intra = zmbv_decode_intra; c->decode_xor = zmbv_decode_xor_24; break; #endif //ZMBV_ENABLE_24BPP case ZMBV_FMT_32BPP: c->bpp = 32; c->decode_intra = zmbv_decode_intra; c->decode_xor = zmbv_decode_xor_32; break; default: c->decode_intra = NULL; c->decode_xor = NULL; avpriv_request_sample(avctx, "Format %i", c->fmt); return AVERROR_PATCHWELCOME; } zret = inflateReset(&c->zstream); if (zret != Z_OK) { av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret); return AVERROR_UNKNOWN; } tmp = av_realloc(c->cur, avctx->width * avctx->height * (c->bpp / 8)); if (!tmp) return AVERROR(ENOMEM); c->cur = tmp; tmp = av_realloc(c->prev, avctx->width * avctx->height * (c->bpp / 8)); if (!tmp) return AVERROR(ENOMEM); c->prev = tmp; c->bx = (c->width + c->bw - 1) / c->bw; c->by = (c->height + c->bh - 1) / c->bh; } if (!c->decode_intra) { av_log(avctx, AV_LOG_ERROR, "Error! Got no format or no keyframe!\n"); return AVERROR_INVALIDDATA; } if (c->comp == 0) { // uncompressed data if (c->decomp_size < len) { av_log(avctx, AV_LOG_ERROR, "Buffer too small\n"); return AVERROR_INVALIDDATA; } memcpy(c->decomp_buf, buf, len); } else { // ZLIB-compressed data c->zstream.total_in = c->zstream.total_out = 0; c->zstream.next_in = buf; c->zstream.avail_in = len; c->zstream.next_out = c->decomp_buf; c->zstream.avail_out = c->decomp_size; zret = inflate(&c->zstream, Z_SYNC_FLUSH); if (zret != Z_OK && zret != Z_STREAM_END) { av_log(avctx, AV_LOG_ERROR, "inflate error %d\n", zret); return AVERROR_INVALIDDATA; } c->decomp_len = c->zstream.total_out; } if (c->flags & ZMBV_KEYFRAME) { frame->key_frame = 1; frame->pict_type = AV_PICTURE_TYPE_I; c->decode_intra(c); } else { frame->key_frame = 0; frame->pict_type = AV_PICTURE_TYPE_P; if (c->decomp_len) c->decode_xor(c); } /* update frames */ { uint8_t *out, *src; int i, j; out = frame->data[0]; src = c->cur; switch (c->fmt) { case ZMBV_FMT_8BPP: for (j = 0; j < c->height; j++) { for (i = 0; i < c->width; i++) { out[i * 3 + 0] = c->pal[(*src) * 3 + 0]; out[i * 3 + 1] = c->pal[(*src) * 3 + 1]; out[i * 3 + 2] = c->pal[(*src) * 3 + 2]; src++; } out += frame->linesize[0]; } break; case ZMBV_FMT_15BPP: for (j = 0; j < c->height; j++) { for (i = 0; i < c->width; i++) { uint16_t tmp = AV_RL16(src); src += 2; out[i * 3 + 0] = (tmp & 0x7C00) >> 7; out[i * 3 + 1] = (tmp & 0x03E0) >> 2; out[i * 3 + 2] = (tmp & 0x001F) << 3; } out += frame->linesize[0]; } break; case ZMBV_FMT_16BPP: for (j = 0; j < c->height; j++) { for (i = 0; i < c->width; i++) { uint16_t tmp = AV_RL16(src); src += 2; out[i * 3 + 0] = (tmp & 0xF800) >> 8; out[i * 3 + 1] = (tmp & 0x07E0) >> 3; out[i * 3 + 2] = (tmp & 0x001F) << 3; } out += frame->linesize[0]; } break; #ifdef ZMBV_ENABLE_24BPP case ZMBV_FMT_24BPP: for (j = 0; j < c->height; j++) { memcpy(out, src, c->width * 3); src += c->width * 3; out += frame->linesize[0]; } break; #endif //ZMBV_ENABLE_24BPP case ZMBV_FMT_32BPP: for (j = 0; j < c->height; j++) { for (i = 0; i < c->width; i++) { uint32_t tmp = AV_RL32(src); src += 4; AV_WB24(out+(i*3), tmp); } out += frame->linesize[0]; } break; default: av_log(avctx, AV_LOG_ERROR, "Cannot handle format %i\n", c->fmt); } FFSWAP(uint8_t *, c->cur, c->prev); } *got_frame = 1; /* always report that the buffer was completely consumed */ return buf_size; } static av_cold int decode_init(AVCodecContext *avctx) { ZmbvContext * const c = avctx->priv_data; int zret; // Zlib return code c->avctx = avctx; c->width = avctx->width; c->height = avctx->height; c->bpp = avctx->bits_per_coded_sample; // Needed if zlib unused or init aborted before inflateInit memset(&c->zstream, 0, sizeof(z_stream)); avctx->pix_fmt = AV_PIX_FMT_RGB24; c->decomp_size = (avctx->width + 255) * 4 * (avctx->height + 64); /* Allocate decompression buffer */ if (c->decomp_size) { if (!(c->decomp_buf = av_malloc(c->decomp_size))) { av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); return AVERROR(ENOMEM); } } 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 AVERROR_UNKNOWN; } return 0; } static av_cold int decode_end(AVCodecContext *avctx) { ZmbvContext * const c = avctx->priv_data; av_freep(&c->decomp_buf); inflateEnd(&c->zstream); av_freep(&c->cur); av_freep(&c->prev); return 0; } AVCodec ff_zmbv_decoder = { .name = "zmbv", .long_name = NULL_IF_CONFIG_SMALL("Zip Motion Blocks Video"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_ZMBV, .priv_data_size = sizeof(ZmbvContext), .init = decode_init, .close = decode_end, .decode = decode_frame, .capabilities = AV_CODEC_CAP_DR1, };