yading@10: /* yading@10: * Chronomaster DFA Video Decoder yading@10: * Copyright (c) 2011 Konstantin Shishkov yading@10: * based on work by Vladimir "VAG" Gneushev yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #include "libavutil/avassert.h" yading@10: #include "avcodec.h" yading@10: #include "bytestream.h" yading@10: #include "internal.h" yading@10: yading@10: #include "libavutil/imgutils.h" yading@10: #include "libavutil/mem.h" yading@10: yading@10: typedef struct DfaContext { yading@10: uint32_t pal[256]; yading@10: uint8_t *frame_buf; yading@10: } DfaContext; yading@10: yading@10: static av_cold int dfa_decode_init(AVCodecContext *avctx) yading@10: { yading@10: DfaContext *s = avctx->priv_data; yading@10: yading@10: avctx->pix_fmt = AV_PIX_FMT_PAL8; yading@10: yading@10: if (!avctx->width || !avctx->height) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: av_assert0(av_image_check_size(avctx->width, avctx->height, 0, avctx) >= 0); yading@10: yading@10: s->frame_buf = av_mallocz(avctx->width * avctx->height); yading@10: if (!s->frame_buf) yading@10: return AVERROR(ENOMEM); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_copy(GetByteContext *gb, uint8_t *frame, int width, int height) yading@10: { yading@10: const int size = width * height; yading@10: yading@10: if (bytestream2_get_buffer(gb, frame, size) != size) yading@10: return AVERROR_INVALIDDATA; yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height) yading@10: { yading@10: const uint8_t *frame_start = frame; yading@10: const uint8_t *frame_end = frame + width * height; yading@10: int mask = 0x10000, bitbuf = 0; yading@10: int v, count, segments; yading@10: unsigned offset; yading@10: yading@10: segments = bytestream2_get_le32(gb); yading@10: offset = bytestream2_get_le32(gb); yading@10: if (segments == 0 && offset == frame_end - frame) yading@10: return 0; // skip frame yading@10: if (frame_end - frame <= offset) yading@10: return AVERROR_INVALIDDATA; yading@10: frame += offset; yading@10: while (segments--) { yading@10: if (bytestream2_get_bytes_left(gb) < 2) yading@10: return AVERROR_INVALIDDATA; yading@10: if (mask == 0x10000) { yading@10: bitbuf = bytestream2_get_le16u(gb); yading@10: mask = 1; yading@10: } yading@10: if (frame_end - frame < 2) yading@10: return AVERROR_INVALIDDATA; yading@10: if (bitbuf & mask) { yading@10: v = bytestream2_get_le16(gb); yading@10: offset = (v & 0x1FFF) << 1; yading@10: count = ((v >> 13) + 2) << 1; yading@10: if (frame - frame_start < offset || frame_end - frame < count) yading@10: return AVERROR_INVALIDDATA; yading@10: av_memcpy_backptr(frame, offset, count); yading@10: frame += count; yading@10: } else { yading@10: *frame++ = bytestream2_get_byte(gb); yading@10: *frame++ = bytestream2_get_byte(gb); yading@10: } yading@10: mask <<= 1; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_dsw1(GetByteContext *gb, uint8_t *frame, int width, int height) yading@10: { yading@10: const uint8_t *frame_start = frame; yading@10: const uint8_t *frame_end = frame + width * height; yading@10: int mask = 0x10000, bitbuf = 0; yading@10: int v, offset, count, segments; yading@10: yading@10: segments = bytestream2_get_le16(gb); yading@10: while (segments--) { yading@10: if (bytestream2_get_bytes_left(gb) < 2) yading@10: return AVERROR_INVALIDDATA; yading@10: if (mask == 0x10000) { yading@10: bitbuf = bytestream2_get_le16u(gb); yading@10: mask = 1; yading@10: } yading@10: if (frame_end - frame < 2) yading@10: return AVERROR_INVALIDDATA; yading@10: if (bitbuf & mask) { yading@10: v = bytestream2_get_le16(gb); yading@10: offset = (v & 0x1FFF) << 1; yading@10: count = ((v >> 13) + 2) << 1; yading@10: if (frame - frame_start < offset || frame_end - frame < count) yading@10: return AVERROR_INVALIDDATA; yading@10: av_memcpy_backptr(frame, offset, count); yading@10: frame += count; yading@10: } else if (bitbuf & (mask << 1)) { yading@10: frame += bytestream2_get_le16(gb); yading@10: } else { yading@10: *frame++ = bytestream2_get_byte(gb); yading@10: *frame++ = bytestream2_get_byte(gb); yading@10: } yading@10: mask <<= 2; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height) yading@10: { yading@10: const uint8_t *frame_start = frame; yading@10: const uint8_t *frame_end = frame + width * height; yading@10: int mask = 0x10000, bitbuf = 0; yading@10: int i, v, offset, count, segments; yading@10: yading@10: segments = bytestream2_get_le16(gb); yading@10: while (segments--) { yading@10: if (bytestream2_get_bytes_left(gb) < 2) yading@10: return AVERROR_INVALIDDATA; yading@10: if (mask == 0x10000) { yading@10: bitbuf = bytestream2_get_le16u(gb); yading@10: mask = 1; yading@10: } yading@10: yading@10: if (bitbuf & mask) { yading@10: v = bytestream2_get_le16(gb); yading@10: offset = (v & 0x1FFF) << 2; yading@10: count = ((v >> 13) + 2) << 1; yading@10: if (frame - frame_start < offset || frame_end - frame < count*2 + width) yading@10: return AVERROR_INVALIDDATA; yading@10: for (i = 0; i < count; i++) { yading@10: frame[0] = frame[1] = yading@10: frame[width] = frame[width + 1] = frame[-offset]; yading@10: yading@10: frame += 2; yading@10: } yading@10: } else if (bitbuf & (mask << 1)) { yading@10: v = bytestream2_get_le16(gb)*2; yading@10: if (frame - frame_end < v) yading@10: return AVERROR_INVALIDDATA; yading@10: frame += v; yading@10: } else { yading@10: if (frame_end - frame < width + 3) yading@10: return AVERROR_INVALIDDATA; yading@10: frame[0] = frame[1] = yading@10: frame[width] = frame[width + 1] = bytestream2_get_byte(gb); yading@10: frame += 2; yading@10: frame[0] = frame[1] = yading@10: frame[width] = frame[width + 1] = bytestream2_get_byte(gb); yading@10: frame += 2; yading@10: } yading@10: mask <<= 2; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_bdlt(GetByteContext *gb, uint8_t *frame, int width, int height) yading@10: { yading@10: uint8_t *line_ptr; yading@10: int count, lines, segments; yading@10: yading@10: count = bytestream2_get_le16(gb); yading@10: if (count >= height) yading@10: return AVERROR_INVALIDDATA; yading@10: frame += width * count; yading@10: lines = bytestream2_get_le16(gb); yading@10: if (count + lines > height) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: while (lines--) { yading@10: if (bytestream2_get_bytes_left(gb) < 1) yading@10: return AVERROR_INVALIDDATA; yading@10: line_ptr = frame; yading@10: frame += width; yading@10: segments = bytestream2_get_byteu(gb); yading@10: while (segments--) { yading@10: if (frame - line_ptr <= bytestream2_peek_byte(gb)) yading@10: return AVERROR_INVALIDDATA; yading@10: line_ptr += bytestream2_get_byte(gb); yading@10: count = (int8_t)bytestream2_get_byte(gb); yading@10: if (count >= 0) { yading@10: if (frame - line_ptr < count) yading@10: return AVERROR_INVALIDDATA; yading@10: if (bytestream2_get_buffer(gb, line_ptr, count) != count) yading@10: return AVERROR_INVALIDDATA; yading@10: } else { yading@10: count = -count; yading@10: if (frame - line_ptr < count) yading@10: return AVERROR_INVALIDDATA; yading@10: memset(line_ptr, bytestream2_get_byte(gb), count); yading@10: } yading@10: line_ptr += count; yading@10: } yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height) yading@10: { yading@10: const uint8_t *frame_end = frame + width * height; yading@10: uint8_t *line_ptr; yading@10: int count, i, v, lines, segments; yading@10: int y = 0; yading@10: yading@10: lines = bytestream2_get_le16(gb); yading@10: if (lines > height) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: while (lines--) { yading@10: if (bytestream2_get_bytes_left(gb) < 2) yading@10: return AVERROR_INVALIDDATA; yading@10: segments = bytestream2_get_le16u(gb); yading@10: while ((segments & 0xC000) == 0xC000) { yading@10: unsigned skip_lines = -(int16_t)segments; yading@10: unsigned delta = -((int16_t)segments * width); yading@10: if (frame_end - frame <= delta || y + lines + skip_lines > height) yading@10: return AVERROR_INVALIDDATA; yading@10: frame += delta; yading@10: y += skip_lines; yading@10: segments = bytestream2_get_le16(gb); yading@10: } yading@10: if (segments & 0x8000) { yading@10: frame[width - 1] = segments & 0xFF; yading@10: segments = bytestream2_get_le16(gb); yading@10: } yading@10: line_ptr = frame; yading@10: if (frame_end - frame < width) yading@10: return AVERROR_INVALIDDATA; yading@10: frame += width; yading@10: y++; yading@10: while (segments--) { yading@10: if (frame - line_ptr <= bytestream2_peek_byte(gb)) yading@10: return AVERROR_INVALIDDATA; yading@10: line_ptr += bytestream2_get_byte(gb); yading@10: count = (int8_t)bytestream2_get_byte(gb); yading@10: if (count >= 0) { yading@10: if (frame - line_ptr < count * 2) yading@10: return AVERROR_INVALIDDATA; yading@10: if (bytestream2_get_buffer(gb, line_ptr, count * 2) != count * 2) yading@10: return AVERROR_INVALIDDATA; yading@10: line_ptr += count * 2; yading@10: } else { yading@10: count = -count; yading@10: if (frame - line_ptr < count * 2) yading@10: return AVERROR_INVALIDDATA; yading@10: v = bytestream2_get_le16(gb); yading@10: for (i = 0; i < count; i++) yading@10: bytestream_put_le16(&line_ptr, v); yading@10: } yading@10: } yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_tdlt(GetByteContext *gb, uint8_t *frame, int width, int height) yading@10: { yading@10: const uint8_t *frame_end = frame + width * height; yading@10: uint32_t segments = bytestream2_get_le32(gb); yading@10: int skip, copy; yading@10: yading@10: while (segments--) { yading@10: if (bytestream2_get_bytes_left(gb) < 2) yading@10: return AVERROR_INVALIDDATA; yading@10: copy = bytestream2_get_byteu(gb) * 2; yading@10: skip = bytestream2_get_byteu(gb) * 2; yading@10: if (frame_end - frame < copy + skip || yading@10: bytestream2_get_bytes_left(gb) < copy) yading@10: return AVERROR_INVALIDDATA; yading@10: frame += skip; yading@10: bytestream2_get_buffer(gb, frame, copy); yading@10: frame += copy; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_blck(GetByteContext *gb, uint8_t *frame, int width, int height) yading@10: { yading@10: memset(frame, 0, width * height); yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: typedef int (*chunk_decoder)(GetByteContext *gb, uint8_t *frame, int width, int height); yading@10: yading@10: static const chunk_decoder decoder[8] = { yading@10: decode_copy, decode_tsw1, decode_bdlt, decode_wdlt, yading@10: decode_tdlt, decode_dsw1, decode_blck, decode_dds1, yading@10: }; yading@10: yading@10: static const char* chunk_name[8] = { yading@10: "COPY", "TSW1", "BDLT", "WDLT", "TDLT", "DSW1", "BLCK", "DDS1" yading@10: }; yading@10: yading@10: static int dfa_decode_frame(AVCodecContext *avctx, yading@10: void *data, int *got_frame, yading@10: AVPacket *avpkt) yading@10: { yading@10: AVFrame *frame = data; yading@10: DfaContext *s = avctx->priv_data; yading@10: GetByteContext gb; yading@10: const uint8_t *buf = avpkt->data; yading@10: uint32_t chunk_type, chunk_size; yading@10: uint8_t *dst; yading@10: int ret; yading@10: int i, pal_elems; yading@10: int version = avctx->extradata_size==2 ? AV_RL16(avctx->extradata) : 0; yading@10: yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: yading@10: bytestream2_init(&gb, avpkt->data, avpkt->size); yading@10: while (bytestream2_get_bytes_left(&gb) > 0) { yading@10: bytestream2_skip(&gb, 4); yading@10: chunk_size = bytestream2_get_le32(&gb); yading@10: chunk_type = bytestream2_get_le32(&gb); yading@10: if (!chunk_type) yading@10: break; yading@10: if (chunk_type == 1) { yading@10: pal_elems = FFMIN(chunk_size / 3, 256); yading@10: for (i = 0; i < pal_elems; i++) { yading@10: s->pal[i] = bytestream2_get_be24(&gb) << 2; yading@10: s->pal[i] |= 0xFFU << 24 | (s->pal[i] >> 6) & 0x30303; yading@10: } yading@10: frame->palette_has_changed = 1; yading@10: } else if (chunk_type <= 9) { yading@10: if (decoder[chunk_type - 2](&gb, s->frame_buf, avctx->width, avctx->height)) { yading@10: av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n", yading@10: chunk_name[chunk_type - 2]); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } else { yading@10: av_log(avctx, AV_LOG_WARNING, "Ignoring unknown chunk type %d\n", yading@10: chunk_type); yading@10: } yading@10: buf += chunk_size; yading@10: } yading@10: yading@10: buf = s->frame_buf; yading@10: dst = frame->data[0]; yading@10: for (i = 0; i < avctx->height; i++) { yading@10: if(version == 0x100) { yading@10: int j; yading@10: for(j = 0; j < avctx->width; j++) { yading@10: dst[j] = buf[ (i&3)*(avctx->width /4) + (j/4) + yading@10: ((j&3)*(avctx->height/4) + (i/4))*avctx->width]; yading@10: } yading@10: } else { yading@10: memcpy(dst, buf, avctx->width); yading@10: buf += avctx->width; yading@10: } yading@10: dst += frame->linesize[0]; yading@10: } yading@10: memcpy(frame->data[1], s->pal, sizeof(s->pal)); yading@10: yading@10: *got_frame = 1; yading@10: yading@10: return avpkt->size; yading@10: } yading@10: yading@10: static av_cold int dfa_decode_end(AVCodecContext *avctx) yading@10: { yading@10: DfaContext *s = avctx->priv_data; yading@10: yading@10: av_freep(&s->frame_buf); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: AVCodec ff_dfa_decoder = { yading@10: .name = "dfa", yading@10: .type = AVMEDIA_TYPE_VIDEO, yading@10: .id = AV_CODEC_ID_DFA, yading@10: .priv_data_size = sizeof(DfaContext), yading@10: .init = dfa_decode_init, yading@10: .close = dfa_decode_end, yading@10: .decode = dfa_decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"), yading@10: };