| /* |
| * Chronomaster DFA Video Decoder |
| * Copyright (c) 2011 Konstantin Shishkov |
| * based on work by Vladimir "VAG" Gneushev |
| * |
| * 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 |
| */ |
| |
| #include <inttypes.h> |
| |
| #include "avcodec.h" |
| #include "bytestream.h" |
| #include "internal.h" |
| |
| #include "libavutil/avassert.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/mem.h" |
| |
| typedef struct DfaContext { |
| uint32_t pal[256]; |
| uint8_t *frame_buf; |
| } DfaContext; |
| |
| static av_cold int dfa_decode_init(AVCodecContext *avctx) |
| { |
| DfaContext *s = avctx->priv_data; |
| |
| avctx->pix_fmt = AV_PIX_FMT_PAL8; |
| |
| if (!avctx->width || !avctx->height) |
| return AVERROR_INVALIDDATA; |
| |
| av_assert0(av_image_check_size(avctx->width, avctx->height, 0, avctx) >= 0); |
| |
| s->frame_buf = av_mallocz(avctx->width * avctx->height); |
| if (!s->frame_buf) |
| return AVERROR(ENOMEM); |
| |
| return 0; |
| } |
| |
| static int decode_copy(GetByteContext *gb, uint8_t *frame, int width, int height) |
| { |
| const int size = width * height; |
| |
| if (bytestream2_get_buffer(gb, frame, size) != size) |
| return AVERROR_INVALIDDATA; |
| return 0; |
| } |
| |
| static int decode_tsw1(GetByteContext *gb, uint8_t *frame, int width, int height) |
| { |
| const uint8_t *frame_start = frame; |
| const uint8_t *frame_end = frame + width * height; |
| int mask = 0x10000, bitbuf = 0; |
| int v, count, segments; |
| unsigned offset; |
| |
| segments = bytestream2_get_le32(gb); |
| offset = bytestream2_get_le32(gb); |
| if (segments == 0 && offset == frame_end - frame) |
| return 0; // skip frame |
| if (frame_end - frame <= offset) |
| return AVERROR_INVALIDDATA; |
| frame += offset; |
| while (segments--) { |
| if (bytestream2_get_bytes_left(gb) < 2) |
| return AVERROR_INVALIDDATA; |
| if (mask == 0x10000) { |
| bitbuf = bytestream2_get_le16u(gb); |
| mask = 1; |
| } |
| if (frame_end - frame < 2) |
| return AVERROR_INVALIDDATA; |
| if (bitbuf & mask) { |
| v = bytestream2_get_le16(gb); |
| offset = (v & 0x1FFF) << 1; |
| count = ((v >> 13) + 2) << 1; |
| if (frame - frame_start < offset || frame_end - frame < count) |
| return AVERROR_INVALIDDATA; |
| av_memcpy_backptr(frame, offset, count); |
| frame += count; |
| } else { |
| *frame++ = bytestream2_get_byte(gb); |
| *frame++ = bytestream2_get_byte(gb); |
| } |
| mask <<= 1; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_dsw1(GetByteContext *gb, uint8_t *frame, int width, int height) |
| { |
| const uint8_t *frame_start = frame; |
| const uint8_t *frame_end = frame + width * height; |
| int mask = 0x10000, bitbuf = 0; |
| int v, offset, count, segments; |
| |
| segments = bytestream2_get_le16(gb); |
| while (segments--) { |
| if (bytestream2_get_bytes_left(gb) < 2) |
| return AVERROR_INVALIDDATA; |
| if (mask == 0x10000) { |
| bitbuf = bytestream2_get_le16u(gb); |
| mask = 1; |
| } |
| if (frame_end - frame < 2) |
| return AVERROR_INVALIDDATA; |
| if (bitbuf & mask) { |
| v = bytestream2_get_le16(gb); |
| offset = (v & 0x1FFF) << 1; |
| count = ((v >> 13) + 2) << 1; |
| if (frame - frame_start < offset || frame_end - frame < count) |
| return AVERROR_INVALIDDATA; |
| av_memcpy_backptr(frame, offset, count); |
| frame += count; |
| } else if (bitbuf & (mask << 1)) { |
| frame += bytestream2_get_le16(gb); |
| } else { |
| *frame++ = bytestream2_get_byte(gb); |
| *frame++ = bytestream2_get_byte(gb); |
| } |
| mask <<= 2; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_dds1(GetByteContext *gb, uint8_t *frame, int width, int height) |
| { |
| const uint8_t *frame_start = frame; |
| const uint8_t *frame_end = frame + width * height; |
| int mask = 0x10000, bitbuf = 0; |
| int i, v, offset, count, segments; |
| |
| segments = bytestream2_get_le16(gb); |
| while (segments--) { |
| if (bytestream2_get_bytes_left(gb) < 2) |
| return AVERROR_INVALIDDATA; |
| if (mask == 0x10000) { |
| bitbuf = bytestream2_get_le16u(gb); |
| mask = 1; |
| } |
| |
| if (bitbuf & mask) { |
| v = bytestream2_get_le16(gb); |
| offset = (v & 0x1FFF) << 2; |
| count = ((v >> 13) + 2) << 1; |
| if (frame - frame_start < offset || frame_end - frame < count*2 + width) |
| return AVERROR_INVALIDDATA; |
| for (i = 0; i < count; i++) { |
| frame[0] = frame[1] = |
| frame[width] = frame[width + 1] = frame[-offset]; |
| |
| frame += 2; |
| } |
| } else if (bitbuf & (mask << 1)) { |
| v = bytestream2_get_le16(gb)*2; |
| if (frame - frame_end < v) |
| return AVERROR_INVALIDDATA; |
| frame += v; |
| } else { |
| if (frame_end - frame < width + 3) |
| return AVERROR_INVALIDDATA; |
| frame[0] = frame[1] = |
| frame[width] = frame[width + 1] = bytestream2_get_byte(gb); |
| frame += 2; |
| frame[0] = frame[1] = |
| frame[width] = frame[width + 1] = bytestream2_get_byte(gb); |
| frame += 2; |
| } |
| mask <<= 2; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_bdlt(GetByteContext *gb, uint8_t *frame, int width, int height) |
| { |
| uint8_t *line_ptr; |
| int count, lines, segments; |
| |
| count = bytestream2_get_le16(gb); |
| if (count >= height) |
| return AVERROR_INVALIDDATA; |
| frame += width * count; |
| lines = bytestream2_get_le16(gb); |
| if (count + lines > height) |
| return AVERROR_INVALIDDATA; |
| |
| while (lines--) { |
| if (bytestream2_get_bytes_left(gb) < 1) |
| return AVERROR_INVALIDDATA; |
| line_ptr = frame; |
| frame += width; |
| segments = bytestream2_get_byteu(gb); |
| while (segments--) { |
| if (frame - line_ptr <= bytestream2_peek_byte(gb)) |
| return AVERROR_INVALIDDATA; |
| line_ptr += bytestream2_get_byte(gb); |
| count = (int8_t)bytestream2_get_byte(gb); |
| if (count >= 0) { |
| if (frame - line_ptr < count) |
| return AVERROR_INVALIDDATA; |
| if (bytestream2_get_buffer(gb, line_ptr, count) != count) |
| return AVERROR_INVALIDDATA; |
| } else { |
| count = -count; |
| if (frame - line_ptr < count) |
| return AVERROR_INVALIDDATA; |
| memset(line_ptr, bytestream2_get_byte(gb), count); |
| } |
| line_ptr += count; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height) |
| { |
| const uint8_t *frame_end = frame + width * height; |
| uint8_t *line_ptr; |
| int count, i, v, lines, segments; |
| int y = 0; |
| |
| lines = bytestream2_get_le16(gb); |
| if (lines > height) |
| return AVERROR_INVALIDDATA; |
| |
| while (lines--) { |
| if (bytestream2_get_bytes_left(gb) < 2) |
| return AVERROR_INVALIDDATA; |
| segments = bytestream2_get_le16u(gb); |
| while ((segments & 0xC000) == 0xC000) { |
| unsigned skip_lines = -(int16_t)segments; |
| unsigned delta = -((int16_t)segments * width); |
| if (frame_end - frame <= delta || y + lines + skip_lines > height) |
| return AVERROR_INVALIDDATA; |
| frame += delta; |
| y += skip_lines; |
| segments = bytestream2_get_le16(gb); |
| } |
| |
| if (frame_end <= frame) |
| return AVERROR_INVALIDDATA; |
| if (segments & 0x8000) { |
| frame[width - 1] = segments & 0xFF; |
| segments = bytestream2_get_le16(gb); |
| } |
| line_ptr = frame; |
| if (frame_end - frame < width) |
| return AVERROR_INVALIDDATA; |
| frame += width; |
| y++; |
| while (segments--) { |
| if (frame - line_ptr <= bytestream2_peek_byte(gb)) |
| return AVERROR_INVALIDDATA; |
| line_ptr += bytestream2_get_byte(gb); |
| count = (int8_t)bytestream2_get_byte(gb); |
| if (count >= 0) { |
| if (frame - line_ptr < count * 2) |
| return AVERROR_INVALIDDATA; |
| if (bytestream2_get_buffer(gb, line_ptr, count * 2) != count * 2) |
| return AVERROR_INVALIDDATA; |
| line_ptr += count * 2; |
| } else { |
| count = -count; |
| if (frame - line_ptr < count * 2) |
| return AVERROR_INVALIDDATA; |
| v = bytestream2_get_le16(gb); |
| for (i = 0; i < count; i++) |
| bytestream_put_le16(&line_ptr, v); |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int decode_tdlt(GetByteContext *gb, uint8_t *frame, int width, int height) |
| { |
| const uint8_t *frame_end = frame + width * height; |
| uint32_t segments = bytestream2_get_le32(gb); |
| int skip, copy; |
| |
| while (segments--) { |
| if (bytestream2_get_bytes_left(gb) < 2) |
| return AVERROR_INVALIDDATA; |
| copy = bytestream2_get_byteu(gb) * 2; |
| skip = bytestream2_get_byteu(gb) * 2; |
| if (frame_end - frame < copy + skip || |
| bytestream2_get_bytes_left(gb) < copy) |
| return AVERROR_INVALIDDATA; |
| frame += skip; |
| bytestream2_get_buffer(gb, frame, copy); |
| frame += copy; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_blck(GetByteContext *gb, uint8_t *frame, int width, int height) |
| { |
| memset(frame, 0, width * height); |
| return 0; |
| } |
| |
| |
| typedef int (*chunk_decoder)(GetByteContext *gb, uint8_t *frame, int width, int height); |
| |
| static const chunk_decoder decoder[8] = { |
| decode_copy, decode_tsw1, decode_bdlt, decode_wdlt, |
| decode_tdlt, decode_dsw1, decode_blck, decode_dds1, |
| }; |
| |
| static const char* chunk_name[8] = { |
| "COPY", "TSW1", "BDLT", "WDLT", "TDLT", "DSW1", "BLCK", "DDS1" |
| }; |
| |
| static int dfa_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| AVFrame *frame = data; |
| DfaContext *s = avctx->priv_data; |
| GetByteContext gb; |
| const uint8_t *buf = avpkt->data; |
| uint32_t chunk_type, chunk_size; |
| uint8_t *dst; |
| int ret; |
| int i, pal_elems; |
| int version = avctx->extradata_size==2 ? AV_RL16(avctx->extradata) : 0; |
| |
| if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| return ret; |
| |
| bytestream2_init(&gb, avpkt->data, avpkt->size); |
| while (bytestream2_get_bytes_left(&gb) > 0) { |
| bytestream2_skip(&gb, 4); |
| chunk_size = bytestream2_get_le32(&gb); |
| chunk_type = bytestream2_get_le32(&gb); |
| if (!chunk_type) |
| break; |
| if (chunk_type == 1) { |
| pal_elems = FFMIN(chunk_size / 3, 256); |
| for (i = 0; i < pal_elems; i++) { |
| s->pal[i] = bytestream2_get_be24(&gb) << 2; |
| s->pal[i] |= 0xFFU << 24 | (s->pal[i] >> 6) & 0x30303; |
| } |
| frame->palette_has_changed = 1; |
| } else if (chunk_type <= 9) { |
| if (decoder[chunk_type - 2](&gb, s->frame_buf, avctx->width, avctx->height)) { |
| av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n", |
| chunk_name[chunk_type - 2]); |
| return AVERROR_INVALIDDATA; |
| } |
| } else { |
| av_log(avctx, AV_LOG_WARNING, |
| "Ignoring unknown chunk type %"PRIu32"\n", |
| chunk_type); |
| } |
| buf += chunk_size; |
| } |
| |
| buf = s->frame_buf; |
| dst = frame->data[0]; |
| for (i = 0; i < avctx->height; i++) { |
| if(version == 0x100) { |
| int j; |
| for(j = 0; j < avctx->width; j++) { |
| dst[j] = buf[ (i&3)*(avctx->width /4) + (j/4) + |
| ((j&3)*(avctx->height/4) + (i/4))*avctx->width]; |
| } |
| } else { |
| memcpy(dst, buf, avctx->width); |
| buf += avctx->width; |
| } |
| dst += frame->linesize[0]; |
| } |
| memcpy(frame->data[1], s->pal, sizeof(s->pal)); |
| |
| *got_frame = 1; |
| |
| return avpkt->size; |
| } |
| |
| static av_cold int dfa_decode_end(AVCodecContext *avctx) |
| { |
| DfaContext *s = avctx->priv_data; |
| |
| av_freep(&s->frame_buf); |
| |
| return 0; |
| } |
| |
| AVCodec ff_dfa_decoder = { |
| .name = "dfa", |
| .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_DFA, |
| .priv_data_size = sizeof(DfaContext), |
| .init = dfa_decode_init, |
| .close = dfa_decode_end, |
| .decode = dfa_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
