| /* | |
| * 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 "codec_internal.h" | |
| #include "decode.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 || FFMAX(avctx->width, avctx->height) >= (1<<16)) | |
| 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; | |
| unsigned 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; | |
| if ((width | height) & 1) | |
| return AVERROR_INVALIDDATA; | |
| 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 (width < 4 || frame_end - frame < width + 4) | |
| 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; | |
| int64_t delta = -((int16_t)segments * (int64_t)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][5] = { | |
| "COPY", "TSW1", "BDLT", "WDLT", "TDLT", "DSW1", "BLCK", "DDS1" | |
| }; | |
| static int dfa_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| int *got_frame, AVPacket *avpkt) | |
| { | |
| 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) { | |
| if (bytestream2_get_bytes_left(&gb) < 12) | |
| return AVERROR_INVALIDDATA; | |
| 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; | |
| } | |
| #if FF_API_PALETTE_HAS_CHANGED | |
| FF_DISABLE_DEPRECATION_WARNINGS | |
| frame->palette_has_changed = 1; | |
| FF_ENABLE_DEPRECATION_WARNINGS | |
| #endif | |
| } 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]; | |
| if (version == 0x100) { | |
| for (i = 0; i < avctx->height; i++) { | |
| int j; | |
| const uint8_t *buf1 = buf + (i&3)*(avctx->width/4) + (i/4)*avctx->width; | |
| int stride = (avctx->height/4)*avctx->width; | |
| for(j = 0; j < avctx->width/4; j++) { | |
| dst[4*j+0] = buf1[j + 0*stride]; | |
| dst[4*j+1] = buf1[j + 1*stride]; | |
| dst[4*j+2] = buf1[j + 2*stride]; | |
| dst[4*j+3] = buf1[j + 3*stride]; | |
| } | |
| j *= 4; | |
| for(; j < avctx->width; j++) { | |
| dst[j] = buf1[(j/4) + (j&3)*stride]; | |
| } | |
| dst += frame->linesize[0]; | |
| } | |
| } else | |
| av_image_copy_plane(dst, frame->linesize[0], buf, avctx->width, | |
| avctx->width, avctx->height); | |
| 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; | |
| } | |
| const FFCodec ff_dfa_decoder = { | |
| .p.name = "dfa", | |
| CODEC_LONG_NAME("Chronomaster DFA"), | |
| .p.type = AVMEDIA_TYPE_VIDEO, | |
| .p.id = AV_CODEC_ID_DFA, | |
| .priv_data_size = sizeof(DfaContext), | |
| .init = dfa_decode_init, | |
| .close = dfa_decode_end, | |
| FF_CODEC_DECODE_CB(dfa_decode_frame), | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| }; |