| /* |
| * 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 "avcodec.h" |
| #include "libavutil/intreadwrite.h" |
| #include "bytestream.h" |
| #include "libavutil/lzo.h" // for av_memcpy_backptr |
| |
| typedef struct DfaContext { |
| AVFrame pic; |
| |
| 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 = PIX_FMT_PAL8; |
| |
| s->frame_buf = av_mallocz(avctx->width * avctx->height + AV_LZO_OUTPUT_PADDING); |
| if (!s->frame_buf) |
| return AVERROR(ENOMEM); |
| |
| return 0; |
| } |
| |
| static int decode_copy(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end) |
| { |
| const int size = width * height; |
| |
| if (src_end - src < size) |
| return -1; |
| bytestream_get_buffer(&src, frame, size); |
| return 0; |
| } |
| |
| static int decode_tsw1(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end) |
| { |
| 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 = bytestream_get_le32(&src); |
| offset = bytestream_get_le32(&src); |
| if (frame_end - frame <= offset) |
| return -1; |
| frame += offset; |
| while (segments--) { |
| if (mask == 0x10000) { |
| if (src >= src_end) |
| return -1; |
| bitbuf = bytestream_get_le16(&src); |
| mask = 1; |
| } |
| if (src_end - src < 2 || frame_end - frame < 2) |
| return -1; |
| if (bitbuf & mask) { |
| v = bytestream_get_le16(&src); |
| offset = (v & 0x1FFF) << 1; |
| count = ((v >> 13) + 2) << 1; |
| if (frame - frame_start < offset || frame_end - frame < count) |
| return -1; |
| av_memcpy_backptr(frame, offset, count); |
| frame += count; |
| } else { |
| *frame++ = *src++; |
| *frame++ = *src++; |
| } |
| mask <<= 1; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_dsw1(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end) |
| { |
| 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 = bytestream_get_le16(&src); |
| while (segments--) { |
| if (mask == 0x10000) { |
| if (src >= src_end) |
| return -1; |
| bitbuf = bytestream_get_le16(&src); |
| mask = 1; |
| } |
| if (src_end - src < 2 || frame_end - frame < 2) |
| return -1; |
| if (bitbuf & mask) { |
| v = bytestream_get_le16(&src); |
| offset = (v & 0x1FFF) << 1; |
| count = ((v >> 13) + 2) << 1; |
| if (frame - frame_start < offset || frame_end - frame < count) |
| return -1; |
| // can't use av_memcpy_backptr() since it can overwrite following pixels |
| for (v = 0; v < count; v++) |
| frame[v] = frame[v - offset]; |
| frame += count; |
| } else if (bitbuf & (mask << 1)) { |
| frame += bytestream_get_le16(&src); |
| } else { |
| *frame++ = *src++; |
| *frame++ = *src++; |
| } |
| mask <<= 2; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_dds1(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end) |
| { |
| 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 = bytestream_get_le16(&src); |
| while (segments--) { |
| if (mask == 0x10000) { |
| if (src >= src_end) |
| return -1; |
| bitbuf = bytestream_get_le16(&src); |
| mask = 1; |
| } |
| if (src_end - src < 2 || frame_end - frame < 2) |
| return -1; |
| if (bitbuf & mask) { |
| v = bytestream_get_le16(&src); |
| offset = (v & 0x1FFF) << 2; |
| count = ((v >> 13) + 2) << 1; |
| if (frame - frame_start < offset || frame_end - frame < count*2 + width) |
| return -1; |
| for (i = 0; i < count; i++) { |
| frame[0] = frame[1] = |
| frame[width] = frame[width + 1] = frame[-offset]; |
| |
| frame += 2; |
| } |
| } else if (bitbuf & (mask << 1)) { |
| frame += bytestream_get_le16(&src) * 2; |
| } else { |
| frame[0] = frame[1] = |
| frame[width] = frame[width + 1] = *src++; |
| frame += 2; |
| frame[0] = frame[1] = |
| frame[width] = frame[width + 1] = *src++; |
| frame += 2; |
| } |
| mask <<= 2; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_bdlt(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end) |
| { |
| uint8_t *line_ptr; |
| int count, lines, segments; |
| |
| count = bytestream_get_le16(&src); |
| if (count >= height) |
| return -1; |
| frame += width * count; |
| lines = bytestream_get_le16(&src); |
| if (count + lines > height || src >= src_end) |
| return -1; |
| |
| while (lines--) { |
| line_ptr = frame; |
| frame += width; |
| segments = *src++; |
| while (segments--) { |
| if (src_end - src < 3) |
| return -1; |
| if (frame - line_ptr <= *src) |
| return -1; |
| line_ptr += *src++; |
| count = (int8_t)*src++; |
| if (count >= 0) { |
| if (frame - line_ptr < count || src_end - src < count) |
| return -1; |
| bytestream_get_buffer(&src, line_ptr, count); |
| } else { |
| count = -count; |
| if (frame - line_ptr < count || src >= src_end) |
| return -1; |
| memset(line_ptr, *src++, count); |
| } |
| line_ptr += count; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int decode_wdlt(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end) |
| { |
| const uint8_t *frame_end = frame + width * height; |
| uint8_t *line_ptr; |
| int count, i, v, lines, segments; |
| |
| lines = bytestream_get_le16(&src); |
| if (lines > height || src >= src_end) |
| return -1; |
| |
| while (lines--) { |
| segments = bytestream_get_le16(&src); |
| while ((segments & 0xC000) == 0xC000) { |
| unsigned delta = -((int16_t)segments * width); |
| if (frame_end - frame <= delta) |
| return -1; |
| frame += delta; |
| segments = bytestream_get_le16(&src); |
| } |
| if (segments & 0x8000) { |
| frame[width - 1] = segments & 0xFF; |
| segments = bytestream_get_le16(&src); |
| } |
| line_ptr = frame; |
| frame += width; |
| while (segments--) { |
| if (src_end - src < 2) |
| return -1; |
| if (frame - line_ptr <= *src) |
| return -1; |
| line_ptr += *src++; |
| count = (int8_t)*src++; |
| if (count >= 0) { |
| if (frame - line_ptr < count*2 || src_end - src < count*2) |
| return -1; |
| bytestream_get_buffer(&src, line_ptr, count*2); |
| line_ptr += count * 2; |
| } else { |
| count = -count; |
| if (frame - line_ptr < count*2 || src_end - src < 2) |
| return -1; |
| v = bytestream_get_le16(&src); |
| for (i = 0; i < count; i++) |
| bytestream_put_le16(&line_ptr, v); |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int decode_unk6(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end) |
| { |
| return -1; |
| } |
| |
| static int decode_blck(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end) |
| { |
| memset(frame, 0, width * height); |
| return 0; |
| } |
| |
| |
| typedef int (*chunk_decoder)(uint8_t *frame, int width, int height, |
| const uint8_t *src, const uint8_t *src_end); |
| |
| static const chunk_decoder decoder[8] = { |
| decode_copy, decode_tsw1, decode_bdlt, decode_wdlt, |
| decode_unk6, decode_dsw1, decode_blck, decode_dds1, |
| }; |
| |
| static const char* chunk_name[8] = { |
| "COPY", "TSW1", "BDLT", "WDLT", "????", "DSW1", "BLCK", "DDS1" |
| }; |
| |
| static int dfa_decode_frame(AVCodecContext *avctx, |
| void *data, int *data_size, |
| AVPacket *avpkt) |
| { |
| DfaContext *s = avctx->priv_data; |
| const uint8_t *buf = avpkt->data; |
| const uint8_t *buf_end = avpkt->data + avpkt->size; |
| const uint8_t *tmp_buf; |
| uint32_t chunk_type, chunk_size; |
| uint8_t *dst; |
| int ret; |
| int i, pal_elems; |
| |
| if (s->pic.data[0]) |
| avctx->release_buffer(avctx, &s->pic); |
| |
| if ((ret = avctx->get_buffer(avctx, &s->pic))) { |
| av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
| return ret; |
| } |
| |
| while (buf < buf_end) { |
| chunk_size = AV_RL32(buf + 4); |
| chunk_type = AV_RL32(buf + 8); |
| buf += 12; |
| if (buf_end - buf < chunk_size) { |
| av_log(avctx, AV_LOG_ERROR, "Chunk size is too big (%d bytes)\n", chunk_size); |
| return -1; |
| } |
| if (!chunk_type) |
| break; |
| if (chunk_type == 1) { |
| pal_elems = FFMIN(chunk_size / 3, 256); |
| tmp_buf = buf; |
| for (i = 0; i < pal_elems; i++) { |
| s->pal[i] = bytestream_get_be24(&tmp_buf) << 2; |
| s->pal[i] |= (s->pal[i] >> 6) & 0x333; |
| } |
| s->pic.palette_has_changed = 1; |
| } else if (chunk_type <= 9) { |
| if (decoder[chunk_type - 2](s->frame_buf, avctx->width, avctx->height, |
| buf, buf + chunk_size)) { |
| av_log(avctx, AV_LOG_ERROR, "Error decoding %s chunk\n", |
| chunk_name[chunk_type - 2]); |
| return -1; |
| } |
| } else { |
| av_log(avctx, AV_LOG_WARNING, "Ignoring unknown chunk type %d\n", |
| chunk_type); |
| } |
| buf += chunk_size; |
| } |
| |
| buf = s->frame_buf; |
| dst = s->pic.data[0]; |
| for (i = 0; i < avctx->height; i++) { |
| memcpy(dst, buf, avctx->width); |
| dst += s->pic.linesize[0]; |
| buf += avctx->width; |
| } |
| memcpy(s->pic.data[1], s->pal, sizeof(s->pal)); |
| |
| *data_size = sizeof(AVFrame); |
| *(AVFrame*)data = s->pic; |
| |
| return avpkt->size; |
| } |
| |
| static av_cold int dfa_decode_end(AVCodecContext *avctx) |
| { |
| DfaContext *s = avctx->priv_data; |
| |
| if (s->pic.data[0]) |
| avctx->release_buffer(avctx, &s->pic); |
| |
| av_freep(&s->frame_buf); |
| |
| return 0; |
| } |
| |
| AVCodec ff_dfa_decoder = { |
| "dfa", |
| AVMEDIA_TYPE_VIDEO, |
| CODEC_ID_DFA, |
| sizeof(DfaContext), |
| dfa_decode_init, |
| NULL, |
| dfa_decode_end, |
| dfa_decode_frame, |
| CODEC_CAP_DR1, |
| .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"), |
| }; |
