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Diffstat (limited to 'libavcodec/dfa.c')
-rw-r--r-- | libavcodec/dfa.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/libavcodec/dfa.c b/libavcodec/dfa.c new file mode 100644 index 0000000..6736234 --- /dev/null +++ b/libavcodec/dfa.c @@ -0,0 +1,395 @@ +/* + * 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, offset, count, segments; + + segments = bytestream_get_le32(&src); + frame += bytestream_get_le32(&src); + if (frame < frame_start || frame > frame_end) + return -1; + 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 - offset < frame_start || 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 - offset < frame_start || 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 - offset < frame_start || 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) +{ + const uint8_t *frame_end = frame + width * height; + uint8_t *line_ptr; + int count, lines, segments; + + count = bytestream_get_le16(&src); + if (count >= height || width * count < 0) + return -1; + frame += width * count; + lines = bytestream_get_le16(&src); + if (frame + lines * width > frame_end || src >= src_end) + return -1; + + while (lines--) { + line_ptr = frame; + frame += width; + segments = *src++; + while (segments--) { + if (src_end - src < 3) + return -1; + line_ptr += *src++; + if (line_ptr >= frame) + return -1; + count = (int8_t)*src++; + if (count >= 0) { + if (line_ptr + count > frame || src_end - src < count) + return -1; + bytestream_get_buffer(&src, line_ptr, count); + } else { + count = -count; + if (line_ptr + count > frame || 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 (frame + lines * width > frame_end || src >= src_end) + return -1; + + while (lines--) { + segments = bytestream_get_le16(&src); + while ((segments & 0xC000) == 0xC000) { + frame -= (int16_t)segments * width; + if (frame >= frame_end) + return -1; + 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; + line_ptr += *src++; + if (line_ptr >= frame) + return -1; + count = (int8_t)*src++; + if (count >= 0) { + if (line_ptr + count*2 > frame || src_end - src < count*2) + return -1; + bytestream_get_buffer(&src, line_ptr, count*2); + line_ptr += count * 2; + } else { + count = -count; + if (line_ptr + count*2 > frame || 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"), +}; |