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Diffstat (limited to 'ffmpeg1/libavcodec/dfa.c')
-rw-r--r--ffmpeg1/libavcodec/dfa.c390
1 files changed, 0 insertions, 390 deletions
diff --git a/ffmpeg1/libavcodec/dfa.c b/ffmpeg1/libavcodec/dfa.c
deleted file mode 100644
index b20cd0e..0000000
--- a/ffmpeg1/libavcodec/dfa.c
+++ /dev/null
@@ -1,390 +0,0 @@
-/*
- * 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 "libavutil/avassert.h"
-#include "avcodec.h"
-#include "bytestream.h"
-#include "internal.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 -1;
- if (segments & 0x8000) {
- frame[width - 1] = segments & 0xFF;
- segments = bytestream2_get_le16(gb);
- }
- line_ptr = frame;
- 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_unk6(GetByteContext *gb, uint8_t *frame, int width, int height)
-{
- return AVERROR_PATCHWELCOME;
-}
-
-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_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 *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;
-
- 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 %d\n",
- chunk_type);
- }
- buf += chunk_size;
- }
-
- buf = s->frame_buf;
- dst = frame->data[0];
- for (i = 0; i < avctx->height; i++) {
- memcpy(dst, buf, avctx->width);
- dst += frame->linesize[0];
- buf += avctx->width;
- }
- 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",
- .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 = CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Chronomaster DFA"),
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 14:46:55 +0000