adding ffmpeg specific version

1 files changed, 390 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/dfa.c b/ffmpeg1/libavcodec/dfa.c
new file mode 100644
index 0000000..b20cd0e
--- /dev/null
+++ b/ffmpeg1/libavcodec/dfa.c
@@ -0,0 +1,390 @@
+/*
+ * 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"),
+};