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-rw-r--r--ffmpeg/libavcodec/eatgq.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/eatgq.c b/ffmpeg/libavcodec/eatgq.c
new file mode 100644
index 0000000..cf93c06
--- /dev/null
+++ b/ffmpeg/libavcodec/eatgq.c
@@ -0,0 +1,252 @@
+/*
+ * Electronic Arts TGQ Video Decoder
+ * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
+ *
+ * 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 St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Electronic Arts TGQ Video Decoder
+ * @author Peter Ross <pross@xvid.org>
+ *
+ * Technical details here:
+ * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGQ
+ */
+
+#include "avcodec.h"
+#define BITSTREAM_READER_LE
+#include "get_bits.h"
+#include "bytestream.h"
+#include "dsputil.h"
+#include "aandcttab.h"
+#include "eaidct.h"
+#include "internal.h"
+
+typedef struct TgqContext {
+ AVCodecContext *avctx;
+ int width, height;
+ ScanTable scantable;
+ int qtable[64];
+ DECLARE_ALIGNED(16, int16_t, block)[6][64];
+ GetByteContext gb;
+} TgqContext;
+
+static av_cold int tgq_decode_init(AVCodecContext *avctx)
+{
+ TgqContext *s = avctx->priv_data;
+ uint8_t idct_permutation[64];
+ s->avctx = avctx;
+ ff_init_scantable_permutation(idct_permutation, FF_NO_IDCT_PERM);
+ ff_init_scantable(idct_permutation, &s->scantable, ff_zigzag_direct);
+ avctx->time_base = (AVRational){1, 15};
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ return 0;
+}
+
+static void tgq_decode_block(TgqContext *s, int16_t block[64], GetBitContext *gb)
+{
+ uint8_t *perm = s->scantable.permutated;
+ int i, j, value;
+ block[0] = get_sbits(gb, 8) * s->qtable[0];
+ for (i = 1; i < 64;) {
+ switch (show_bits(gb, 3)) {
+ case 4:
+ block[perm[i++]] = 0;
+ case 0:
+ block[perm[i++]] = 0;
+ skip_bits(gb, 3);
+ break;
+ case 5:
+ case 1:
+ skip_bits(gb, 2);
+ value = get_bits(gb, 6);
+ for (j = 0; j < value; j++)
+ block[perm[i++]] = 0;
+ break;
+ case 6:
+ skip_bits(gb, 3);
+ block[perm[i]] = -s->qtable[perm[i]];
+ i++;
+ break;
+ case 2:
+ skip_bits(gb, 3);
+ block[perm[i]] = s->qtable[perm[i]];
+ i++;
+ break;
+ case 7: // 111b
+ case 3: // 011b
+ skip_bits(gb, 2);
+ if (show_bits(gb, 6) == 0x3F) {
+ skip_bits(gb, 6);
+ block[perm[i]] = get_sbits(gb, 8) * s->qtable[perm[i]];
+ } else {
+ block[perm[i]] = get_sbits(gb, 6) * s->qtable[perm[i]];
+ }
+ i++;
+ break;
+ }
+ }
+ block[0] += 128 << 4;
+}
+
+static void tgq_idct_put_mb(TgqContext *s, int16_t (*block)[64], AVFrame *frame,
+ int mb_x, int mb_y)
+{
+ int linesize = frame->linesize[0];
+ uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
+ uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
+ uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
+
+ ff_ea_idct_put_c(dest_y , linesize, block[0]);
+ ff_ea_idct_put_c(dest_y + 8, linesize, block[1]);
+ ff_ea_idct_put_c(dest_y + 8 * linesize , linesize, block[2]);
+ ff_ea_idct_put_c(dest_y + 8 * linesize + 8, linesize, block[3]);
+ if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
+ ff_ea_idct_put_c(dest_cb, frame->linesize[1], block[4]);
+ ff_ea_idct_put_c(dest_cr, frame->linesize[2], block[5]);
+ }
+}
+
+static inline void tgq_dconly(TgqContext *s, unsigned char *dst,
+ int dst_stride, int dc)
+{
+ int level = av_clip_uint8((dc*s->qtable[0] + 2056) >> 4);
+ int j;
+ for (j = 0; j < 8; j++)
+ memset(dst + j * dst_stride, level, 8);
+}
+
+static void tgq_idct_put_mb_dconly(TgqContext *s, AVFrame *frame,
+ int mb_x, int mb_y, const int8_t *dc)
+{
+ int linesize = frame->linesize[0];
+ uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
+ uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
+ uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
+ tgq_dconly(s, dest_y, linesize, dc[0]);
+ tgq_dconly(s, dest_y + 8, linesize, dc[1]);
+ tgq_dconly(s, dest_y + 8 * linesize, linesize, dc[2]);
+ tgq_dconly(s, dest_y + 8 * linesize + 8, linesize, dc[3]);
+ if (!(s->avctx->flags & CODEC_FLAG_GRAY)) {
+ tgq_dconly(s, dest_cb, frame->linesize[1], dc[4]);
+ tgq_dconly(s, dest_cr, frame->linesize[2], dc[5]);
+ }
+}
+
+static int tgq_decode_mb(TgqContext *s, AVFrame *frame, int mb_y, int mb_x)
+{
+ int mode;
+ int i;
+ int8_t dc[6];
+
+ mode = bytestream2_get_byte(&s->gb);
+ if (mode > 12) {
+ GetBitContext gb;
+ init_get_bits(&gb, s->gb.buffer, FFMIN(bytestream2_get_bytes_left(&s->gb), mode) * 8);
+ for (i = 0; i < 6; i++)
+ tgq_decode_block(s, s->block[i], &gb);
+ tgq_idct_put_mb(s, s->block, frame, mb_x, mb_y);
+ bytestream2_skip(&s->gb, mode);
+ } else {
+ if (mode == 3) {
+ memset(dc, bytestream2_get_byte(&s->gb), 4);
+ dc[4] = bytestream2_get_byte(&s->gb);
+ dc[5] = bytestream2_get_byte(&s->gb);
+ } else if (mode == 6) {
+ bytestream2_get_buffer(&s->gb, dc, 6);
+ } else if (mode == 12) {
+ for (i = 0; i < 6; i++) {
+ dc[i] = bytestream2_get_byte(&s->gb);
+ bytestream2_skip(&s->gb, 1);
+ }
+ } else {
+ av_log(s->avctx, AV_LOG_ERROR, "unsupported mb mode %i\n", mode);
+ return -1;
+ }
+ tgq_idct_put_mb_dconly(s, frame, mb_x, mb_y, dc);
+ }
+ return 0;
+}
+
+static void tgq_calculate_qtable(TgqContext *s, int quant)
+{
+ int i, j;
+ const int a = (14 * (100 - quant)) / 100 + 1;
+ const int b = (11 * (100 - quant)) / 100 + 4;
+ for (j = 0; j < 8; j++)
+ for (i = 0; i < 8; i++)
+ s->qtable[j * 8 + i] = ((a * (j + i) / (7 + 7) + b) *
+ ff_inv_aanscales[j * 8 + i]) >> (14 - 4);
+}
+
+static int tgq_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ TgqContext *s = avctx->priv_data;
+ AVFrame *frame = data;
+ int x, y, ret;
+ int big_endian;
+
+ if (buf_size < 16) {
+ av_log(avctx, AV_LOG_WARNING, "truncated header\n");
+ return AVERROR_INVALIDDATA;
+ }
+ big_endian = AV_RL32(&buf[4]) > 0x000FFFFF;
+ bytestream2_init(&s->gb, buf + 8, buf_size - 8);
+ if (big_endian) {
+ s->width = bytestream2_get_be16u(&s->gb);
+ s->height = bytestream2_get_be16u(&s->gb);
+ } else {
+ s->width = bytestream2_get_le16u(&s->gb);
+ s->height = bytestream2_get_le16u(&s->gb);
+ }
+
+ if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
+ avcodec_set_dimensions(s->avctx, s->width, s->height);
+ }
+ tgq_calculate_qtable(s, bytestream2_get_byteu(&s->gb));
+ bytestream2_skip(&s->gb, 3);
+
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+ return ret;
+ frame->key_frame = 1;
+ frame->pict_type = AV_PICTURE_TYPE_I;
+
+ for (y = 0; y < FFALIGN(avctx->height, 16) >> 4; y++)
+ for (x = 0; x < FFALIGN(avctx->width, 16) >> 4; x++)
+ if (tgq_decode_mb(s, frame, y, x) < 0)
+ return AVERROR_INVALIDDATA;
+
+ *got_frame = 1;
+
+ return avpkt->size;
+}
+
+AVCodec ff_eatgq_decoder = {
+ .name = "eatgq",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_TGQ,
+ .priv_data_size = sizeof(TgqContext),
+ .init = tgq_decode_init,
+ .decode = tgq_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGQ video"),
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 17:36:06 +0000