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Diffstat (limited to 'contrib/ffmpeg/libavcodec/qpeg.c')
-rw-r--r--contrib/ffmpeg/libavcodec/qpeg.c324
1 files changed, 324 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/qpeg.c b/contrib/ffmpeg/libavcodec/qpeg.c
new file mode 100644
index 000000000..3c597e8df
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/qpeg.c
@@ -0,0 +1,324 @@
+/*
+ * QPEG codec
+ * Copyright (c) 2004 Konstantin Shishkov
+ *
+ * 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
+ *
+ */
+
+/**
+ * @file qpeg.c
+ * QPEG codec.
+ */
+
+#include "avcodec.h"
+#include "mpegvideo.h"
+
+typedef struct QpegContext{
+ AVCodecContext *avctx;
+ AVFrame pic;
+ uint8_t *refdata;
+} QpegContext;
+
+static void qpeg_decode_intra(uint8_t *src, uint8_t *dst, int size,
+ int stride, int width, int height)
+{
+ int i;
+ int code;
+ int c0, c1;
+ int run, copy;
+ int filled = 0;
+ int rows_to_go;
+
+ rows_to_go = height;
+ height--;
+ dst = dst + height * stride;
+
+ while((size > 0) && (rows_to_go > 0)) {
+ code = *src++;
+ size--;
+ run = copy = 0;
+ if(code == 0xFC) /* end-of-picture code */
+ break;
+ if(code >= 0xF8) { /* very long run */
+ c0 = *src++;
+ c1 = *src++;
+ size -= 2;
+ run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2;
+ } else if (code >= 0xF0) { /* long run */
+ c0 = *src++;
+ size--;
+ run = ((code & 0xF) << 8) + c0 + 2;
+ } else if (code >= 0xE0) { /* short run */
+ run = (code & 0x1F) + 2;
+ } else if (code >= 0xC0) { /* very long copy */
+ c0 = *src++;
+ c1 = *src++;
+ size -= 2;
+ copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1;
+ } else if (code >= 0x80) { /* long copy */
+ c0 = *src++;
+ size--;
+ copy = ((code & 0x7F) << 8) + c0 + 1;
+ } else { /* short copy */
+ copy = code + 1;
+ }
+
+ /* perform actual run or copy */
+ if(run) {
+ int p;
+
+ p = *src++;
+ size--;
+ for(i = 0; i < run; i++) {
+ dst[filled++] = p;
+ if (filled >= width) {
+ filled = 0;
+ dst -= stride;
+ rows_to_go--;
+ if(rows_to_go <= 0)
+ break;
+ }
+ }
+ } else {
+ size -= copy;
+ for(i = 0; i < copy; i++) {
+ dst[filled++] = *src++;
+ if (filled >= width) {
+ filled = 0;
+ dst -= stride;
+ rows_to_go--;
+ if(rows_to_go <= 0)
+ break;
+ }
+ }
+ }
+ }
+}
+
+static int qpeg_table_h[16] =
+ { 0x00, 0x20, 0x20, 0x20, 0x18, 0x10, 0x10, 0x20, 0x10, 0x08, 0x18, 0x08, 0x08, 0x18, 0x10, 0x04};
+static int qpeg_table_w[16] =
+ { 0x00, 0x20, 0x18, 0x08, 0x18, 0x10, 0x20, 0x10, 0x08, 0x10, 0x20, 0x20, 0x08, 0x10, 0x18, 0x04};
+
+/* Decodes delta frames */
+static void qpeg_decode_inter(uint8_t *src, uint8_t *dst, int size,
+ int stride, int width, int height,
+ int delta, uint8_t *ctable, uint8_t *refdata)
+{
+ int i, j;
+ int code;
+ int filled = 0;
+ int orig_height;
+ uint8_t *blkdata;
+
+ /* copy prev frame */
+ for(i = 0; i < height; i++)
+ memcpy(refdata + (i * width), dst + (i * stride), width);
+
+ orig_height = height;
+ blkdata = src - 0x86;
+ height--;
+ dst = dst + height * stride;
+
+ while((size > 0) && (height >= 0)) {
+ code = *src++;
+ size--;
+
+ if(delta) {
+ /* motion compensation */
+ while((code & 0xF0) == 0xF0) {
+ if(delta == 1) {
+ int me_idx;
+ int me_w, me_h, me_x, me_y;
+ uint8_t *me_plane;
+ int corr, val;
+
+ /* get block size by index */
+ me_idx = code & 0xF;
+ me_w = qpeg_table_w[me_idx];
+ me_h = qpeg_table_h[me_idx];
+
+ /* extract motion vector */
+ corr = *src++;
+ size--;
+
+ val = corr >> 4;
+ if(val > 7)
+ val -= 16;
+ me_x = val;
+
+ val = corr & 0xF;
+ if(val > 7)
+ val -= 16;
+ me_y = val;
+
+ /* check motion vector */
+ if ((me_x + filled < 0) || (me_x + me_w + filled > width) ||
+ (height - me_y - me_h < 0) || (height - me_y > orig_height) ||
+ (filled + me_w > width) || (height - me_h < 0))
+ av_log(NULL, AV_LOG_ERROR, "Bogus motion vector (%i,%i), block size %ix%i at %i,%i\n",
+ me_x, me_y, me_w, me_h, filled, height);
+ else {
+ /* do motion compensation */
+ me_plane = refdata + (filled + me_x) + (height - me_y) * width;
+ for(j = 0; j < me_h; j++) {
+ for(i = 0; i < me_w; i++)
+ dst[filled + i - (j * stride)] = me_plane[i - (j * width)];
+ }
+ }
+ }
+ code = *src++;
+ size--;
+ }
+ }
+
+ if(code == 0xE0) /* end-of-picture code */
+ break;
+ if(code > 0xE0) { /* run code: 0xE1..0xFF */
+ int p;
+
+ code &= 0x1F;
+ p = *src++;
+ size--;
+ for(i = 0; i <= code; i++) {
+ dst[filled++] = p;
+ if(filled >= width) {
+ filled = 0;
+ dst -= stride;
+ height--;
+ }
+ }
+ } else if(code >= 0xC0) { /* copy code: 0xC0..0xDF */
+ code &= 0x1F;
+
+ for(i = 0; i <= code; i++) {
+ dst[filled++] = *src++;
+ if(filled >= width) {
+ filled = 0;
+ dst -= stride;
+ height--;
+ }
+ }
+ size -= code + 1;
+ } else if(code >= 0x80) { /* skip code: 0x80..0xBF */
+ int skip;
+
+ code &= 0x3F;
+ /* codes 0x80 and 0x81 are actually escape codes,
+ skip value minus constant is in the next byte */
+ if(!code)
+ skip = (*src++) + 64;
+ else if(code == 1)
+ skip = (*src++) + 320;
+ else
+ skip = code;
+ filled += skip;
+ while( filled >= width) {
+ filled -= width;
+ dst -= stride;
+ height--;
+ if(height < 0)
+ break;
+ }
+ } else {
+ /* zero code treated as one-pixel skip */
+ if(code)
+ dst[filled++] = ctable[code & 0x7F];
+ else
+ filled++;
+ if(filled >= width) {
+ filled = 0;
+ dst -= stride;
+ height--;
+ }
+ }
+ }
+}
+
+static int decode_frame(AVCodecContext *avctx,
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
+{
+ QpegContext * const a = avctx->priv_data;
+ AVFrame * const p= (AVFrame*)&a->pic;
+ uint8_t* outdata;
+ int delta;
+
+ if(p->data[0])
+ avctx->release_buffer(avctx, p);
+
+ p->reference= 0;
+ if(avctx->get_buffer(avctx, p) < 0){
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return -1;
+ }
+ outdata = a->pic.data[0];
+ if(buf[0x85] == 0x10) {
+ qpeg_decode_intra(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height);
+ } else {
+ delta = buf[0x85];
+ qpeg_decode_inter(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height, delta, buf + 4, a->refdata);
+ }
+
+ /* make the palette available on the way out */
+ memcpy(a->pic.data[1], a->avctx->palctrl->palette, AVPALETTE_SIZE);
+ if (a->avctx->palctrl->palette_changed) {
+ a->pic.palette_has_changed = 1;
+ a->avctx->palctrl->palette_changed = 0;
+ }
+
+ *data_size = sizeof(AVFrame);
+ *(AVFrame*)data = a->pic;
+
+ return buf_size;
+}
+
+static int decode_init(AVCodecContext *avctx){
+ QpegContext * const a = avctx->priv_data;
+
+ a->avctx = avctx;
+ avctx->pix_fmt= PIX_FMT_PAL8;
+ avctx->has_b_frames = 0;
+ a->pic.data[0] = NULL;
+ a->refdata = av_malloc(avctx->width * avctx->height);
+
+ return 0;
+}
+
+static int decode_end(AVCodecContext *avctx){
+ QpegContext * const a = avctx->priv_data;
+ AVFrame * const p= (AVFrame*)&a->pic;
+
+ if(p->data[0])
+ avctx->release_buffer(avctx, p);
+
+ av_free(a->refdata);
+ return 0;
+}
+
+AVCodec qpeg_decoder = {
+ "qpeg",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_QPEG,
+ sizeof(QpegContext),
+ decode_init,
+ NULL,
+ decode_end,
+ decode_frame,
+ CODEC_CAP_DR1,
+};
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