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Diffstat (limited to 'ffmpeg/libavcodec/roqvideodec.c')
-rw-r--r--ffmpeg/libavcodec/roqvideodec.c247
1 files changed, 247 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/roqvideodec.c b/ffmpeg/libavcodec/roqvideodec.c
new file mode 100644
index 0000000..85fdab7
--- /dev/null
+++ b/ffmpeg/libavcodec/roqvideodec.c
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * 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
+ * id RoQ Video Decoder by Dr. Tim Ferguson
+ * For more information about the id RoQ format, visit:
+ * http://www.csse.monash.edu.au/~timf/
+ */
+
+#include "libavutil/avassert.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+#include "roqvideo.h"
+
+static void roqvideo_decode_frame(RoqContext *ri)
+{
+ unsigned int chunk_id = 0, chunk_arg = 0;
+ unsigned long chunk_size = 0;
+ int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
+ int vqid, xpos, ypos, xp, yp, x, y, mx, my;
+ int frame_stats[2][4] = {{0},{0}};
+ roq_qcell *qcell;
+ int64_t chunk_start;
+
+ while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
+ chunk_id = bytestream2_get_le16(&ri->gb);
+ chunk_size = bytestream2_get_le32(&ri->gb);
+ chunk_arg = bytestream2_get_le16(&ri->gb);
+
+ if(chunk_id == RoQ_QUAD_VQ)
+ break;
+ if(chunk_id == RoQ_QUAD_CODEBOOK) {
+ if((nv1 = chunk_arg >> 8) == 0)
+ nv1 = 256;
+ if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
+ nv2 = 256;
+ for(i = 0; i < nv1; i++) {
+ ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
+ ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
+ ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
+ ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
+ ri->cb2x2[i].u = bytestream2_get_byte(&ri->gb);
+ ri->cb2x2[i].v = bytestream2_get_byte(&ri->gb);
+ }
+ for(i = 0; i < nv2; i++)
+ for(j = 0; j < 4; j++)
+ ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
+ }
+ }
+
+ chunk_start = bytestream2_tell(&ri->gb);
+ xpos = ypos = 0;
+
+ if (chunk_size > bytestream2_get_bytes_left(&ri->gb)) {
+ av_log(ri->avctx, AV_LOG_ERROR, "Chunk does not fit in input buffer\n");
+ chunk_size = bytestream2_get_bytes_left(&ri->gb);
+ }
+
+ while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
+ for (yp = ypos; yp < ypos + 16; yp += 8)
+ for (xp = xpos; xp < xpos + 16; xp += 8) {
+ if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
+ av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
+ return;
+ }
+ if (vqflg_pos < 0) {
+ vqflg = bytestream2_get_le16(&ri->gb);
+ vqflg_pos = 7;
+ }
+ vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
+ frame_stats[0][vqid]++;
+ vqflg_pos--;
+
+ switch(vqid) {
+ case RoQ_ID_MOT:
+ break;
+ case RoQ_ID_FCC: {
+ int byte = bytestream2_get_byte(&ri->gb);
+ mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
+ my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
+ ff_apply_motion_8x8(ri, xp, yp, mx, my);
+ break;
+ }
+ case RoQ_ID_SLD:
+ qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
+ ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
+ ff_apply_vector_4x4(ri, xp + 4, yp, ri->cb2x2 + qcell->idx[1]);
+ ff_apply_vector_4x4(ri, xp, yp + 4, ri->cb2x2 + qcell->idx[2]);
+ ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
+ break;
+ case RoQ_ID_CCC:
+ for (k = 0; k < 4; k++) {
+ x = xp; y = yp;
+ if(k & 0x01) x += 4;
+ if(k & 0x02) y += 4;
+
+ if (bytestream2_tell(&ri->gb) >= chunk_start + chunk_size) {
+ av_log(ri->avctx, AV_LOG_ERROR, "Input buffer too small\n");
+ return;
+ }
+ if (vqflg_pos < 0) {
+ vqflg = bytestream2_get_le16(&ri->gb);
+ vqflg_pos = 7;
+ }
+ vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
+ frame_stats[1][vqid]++;
+ vqflg_pos--;
+ switch(vqid) {
+ case RoQ_ID_MOT:
+ break;
+ case RoQ_ID_FCC: {
+ int byte = bytestream2_get_byte(&ri->gb);
+ mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
+ my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
+ ff_apply_motion_4x4(ri, x, y, mx, my);
+ break;
+ }
+ case RoQ_ID_SLD:
+ qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
+ ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
+ ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]);
+ ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]);
+ ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
+ break;
+ case RoQ_ID_CCC:
+ ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
+ ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
+ ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
+ ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
+ break;
+ }
+ }
+ break;
+ default:
+ av_assert2(0);
+ }
+ }
+
+ xpos += 16;
+ if (xpos >= ri->width) {
+ xpos -= ri->width;
+ ypos += 16;
+ }
+ if(ypos >= ri->height)
+ break;
+ }
+}
+
+
+static av_cold int roq_decode_init(AVCodecContext *avctx)
+{
+ RoqContext *s = avctx->priv_data;
+
+ s->avctx = avctx;
+
+ if (avctx->width % 16 || avctx->height % 16) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Dimensions must be a multiple of 16\n");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ s->width = avctx->width;
+ s->height = avctx->height;
+
+ s->last_frame = av_frame_alloc();
+ s->current_frame = av_frame_alloc();
+ if (!s->current_frame || !s->last_frame) {
+ av_frame_free(&s->current_frame);
+ av_frame_free(&s->last_frame);
+ return AVERROR(ENOMEM);
+ }
+
+ avctx->pix_fmt = AV_PIX_FMT_YUV444P;
+
+ return 0;
+}
+
+static int roq_decode_frame(AVCodecContext *avctx,
+ void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ RoqContext *s = avctx->priv_data;
+ int copy= !s->current_frame->data[0];
+ int ret;
+
+ if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0)
+ return ret;
+
+ if(copy)
+ av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
+ avctx->pix_fmt, avctx->width, avctx->height);
+
+ bytestream2_init(&s->gb, buf, buf_size);
+ roqvideo_decode_frame(s);
+
+ if ((ret = av_frame_ref(data, s->current_frame)) < 0)
+ return ret;
+ *got_frame = 1;
+
+ /* shuffle frames */
+ FFSWAP(AVFrame *, s->current_frame, s->last_frame);
+
+ return buf_size;
+}
+
+static av_cold int roq_decode_end(AVCodecContext *avctx)
+{
+ RoqContext *s = avctx->priv_data;
+
+ av_frame_free(&s->current_frame);
+ av_frame_free(&s->last_frame);
+
+ return 0;
+}
+
+AVCodec ff_roq_decoder = {
+ .name = "roqvideo",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_ROQ,
+ .priv_data_size = sizeof(RoqContext),
+ .init = roq_decode_init,
+ .close = roq_decode_end,
+ .decode = roq_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
+};
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