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3e2f200237
When there is just 1 byte remanining in the buffer, nothing will be read and the loop will continue forever. Check that there are at least 8 bytes, which are always read at the beginning. CC:libav-stable@libav.org
239 lines
8.5 KiB
C
239 lines
8.5 KiB
C
/*
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* Copyright (C) 2003 the ffmpeg project
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* id RoQ Video Decoder by Dr. Tim Ferguson
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* For more information about the id RoQ format, visit:
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* http://www.csse.monash.edu.au/~timf/
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "roqvideo.h"
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static void roqvideo_decode_frame(RoqContext *ri)
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{
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unsigned int chunk_id = 0, chunk_arg = 0;
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unsigned long chunk_size = 0;
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int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
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int vqid, xpos, ypos, xp, yp, x, y, mx, my;
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int frame_stats[2][4] = {{0},{0}};
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roq_qcell *qcell;
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int64_t chunk_start;
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while (bytestream2_get_bytes_left(&ri->gb) >= 8) {
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chunk_id = bytestream2_get_le16(&ri->gb);
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chunk_size = bytestream2_get_le32(&ri->gb);
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chunk_arg = bytestream2_get_le16(&ri->gb);
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if(chunk_id == RoQ_QUAD_VQ)
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break;
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if(chunk_id == RoQ_QUAD_CODEBOOK) {
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if((nv1 = chunk_arg >> 8) == 0)
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nv1 = 256;
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if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
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nv2 = 256;
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for(i = 0; i < nv1; i++) {
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ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
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ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
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ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
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ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
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ri->cb2x2[i].u = bytestream2_get_byte(&ri->gb);
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ri->cb2x2[i].v = bytestream2_get_byte(&ri->gb);
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}
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for(i = 0; i < nv2; i++)
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for(j = 0; j < 4; j++)
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ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
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}
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}
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chunk_start = bytestream2_tell(&ri->gb);
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xpos = ypos = 0;
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while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
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for (yp = ypos; yp < ypos + 16; yp += 8)
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for (xp = xpos; xp < xpos + 16; xp += 8) {
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if (vqflg_pos < 0) {
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vqflg = bytestream2_get_le16(&ri->gb);
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vqflg_pos = 7;
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}
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vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
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frame_stats[0][vqid]++;
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vqflg_pos--;
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switch(vqid) {
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case RoQ_ID_MOT:
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break;
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case RoQ_ID_FCC: {
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int byte = bytestream2_get_byte(&ri->gb);
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mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
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my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
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ff_apply_motion_8x8(ri, xp, yp, mx, my);
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break;
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}
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case RoQ_ID_SLD:
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qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
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ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
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ff_apply_vector_4x4(ri, xp + 4, yp, ri->cb2x2 + qcell->idx[1]);
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ff_apply_vector_4x4(ri, xp, yp + 4, ri->cb2x2 + qcell->idx[2]);
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ff_apply_vector_4x4(ri, xp + 4, yp + 4, ri->cb2x2 + qcell->idx[3]);
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break;
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case RoQ_ID_CCC:
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for (k = 0; k < 4; k++) {
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x = xp; y = yp;
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if(k & 0x01) x += 4;
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if(k & 0x02) y += 4;
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if (vqflg_pos < 0) {
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vqflg = bytestream2_get_le16(&ri->gb);
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vqflg_pos = 7;
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}
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vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
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frame_stats[1][vqid]++;
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vqflg_pos--;
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switch(vqid) {
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case RoQ_ID_MOT:
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break;
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case RoQ_ID_FCC: {
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int byte = bytestream2_get_byte(&ri->gb);
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mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
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my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
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ff_apply_motion_4x4(ri, x, y, mx, my);
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break;
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}
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case RoQ_ID_SLD:
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qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
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ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
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ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + qcell->idx[1]);
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ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + qcell->idx[2]);
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ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + qcell->idx[3]);
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break;
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case RoQ_ID_CCC:
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ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
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ff_apply_vector_2x2(ri, x + 2, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
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ff_apply_vector_2x2(ri, x, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
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ff_apply_vector_2x2(ri, x + 2, y + 2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
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break;
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}
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}
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break;
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default:
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av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %d\n", vqid);
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}
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}
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xpos += 16;
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if (xpos >= ri->width) {
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xpos -= ri->width;
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ypos += 16;
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}
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if(ypos >= ri->height)
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break;
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}
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}
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static av_cold int roq_decode_init(AVCodecContext *avctx)
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{
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RoqContext *s = avctx->priv_data;
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s->avctx = avctx;
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if (avctx->width % 16 || avctx->height % 16) {
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av_log(avctx, AV_LOG_ERROR,
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"Dimensions must be a multiple of 16\n");
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return AVERROR_PATCHWELCOME;
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}
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s->width = avctx->width;
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s->height = avctx->height;
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s->last_frame = av_frame_alloc();
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s->current_frame = av_frame_alloc();
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if (!s->current_frame || !s->last_frame) {
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av_frame_free(&s->current_frame);
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av_frame_free(&s->last_frame);
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return AVERROR(ENOMEM);
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}
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avctx->pix_fmt = AV_PIX_FMT_YUV444P;
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return 0;
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}
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static int roq_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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RoqContext *s = avctx->priv_data;
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int copy= !s->current_frame->data[0];
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int ret;
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if ((ret = ff_reget_buffer(avctx, s->current_frame)) < 0) {
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av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failed\n");
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return ret;
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}
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if(copy)
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av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
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avctx->pix_fmt, avctx->width, avctx->height);
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bytestream2_init(&s->gb, buf, buf_size);
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roqvideo_decode_frame(s);
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if ((ret = av_frame_ref(data, s->current_frame)) < 0)
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return ret;
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*got_frame = 1;
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/* shuffle frames */
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FFSWAP(AVFrame *, s->current_frame, s->last_frame);
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return buf_size;
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}
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static av_cold int roq_decode_end(AVCodecContext *avctx)
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{
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RoqContext *s = avctx->priv_data;
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av_frame_free(&s->current_frame);
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av_frame_free(&s->last_frame);
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return 0;
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}
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AVCodec ff_roq_decoder = {
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.name = "roqvideo",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_ROQ,
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.priv_data_size = sizeof(RoqContext),
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.init = roq_decode_init,
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.close = roq_decode_end,
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.decode = roq_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("id RoQ video"),
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};
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