diff options
Diffstat (limited to 'libavcodec/nuv.c')
| -rw-r--r-- | libavcodec/nuv.c | 67 |
1 files changed, 41 insertions, 26 deletions
diff --git a/libavcodec/nuv.c b/libavcodec/nuv.c index b3acde4..e0cec52 100644 --- a/libavcodec/nuv.c +++ b/libavcodec/nuv.c @@ -2,25 +2,26 @@ * NuppelVideo decoder * Copyright (c) 2006 Reimar Doeffinger * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <stdio.h> #include <stdlib.h> +#include <limits.h> #include "libavutil/bswap.h" #include "libavutil/common.h" @@ -121,23 +122,26 @@ static int codec_reinit(AVCodecContext *avctx, int width, int height, if (quality >= 0) get_quant_quality(c, quality); if (width != c->width || height != c->height) { - void *ptr; + // also reserve space for a possible additional header + int buf_size = height * width * 3 / 2 + + FFMAX(AV_LZO_OUTPUT_PADDING, FF_INPUT_BUFFER_PADDING_SIZE) + + RTJPEG_HEADER_SIZE; + if (buf_size > INT_MAX/8) + return -1; if ((ret = av_image_check_size(height, width, 0, avctx)) < 0) return ret; avctx->width = c->width = width; avctx->height = c->height = height; - ptr = av_fast_realloc(c->decomp_buf, &c->decomp_size, - c->height * c->width * 3 / 2 + - FF_INPUT_BUFFER_PADDING_SIZE + - RTJPEG_HEADER_SIZE); - if (!ptr) { + av_fast_malloc(&c->decomp_buf, &c->decomp_size, + buf_size); + if (!c->decomp_buf) { av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); return AVERROR(ENOMEM); - } else - c->decomp_buf = ptr; + } ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq); av_frame_unref(c->pic); + return 1; } else if (quality != c->quality) ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq); @@ -153,6 +157,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVFrame *picture = data; int orig_size = buf_size; int keyframe, ret; + int size_change = 0; int result, init_frame = !avctx->frame_number; enum { NUV_UNCOMPRESSED = '0', @@ -181,7 +186,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, return orig_size; } - if (buf[0] != 'V' || buf_size < 12) { + if (buf_size < 12 || buf[0] != 'V') { av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n"); return AVERROR_INVALIDDATA; } @@ -198,24 +203,32 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, keyframe = 1; break; } +retry: // skip rest of the frameheader. buf = &buf[12]; buf_size -= 12; if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) { - int outlen = c->decomp_size - FF_INPUT_BUFFER_PADDING_SIZE; + int outlen = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING); int inlen = buf_size; if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) { av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n"); return AVERROR_INVALIDDATA; } buf = c->decomp_buf; - buf_size = outlen; + buf_size = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen; + memset(c->decomp_buf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); } if (c->codec_frameheader) { int w, h, q; - if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE || - buf[5] != RTJPEG_FILE_VERSION) { - av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n"); + if (buf_size < RTJPEG_HEADER_SIZE) { + av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n"); + return AVERROR_INVALIDDATA; + } + // There seem to exist two variants of this header: one starts with 'V' + // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size, + // 1 byte header size (== 12), 1 byte version (== 0) + if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) { + av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n"); return AVERROR_INVALIDDATA; } w = AV_RL16(&buf[6]); @@ -223,22 +236,23 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, q = buf[10]; if ((result = codec_reinit(avctx, w, h, q)) < 0) return result; - if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) - buf = c->decomp_buf; + if (result) { + buf = avpkt->data; + buf_size = avpkt->size; + size_change = 1; + goto retry; + } buf = &buf[RTJPEG_HEADER_SIZE]; buf_size -= RTJPEG_HEADER_SIZE; } - if (keyframe) { + if (size_change || keyframe) { av_frame_unref(c->pic); init_frame = 1; } - result = ff_reget_buffer(avctx, c->pic); - if (result < 0) { - av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + if ((result = ff_reget_buffer(avctx, c->pic)) < 0) return result; - } if (init_frame) { memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]); memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2); @@ -256,7 +270,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n"); height = buf_size / c->width / 3 * 2; } - copy_frame(c->pic, buf, c->width, height); + if(height > 0) + copy_frame(c->pic, buf, c->width, height); break; } case NUV_RTJPEG_IN_LZO: |
