diff options
author | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2011-11-06 01:34:09 +0400 |
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committer | Reimar Döffinger <Reimar.Doeffinger@gmx.de> | 2011-11-06 02:52:23 +0400 |
commit | 95e1dfee76c9ecdf70037b7e792897bc6e3d460b (patch) | |
tree | bf907fd3d9270e109b79ee1ca08bc050939a89a8 /libavcodec/nuv.c | |
parent | 6f3ebcc320d87e60f738f6cd3ff322c1716c3a93 (diff) |
nuv: Fix combination of size changes and LZO compression.
There were multiple issues, for example might we have to re-run
the decompression when the size of the buffer increased,
we should always use a decompression buffer large enough for
the header (so we do not get stuck when the size is too small).
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Diffstat (limited to 'libavcodec/nuv.c')
-rw-r--r-- | libavcodec/nuv.c | 38 |
1 files changed, 26 insertions, 12 deletions
diff --git a/libavcodec/nuv.c b/libavcodec/nuv.c index b94f5af052..64956f916f 100644 --- a/libavcodec/nuv.c +++ b/libavcodec/nuv.c @@ -20,6 +20,7 @@ */ #include <stdio.h> #include <stdlib.h> +#include <limits.h> #include "libavutil/bswap.h" #include "libavutil/lzo.h" @@ -112,19 +113,23 @@ static int codec_reinit(AVCodecContext *avctx, int width, int height, int qualit if (quality >= 0) get_quant_quality(c, quality); if (width != c->width || height != c->height) { - if (av_image_check_size(height, width, 0, avctx) < 0) - return 0; + // also reserve space for a possible additional header + int buf_size = 24 + height * width * 3 / 2 + AV_LZO_OUTPUT_PADDING; + if (av_image_check_size(height, width, 0, avctx) < 0 || + buf_size > INT_MAX/8) + return -1; avctx->width = c->width = width; avctx->height = c->height = height; - av_fast_malloc(&c->decomp_buf, &c->decomp_size, c->height * c->width * 3 / 2); + 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 0; + return AVERROR(ENOMEM); } rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); + return 1; } else if (quality != c->quality) rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); - return 1; + return 0; } static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, @@ -135,6 +140,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVFrame *picture = data; int orig_size = buf_size; int keyframe; + int size_change = 0; int result; enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1', NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3', @@ -172,18 +178,19 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, default: 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, inlen = buf_size; + int outlen = c->decomp_size - AV_LZO_OUTPUT_PADDING, inlen = buf_size; if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n"); buf = c->decomp_buf; - buf_size = c->decomp_size; + buf_size = c->decomp_size - AV_LZO_OUTPUT_PADDING; } if (c->codec_frameheader) { - int w, h, q; + int w, h, q, res; if (buf[0] != 'V' || buf_size < 12) { av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame (wrong codec_tag?)\n"); return -1; @@ -191,13 +198,20 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, w = AV_RL16(&buf[6]); h = AV_RL16(&buf[8]); q = buf[10]; - if (!codec_reinit(avctx, w, h, q)) - return -1; + res = codec_reinit(avctx, w, h, q); + if (res < 0) + return res; + if (res) { + buf = avpkt->data; + buf_size = avpkt->size; + size_change = 1; + goto retry; + } buf = &buf[12]; buf_size -= 12; } - if (keyframe && c->pic.data[0]) + if ((size_change || keyframe) && c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); c->pic.reference = 3; c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE | @@ -259,7 +273,7 @@ static av_cold int decode_init(AVCodecContext *avctx) { if (avctx->extradata_size) get_quant(avctx, c, avctx->extradata, avctx->extradata_size); dsputil_init(&c->dsp, avctx); - if (!codec_reinit(avctx, avctx->width, avctx->height, -1)) + if (codec_reinit(avctx, avctx->width, avctx->height, -1) < 0) return 1; return 0; } |