lavc: add a wrapper for AVCodecContext.get_buffer().

[ffmpeg] / libavcodec / ptx.c

diff --git a/libavcodec/ptx.c b/libavcodec/ptx.c
index 294d14eafc20f895a7cd10029b514ccb9f29f43f..c9b356440997c76023673610eff9e69387fbee27 100644 (file)
--- a/libavcodec/ptx.c
+++ b/libavcodec/ptx.c
@@ -2,24 +2,28 @@
  * V.Flash PTX (.ptx) image decoder
  * Copyright (c) 2007 Ivo van Poorten
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/imgutils.h"
 #include "avcodec.h"
+#include "internal.h"
 
 typedef struct PTXContext {
     AVFrame picture;
@@ -35,49 +39,55 @@ static av_cold int ptx_init(AVCodecContext *avctx) {
 }
 
 static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
-                            const uint8_t *buf, int buf_size) {
+                            AVPacket *avpkt) {
+    const uint8_t *buf = avpkt->data;
+    const uint8_t *buf_end = avpkt->data + avpkt->size;
     PTXContext * const s = avctx->priv_data;
     AVFrame *picture = data;
     AVFrame * const p = &s->picture;
     unsigned int offset, w, h, y, stride, bytes_per_pixel;
     uint8_t *ptr;
 
+    if (buf_end - buf < 14)
+        return AVERROR_INVALIDDATA;
     offset          = AV_RL16(buf);
     w               = AV_RL16(buf+8);
     h               = AV_RL16(buf+10);
     bytes_per_pixel = AV_RL16(buf+12) >> 3;
 
     if (bytes_per_pixel != 2) {
-        av_log(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\n");
+        av_log_ask_for_sample(avctx, "Image format is not RGB15.\n");
         return -1;
     }
 
-    avctx->pix_fmt = PIX_FMT_RGB555;
+    avctx->pix_fmt = AV_PIX_FMT_RGB555;
 
+    if (buf_end - buf < offset)
+        return AVERROR_INVALIDDATA;
     if (offset != 0x2c)
-        av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\n");
+        av_log_ask_for_sample(avctx, "offset != 0x2c\n");
 
     buf += offset;
 
     if (p->data[0])
         avctx->release_buffer(avctx, p);
 
-    if (avcodec_check_dimensions(avctx, w, h))
+    if (av_image_check_size(w, h, 0, avctx))
         return -1;
     if (w != avctx->width || h != avctx->height)
         avcodec_set_dimensions(avctx, w, h);
-    if (avctx->get_buffer(avctx, p) < 0) {
+    if (ff_get_buffer(avctx, p) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
 
-    p->pict_type = FF_I_TYPE;
+    p->pict_type = AV_PICTURE_TYPE_I;
 
     ptr    = p->data[0];
     stride = p->linesize[0];
 
-    for (y=0; y<h; y++) {
-#ifdef WORDS_BIGENDIAN
+    for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
+#if HAVE_BIGENDIAN
         unsigned int x;
         for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
             AV_WN16(ptr+x, AV_RL16(buf+x));
@@ -91,6 +101,11 @@ static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     *picture = s->picture;
     *data_size = sizeof(AVPicture);
 
+    if (y < h) {
+        av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
+        return avpkt->size;
+    }
+
     return offset + w*h*bytes_per_pixel;
 }
 
@@ -103,16 +118,14 @@ static av_cold int ptx_end(AVCodecContext *avctx) {
     return 0;
 }
 
-AVCodec ptx_decoder = {
-    "ptx",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_PTX,
-    sizeof(PTXContext),
-    ptx_init,
-    NULL,
-    ptx_end,
-    ptx_decode_frame,
-    0,
-    NULL,
-    .long_name = "V.Flash PTX image",
+AVCodec ff_ptx_decoder = {
+    .name           = "ptx",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_PTX,
+    .priv_data_size = sizeof(PTXContext),
+    .init           = ptx_init,
+    .close          = ptx_end,
+    .decode         = ptx_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
 };