* 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;
-} PTXContext;
-
-static int ptx_init(AVCodecContext *avctx) {
- PTXContext *s = avctx->priv_data;
-
- avcodec_get_frame_defaults(&s->picture);
- avctx->coded_frame= &s->picture;
-
- return 0;
-}
-
-static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
- uint8_t *buf, int buf_size) {
- PTXContext * const s = avctx->priv_data;
- AVFrame *picture = data;
- AVFrame * const p = &s->picture;
+static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt) {
+ const uint8_t *buf = avpkt->data;
+ const uint8_t *buf_end = avpkt->data + avpkt->size;
+ AVFrame * const p = data;
unsigned int offset, w, h, y, stride, bytes_per_pixel;
+ int ret;
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");
- return -1;
+ avpriv_request_sample(avctx, "Image format not RGB15");
+ return AVERROR_PATCHWELCOME;
}
- 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");
+ avpriv_request_sample(avctx, "offset != 0x2c");
buf += offset;
- if (p->data[0])
- avctx->release_buffer(avctx, p);
+ if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
+ return ret;
- if (avcodec_check_dimensions(avctx, w, h))
- return -1;
- if (w != avctx->width || h != avctx->height)
- avcodec_set_dimensions(avctx, w, h);
- if (avctx->get_buffer(avctx, p) < 0) {
+ if ((ret = ff_get_buffer(avctx, p, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
- return -1;
+ return ret;
}
- 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));
buf += w*bytes_per_pixel;
}
- *picture = s->picture;
- *data_size = sizeof(AVPicture);
+ *got_frame = 1;
- return offset + w*h*bytes_per_pixel;
-}
-
-static int ptx_end(AVCodecContext *avctx) {
- PTXContext *s = avctx->priv_data;
-
- if(s->picture.data[0])
- avctx->release_buffer(avctx, &s->picture);
+ if (y < h) {
+ av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
+ return avpkt->size;
+ }
- return 0;
+ return offset + w*h*bytes_per_pixel;
}
-AVCodec ptx_decoder = {
- "ptx",
- CODEC_TYPE_VIDEO,
- CODEC_ID_PTX,
- sizeof(PTXContext),
- ptx_init,
- NULL,
- ptx_end,
- ptx_decode_frame,
- 0,
- NULL
+AVCodec ff_ptx_decoder = {
+ .name = "ptx",
+ .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_PTX,
+ .decode = ptx_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
};