X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=inline;f=libavcodec%2Finterplayvideo.c;h=274641c3d1a90f77b46ebb7a1223f5b7e74659d2;hb=e8344f21e16b7043411830cea99304169127dacf;hp=deaa09cba60ff4e9319bb121c794b1ab8717be20;hpb=768b07e3bca7e81d2f9c60badb3973d3d88481dc;p=ffmpeg

diff --git a/libavcodec/interplayvideo.c b/libavcodec/interplayvideo.c
index deaa09cba60..274641c3d1a 100644
--- a/libavcodec/interplayvideo.c
+++ b/libavcodec/interplayvideo.c
@@ -77,9 +77,14 @@ typedef struct IpvideoContext {
 
 static int copy_from(IpvideoContext *s, AVFrame *src, AVFrame *dst, int delta_x, int delta_y)
 {
+    int width = dst->width;
     int current_offset = s->pixel_ptr - dst->data[0];
-    int motion_offset = current_offset + delta_y * dst->linesize[0]
-                       + delta_x * (1 + s->is_16bpp);
+    int x = (current_offset % dst->linesize[0]) / (1 + s->is_16bpp);
+    int y = current_offset / dst->linesize[0];
+    int dx = delta_x + x - ((delta_x + x >= width) - (delta_x + x < 0)) * width;
+    int dy = delta_y + y + (delta_x + x >= width) - (delta_x + x < 0);
+    int motion_offset = dy * src->linesize[0] + dx * (1 + s->is_16bpp);
+
     if (motion_offset < 0) {
         av_log(s->avctx, AV_LOG_ERROR, "motion offset < 0 (%d)\n", motion_offset);
         return AVERROR_INVALIDDATA;
@@ -931,12 +936,12 @@ static void ipvideo_format_06_secondpass(IpvideoContext *s, AVFrame *frame, int1
     int off_x, off_y;
 
     if (opcode < 0) {
-        off_x = ((uint16_t)opcode - 0xC000) % frame->linesize[0];
-        off_y = ((uint16_t)opcode - 0xC000) / frame->linesize[0];
+        off_x = ((uint16_t)opcode - 0xC000) % frame->width;
+        off_y = ((uint16_t)opcode - 0xC000) / frame->width;
         copy_from(s, s->last_frame, frame, off_x, off_y);
     } else if (opcode > 0) {
-        off_x = ((uint16_t)opcode - 0x4000) % frame->linesize[0];
-        off_y = ((uint16_t)opcode - 0x4000) / frame->linesize[0];
+        off_x = ((uint16_t)opcode - 0x4000) % frame->width;
+        off_y = ((uint16_t)opcode - 0x4000) / frame->width;
         copy_from(s, frame, frame, off_x, off_y);
     }
 }
@@ -1001,12 +1006,12 @@ static void ipvideo_format_10_secondpass(IpvideoContext *s, AVFrame *frame, int1
     int off_x, off_y;
 
     if (opcode < 0) {
-        off_x = ((uint16_t)opcode - 0xC000) % s->cur_decode_frame->linesize[0];
-        off_y = ((uint16_t)opcode - 0xC000) / s->cur_decode_frame->linesize[0];
+        off_x = ((uint16_t)opcode - 0xC000) % s->cur_decode_frame->width;
+        off_y = ((uint16_t)opcode - 0xC000) / s->cur_decode_frame->width;
         copy_from(s, s->prev_decode_frame, s->cur_decode_frame, off_x, off_y);
     } else if (opcode > 0) {
-        off_x = ((uint16_t)opcode - 0x4000) % s->cur_decode_frame->linesize[0];
-        off_y = ((uint16_t)opcode - 0x4000) / s->cur_decode_frame->linesize[0];
+        off_x = ((uint16_t)opcode - 0x4000) % s->cur_decode_frame->width;
+        off_y = ((uint16_t)opcode - 0x4000) / s->cur_decode_frame->width;
         copy_from(s, s->cur_decode_frame, s->cur_decode_frame, off_x, off_y);
     }
 }
@@ -1181,14 +1186,6 @@ static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
     s->cur_decode_frame->format  = avctx->pix_fmt;
     s->prev_decode_frame->format = avctx->pix_fmt;
 
-    ret = ff_get_buffer(avctx, s->cur_decode_frame, 0);
-    if (ret < 0)
-        goto error;
-
-    ret = ff_get_buffer(avctx, s->prev_decode_frame, 0);
-    if (ret < 0)
-        goto error;
-
     return 0;
 error:
     av_frame_free(&s->last_frame);
@@ -1239,83 +1236,83 @@ static int ipvideo_decode_frame(AVCodecContext *avctx,
     s->decoding_map_size = AV_RL16(buf + 4);
     s->skip_map_size     = AV_RL16(buf + 6);
 
-    switch(frame_format) {
-        case 0x06:
-            if (s->decoding_map_size) {
-                av_log(avctx, AV_LOG_ERROR, "Decoding map for format 0x06\n");
-                return AVERROR_INVALIDDATA;
-            }
+    switch (frame_format) {
+    case 0x06:
+        if (s->decoding_map_size) {
+            av_log(avctx, AV_LOG_ERROR, "Decoding map for format 0x06\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            if (s->skip_map_size) {
-                av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x06\n");
-                return AVERROR_INVALIDDATA;
-            }
+        if (s->skip_map_size) {
+            av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x06\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            if (s->is_16bpp) {
-                av_log(avctx, AV_LOG_ERROR, "Video format 0x06 does not support 16bpp movies\n");
-                return AVERROR_INVALIDDATA;
-            }
+        if (s->is_16bpp) {
+            av_log(avctx, AV_LOG_ERROR, "Video format 0x06 does not support 16bpp movies\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            /* Decoding map for 0x06 frame format is at the top of pixeldata */
-            s->decoding_map_size = ((s->avctx->width / 8) * (s->avctx->height / 8)) * 2;
-            s->decoding_map = buf + 8 + 14; /* 14 bits of op data */
-            video_data_size -= s->decoding_map_size + 14;
-            if (video_data_size <= 0)
-                return AVERROR_INVALIDDATA;
+        /* Decoding map for 0x06 frame format is at the top of pixeldata */
+        s->decoding_map_size = ((s->avctx->width / 8) * (s->avctx->height / 8)) * 2;
+        s->decoding_map = buf + 8 + 14; /* 14 bits of op data */
+        video_data_size -= s->decoding_map_size + 14;
+        if (video_data_size <= 0 || s->decoding_map_size == 0)
+            return AVERROR_INVALIDDATA;
 
-            if (buf_size < 8 + s->decoding_map_size + 14 + video_data_size)
-                return AVERROR_INVALIDDATA;
+        if (buf_size < 8 + s->decoding_map_size + 14 + video_data_size)
+            return AVERROR_INVALIDDATA;
 
-            bytestream2_init(&s->stream_ptr, buf + 8 + s->decoding_map_size + 14, video_data_size);
+        bytestream2_init(&s->stream_ptr, buf + 8 + s->decoding_map_size + 14, video_data_size);
 
-            break;
+        break;
 
-        case 0x10:
-            if (! s->decoding_map_size) {
-                av_log(avctx, AV_LOG_ERROR, "Empty decoding map for format 0x10\n");
-                return AVERROR_INVALIDDATA;
-            }
+    case 0x10:
+        if (! s->decoding_map_size) {
+            av_log(avctx, AV_LOG_ERROR, "Empty decoding map for format 0x10\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            if (! s->skip_map_size) {
-                av_log(avctx, AV_LOG_ERROR, "Empty skip map for format 0x10\n");
-                return AVERROR_INVALIDDATA;
-            }
+        if (! s->skip_map_size) {
+            av_log(avctx, AV_LOG_ERROR, "Empty skip map for format 0x10\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            if (s->is_16bpp) {
-                av_log(avctx, AV_LOG_ERROR, "Video format 0x10 does not support 16bpp movies\n");
-                return AVERROR_INVALIDDATA;
-            }
+        if (s->is_16bpp) {
+            av_log(avctx, AV_LOG_ERROR, "Video format 0x10 does not support 16bpp movies\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            if (buf_size < 8 + video_data_size + s->decoding_map_size + s->skip_map_size)
-                return AVERROR_INVALIDDATA;
+        if (buf_size < 8 + video_data_size + s->decoding_map_size + s->skip_map_size)
+            return AVERROR_INVALIDDATA;
 
-            bytestream2_init(&s->stream_ptr, buf + 8, video_data_size);
-            s->decoding_map = buf + 8 + video_data_size;
-            s->skip_map = buf + 8 + video_data_size + s->decoding_map_size;
+        bytestream2_init(&s->stream_ptr, buf + 8, video_data_size);
+        s->decoding_map = buf + 8 + video_data_size;
+        s->skip_map = buf + 8 + video_data_size + s->decoding_map_size;
 
-            break;
+        break;
 
-        case 0x11:
-            if (! s->decoding_map_size) {
-                av_log(avctx, AV_LOG_ERROR, "Empty decoding map for format 0x11\n");
-                return AVERROR_INVALIDDATA;
-            }
+    case 0x11:
+        if (! s->decoding_map_size) {
+            av_log(avctx, AV_LOG_ERROR, "Empty decoding map for format 0x11\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            if (s->skip_map_size) {
-                av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x11\n");
-                return AVERROR_INVALIDDATA;
-            }
+        if (s->skip_map_size) {
+            av_log(avctx, AV_LOG_ERROR, "Skip map for format 0x11\n");
+            return AVERROR_INVALIDDATA;
+        }
 
-            if (buf_size < 8 + video_data_size + s->decoding_map_size)
-                return AVERROR_INVALIDDATA;
+        if (buf_size < 8 + video_data_size + s->decoding_map_size)
+            return AVERROR_INVALIDDATA;
 
-            bytestream2_init(&s->stream_ptr, buf + 8, video_data_size);
-            s->decoding_map = buf + 8 + video_data_size;
+        bytestream2_init(&s->stream_ptr, buf + 8, video_data_size);
+        s->decoding_map = buf + 8 + video_data_size;
 
-            break;
+        break;
 
-        default:
-            av_log(avctx, AV_LOG_ERROR, "Frame type 0x%02X unsupported\n", frame_format);
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Frame type 0x%02X unsupported\n", frame_format);
     }
 
     /* ensure we can't overread the packet */
@@ -1338,16 +1335,16 @@ static int ipvideo_decode_frame(AVCodecContext *avctx,
         }
     }
 
-    switch(frame_format) {
-        case 0x06:
-            ipvideo_decode_format_06_opcodes(s, frame);
-            break;
-        case 0x10:
-            ipvideo_decode_format_10_opcodes(s, frame);
-            break;
-        case 0x11:
-            ipvideo_decode_format_11_opcodes(s, frame);
-            break;
+    switch (frame_format) {
+    case 0x06:
+        ipvideo_decode_format_06_opcodes(s, frame);
+        break;
+    case 0x10:
+        ipvideo_decode_format_10_opcodes(s, frame);
+        break;
+    case 0x11:
+        ipvideo_decode_format_11_opcodes(s, frame);
+        break;
     }
 
     *got_frame = send_buffer;