avcodec/mpeg12dec: forward error codes

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mpeg12dec.c

@@ -733,6 +733,7 @@ static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 {
     int i, j, k, cbp, val, mb_type, motion_type;
     const int mb_block_count = 4 + (1 << s->chroma_format);
+    int ret;
 
     av_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
 
@@ -846,13 +847,13 @@ static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
                     mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
             } else {
                 for (i = 0; i < mb_block_count; i++)
-                    if (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
-                        return -1;
+                    if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
+                        return ret;
             }
         } else {
             for (i = 0; i < 6; i++)
-                if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
-                    return -1;
+                if ((ret = mpeg1_decode_block_intra(s, *s->pblocks[i], i)) < 0)
+                    return ret;
         }
     } else {
         if (mb_type & MB_TYPE_ZERO_MV) {
@@ -1074,8 +1075,8 @@ static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
 
                     for (i = 0; i < mb_block_count; i++) {
                         if (cbp & (1 << 11)) {
-                            if (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
-                                return -1;
+                            if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
+                                return ret;
                         } else {
                             s->block_last_index[i] = -1;
                         }
@@ -1094,8 +1095,8 @@ static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
                 } else {
                     for (i = 0; i < 6; i++) {
                         if (cbp & 32) {
-                            if (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
-                                return -1;
+                            if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
+                                return ret;
                         } else {
                             s->block_last_index[i] = -1;
                         }
@@ -1627,13 +1628,14 @@ static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
 {
     AVCodecContext *avctx = s->avctx;
     Mpeg1Context *s1      = (Mpeg1Context *) s;
+    int ret;
 
     /* start frame decoding */
     if (s->first_field || s->picture_structure == PICT_FRAME) {
         AVFrameSideData *pan_scan;
 
-        if (ff_mpv_frame_start(s, avctx) < 0)
-            return -1;
+        if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
+            return ret;
 
         ff_mpeg_er_frame_start(s);
 
@@ -1712,8 +1714,8 @@ static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
     }
 
     if (avctx->hwaccel) {
-        if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
-            return -1;
+        if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
+            return ret;
     }
 
     return 0;
@@ -1734,6 +1736,7 @@ static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
     AVCodecContext *avctx = s->avctx;
     const int lowres      = s->avctx->lowres;
     const int field_pic   = s->picture_structure != PICT_FRAME;
+    int ret;
 
     s->resync_mb_x =
     s->resync_mb_y = -1;
@@ -1830,8 +1833,8 @@ static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
         if ((CONFIG_MPEG1_XVMC_HWACCEL || CONFIG_MPEG2_XVMC_HWACCEL) && s->pack_pblocks)
             ff_xvmc_init_block(s); // set s->block
 
-        if (mpeg_decode_mb(s, s->block) < 0)
-            return -1;
+        if ((ret = mpeg_decode_mb(s, s->block)) < 0)
+            return ret;
 
         // Note motion_val is normally NULL unless we want to extract the MVs.
         if (s->current_picture.motion_val[0] && !s->encoding) {
@@ -2189,6 +2192,7 @@ static int vcr2_init_sequence(AVCodecContext *avctx)
     Mpeg1Context *s1  = avctx->priv_data;
     MpegEncContext *s = &s1->mpeg_enc_ctx;
     int i, v;
+    int ret;
 
     /* start new MPEG-1 context decoding */
     s->out_format = FMT_MPEG1;
@@ -2205,8 +2209,8 @@ static int vcr2_init_sequence(AVCodecContext *avctx)
     setup_hwaccel_for_pixfmt(avctx);
 
     ff_mpv_idct_init(s);
-    if (ff_mpv_common_init(s) < 0)
-        return -1;
+    if ((ret = ff_mpv_common_init(s)) < 0)
+        return ret;
     s1->mpeg_enc_ctx_allocated = 1;
 
     for (i = 0; i < 64; i++) {
@@ -2663,8 +2667,8 @@ static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
                 if (s->first_slice) {
                     skip_frame     = 0;
                     s->first_slice = 0;
-                    if (mpeg_field_start(s2, buf, buf_size) < 0)
-                        return -1;
+                    if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
+                        return ret;
                 }
                 if (!s2->current_picture_ptr) {
                     av_log(avctx, AV_LOG_ERROR,