From 759001c534287a96dc96d1e274665feb7059145d Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Wed, 21 Nov 2012 21:34:46 +0100
Subject: lavc decoders: work with refcounted frames.

---
 libavcodec/mdec.c | 46 +++++++++++++---------------------------------
 1 file changed, 13 insertions(+), 33 deletions(-)

(limited to 'libavcodec/mdec.c')

diff --git a/libavcodec/mdec.c b/libavcodec/mdec.c
index f85c3bac89..3a1a7074d4 100644
--- a/libavcodec/mdec.c
+++ b/libavcodec/mdec.c
@@ -35,7 +35,7 @@
 typedef struct MDECContext {
     AVCodecContext *avctx;
     DSPContext dsp;
-    AVFrame picture;
+    ThreadFrame frame;
     GetBitContext gb;
     ScanTable scantable;
     int version;
@@ -135,14 +135,14 @@ static inline int decode_mb(MDECContext *a, int16_t block[6][64])
     return 0;
 }
 
-static inline void idct_put(MDECContext *a, int mb_x, int mb_y)
+static inline void idct_put(MDECContext *a, AVFrame *frame, int mb_x, int mb_y)
 {
     int16_t (*block)[64] = a->block;
-    int linesize = a->picture.linesize[0];
+    int linesize = frame->linesize[0];
 
-    uint8_t *dest_y  = a->picture.data[0] + (mb_y * 16 * linesize              ) + mb_x * 16;
-    uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8  * a->picture.linesize[1]) + mb_x * 8;
-    uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8  * a->picture.linesize[2]) + mb_x * 8;
+    uint8_t *dest_y  = frame->data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
+    uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
+    uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
 
     a->dsp.idct_put(dest_y,                    linesize, block[0]);
     a->dsp.idct_put(dest_y                + 8, linesize, block[1]);
@@ -150,8 +150,8 @@ static inline void idct_put(MDECContext *a, int mb_x, int mb_y)
     a->dsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
 
     if (!(a->avctx->flags & CODEC_FLAG_GRAY)) {
-        a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
-        a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
+        a->dsp.idct_put(dest_cb, frame->linesize[1], block[4]);
+        a->dsp.idct_put(dest_cr, frame->linesize[2], block[5]);
     }
 }
 
@@ -162,20 +162,15 @@ static int decode_frame(AVCodecContext *avctx,
     MDECContext * const a = avctx->priv_data;
     const uint8_t *buf    = avpkt->data;
     int buf_size          = avpkt->size;
-    AVFrame *picture      = data;
-    AVFrame * const p     = &a->picture;
+    ThreadFrame frame     = { .f = data };
     int i, ret;
 
-    if (p->data[0])
-        ff_thread_release_buffer(avctx, p);
-
-    p->reference = 0;
-    if ((ret = ff_thread_get_buffer(avctx, p)) < 0) {
+    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return ret;
     }
-    p->pict_type = AV_PICTURE_TYPE_I;
-    p->key_frame = 1;
+    frame.f->pict_type = AV_PICTURE_TYPE_I;
+    frame.f->key_frame = 1;
 
     av_fast_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
     if (!a->bitstream_buffer)
@@ -199,14 +194,10 @@ static int decode_frame(AVCodecContext *avctx,
             if ((ret = decode_mb(a, a->block)) < 0)
                 return ret;
 
-            idct_put(a, a->mb_x, a->mb_y);
+            idct_put(a, frame.f, a->mb_x, a->mb_y);
         }
     }
 
-    p->quality = a->qscale * FF_QP2LAMBDA;
-    memset(p->qscale_table, a->qscale, a->mb_width);
-
-    *picture   = a->picture;
     *got_frame = 1;
 
     return (get_bits_count(&a->gb) + 31) / 32 * 4;
@@ -215,12 +206,10 @@ static int decode_frame(AVCodecContext *avctx,
 static av_cold int decode_init(AVCodecContext *avctx)
 {
     MDECContext * const a = avctx->priv_data;
-    AVFrame *p            = &a->picture;
 
     a->mb_width  = (avctx->coded_width  + 15) / 16;
     a->mb_height = (avctx->coded_height + 15) / 16;
 
-    avctx->coded_frame = &a->picture;
     a->avctx           = avctx;
 
     ff_dsputil_init(&a->dsp, avctx);
@@ -229,8 +218,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
 
     if (avctx->idct_algo == FF_IDCT_AUTO)
         avctx->idct_algo = FF_IDCT_SIMPLE;
-    p->qstride      = 0;
-    p->qscale_table = av_mallocz(a->mb_width);
     avctx->pix_fmt  = AV_PIX_FMT_YUVJ420P;
 
     return 0;
@@ -239,13 +226,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
 static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
 {
     MDECContext * const a = avctx->priv_data;
-    AVFrame *p            = &a->picture;
 
-    avctx->coded_frame = p;
     a->avctx           = avctx;
 
-    p->qscale_table = av_mallocz( a->mb_width);
-
     return 0;
 }
 
@@ -253,10 +236,7 @@ static av_cold int decode_end(AVCodecContext *avctx)
 {
     MDECContext * const a = avctx->priv_data;
 
-    if (a->picture.data[0])
-        avctx->release_buffer(avctx, &a->picture);
     av_freep(&a->bitstream_buffer);
-    av_freep(&a->picture.qscale_table);
     a->bitstream_buffer_size = 0;
 
     return 0;
-- 
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