From a75529e81ea14c6d7c449e205aef97a0acb2645f Mon Sep 17 00:00:00 2001
From: Alexander Strange <astrange@ithinksw.com>
Date: Mon, 28 Mar 2011 21:44:38 -0700
Subject: mimic: implement multithreading.

---
 libavcodec/mimic.c | 60 ++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 49 insertions(+), 11 deletions(-)

(limited to 'libavcodec')

diff --git a/libavcodec/mimic.c b/libavcodec/mimic.c
index a12f638..133d26f 100644
--- a/libavcodec/mimic.c
+++ b/libavcodec/mimic.c
@@ -27,6 +27,7 @@
 #include "get_bits.h"
 #include "bytestream.h"
 #include "dsputil.h"
+#include "thread.h"
 
 #define MIMIC_HEADER_SIZE   20
 
@@ -51,6 +52,10 @@ typedef struct {
     ScanTable       scantable;
     DSPContext      dsp;
     VLC             vlc;
+
+    /* Kept in the context so multithreading can have a constant to read from */
+    int             next_cur_index;
+    int             next_prev_index;
 } MimicContext;
 
 static const uint32_t huffcodes[] = {
@@ -121,6 +126,23 @@ static av_cold int mimic_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
+static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from)
+{
+    MimicContext *dst = avctx->priv_data, *src = avctx_from->priv_data;
+
+    if (avctx == avctx_from) return 0;
+
+    dst->cur_index  = src->next_cur_index;
+    dst->prev_index = src->next_prev_index;
+
+    memcpy(dst->buf_ptrs, src->buf_ptrs, sizeof(src->buf_ptrs));
+    memcpy(dst->flipped_ptrs, src->flipped_ptrs, sizeof(src->flipped_ptrs));
+
+    memset(&dst->buf_ptrs[dst->cur_index], 0, sizeof(AVFrame));
+
+    return 0;
+}
+
 static const int8_t vlcdec_lookup[9][64] = {
     {    0, },
     {   -1,   1, },
@@ -205,7 +227,7 @@ static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
 static int decode(MimicContext *ctx, int quality, int num_coeffs,
                   int is_iframe)
 {
-    int y, x, plane;
+    int y, x, plane, cur_row = 0;
 
     for(plane = 0; plane < 3; plane++) {
         const int is_chroma = !!plane;
@@ -236,6 +258,7 @@ static int decode(MimicContext *ctx, int quality, int num_coeffs,
                         int index = (ctx->cur_index+backref)&15;
                         uint8_t *p = ctx->flipped_ptrs[index].data[0];
 
+                        ff_thread_await_progress(&ctx->buf_ptrs[index], cur_row, 0);
                         if(p) {
                             p += src -
                                 ctx->flipped_ptrs[ctx->prev_index].data[plane];
@@ -246,6 +269,7 @@ static int decode(MimicContext *ctx, int quality, int num_coeffs,
                         }
                     }
                 } else {
+                    ff_thread_await_progress(&ctx->buf_ptrs[ctx->prev_index], cur_row, 0);
                     ctx->dsp.put_pixels_tab[1][0](dst, src, stride, 8);
                 }
                 src += 8;
@@ -253,6 +277,8 @@ static int decode(MimicContext *ctx, int quality, int num_coeffs,
             }
             src += (stride - ctx->num_hblocks[plane])<<3;
             dst += (stride - ctx->num_hblocks[plane])<<3;
+
+            ff_thread_report_progress(&ctx->buf_ptrs[ctx->cur_index], cur_row++, 0);
         }
     }
 
@@ -326,14 +352,20 @@ static int mimic_decode_frame(AVCodecContext *avctx, void *data,
     }
 
     ctx->buf_ptrs[ctx->cur_index].reference = 1;
-    if(avctx->get_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index])) {
+    ctx->buf_ptrs[ctx->cur_index].pict_type = is_pframe ? FF_P_TYPE:FF_I_TYPE;
+    if(ff_thread_get_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index])) {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
 
+    ctx->next_prev_index = ctx->cur_index;
+    ctx->next_cur_index  = (ctx->cur_index - 1) & 15;
+
     prepare_avpic(ctx, &ctx->flipped_ptrs[ctx->cur_index],
                   (AVPicture*) &ctx->buf_ptrs[ctx->cur_index]);
 
+    ff_thread_finish_setup(avctx);
+
     av_fast_malloc(&ctx->swap_buf, &ctx->swap_buf_size,
                                  swap_buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
     if(!ctx->swap_buf)
@@ -345,21 +377,23 @@ static int mimic_decode_frame(AVCodecContext *avctx, void *data,
     init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3);
 
     if(!decode(ctx, quality, num_coeffs, !is_pframe)) {
-        avctx->release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]);
-        return -1;
+        if (avctx->active_thread_type&FF_THREAD_FRAME)
+            ff_thread_report_progress(&ctx->buf_ptrs[ctx->cur_index], INT_MAX, 0);
+        else {
+            ff_thread_release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]);
+            return -1;
+        }
     }
 
-    ctx->buf_ptrs[ctx->cur_index].pict_type = is_pframe ? FF_P_TYPE:FF_I_TYPE;
     *(AVFrame*)data = ctx->buf_ptrs[ctx->cur_index];
     *data_size = sizeof(AVFrame);
 
-    ctx->prev_index = ctx->cur_index;
-    ctx->cur_index--;
-    ctx->cur_index &= 15;
+    ctx->prev_index = ctx->next_prev_index;
+    ctx->cur_index  = ctx->next_cur_index;
 
     /* Only release frames that aren't used for backreferences anymore */
     if(ctx->buf_ptrs[ctx->cur_index].data[0])
-        avctx->release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]);
+        ff_thread_release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]);
 
     return buf_size;
 }
@@ -370,9 +404,12 @@ static av_cold int mimic_decode_end(AVCodecContext *avctx)
     int i;
 
     av_free(ctx->swap_buf);
+
+    if(avctx->is_copy) return 0;
+
     for(i = 0; i < 16; i++)
         if(ctx->buf_ptrs[i].data[0])
-            avctx->release_buffer(avctx, &ctx->buf_ptrs[i]);
+            ff_thread_release_buffer(avctx, &ctx->buf_ptrs[i]);
     free_vlc(&ctx->vlc);
 
     return 0;
@@ -387,6 +424,7 @@ AVCodec ff_mimic_decoder = {
     NULL,
     mimic_decode_end,
     mimic_decode_frame,
-    CODEC_CAP_DR1,
+    CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
     .long_name = NULL_IF_CONFIG_SMALL("Mimic"),
+    .update_thread_context = ONLY_IF_THREADS_ENABLED(mimic_decode_update_thread_context)
 };
-- 
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