From c8dcff0cdb17d0aa03ac729eba12d1a20f1f59c8 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Mon, 21 Mar 2016 16:14:31 +0100
Subject: h264: factor out calculating the POC count into a separate file

This will allow decoupling the parser from the decoder.
---
 libavcodec/h264.c | 93 +++++--------------------------------------------------
 1 file changed, 7 insertions(+), 86 deletions(-)

(limited to 'libavcodec/h264.c')

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 81c1e81832..e415103a0f 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -399,7 +399,7 @@ static int h264_init_context(AVCodecContext *avctx, H264Context *h)
     h->slice_context_count   = 1;
     h->workaround_bugs       = avctx->workaround_bugs;
     h->flags                 = avctx->flags;
-    h->prev_poc_msb          = 1 << 16;
+    h->poc.prev_poc_msb      = 1 << 16;
     h->x264_build            = -1;
     h->recovery_frame        = -1;
     h->frame_recovered       = 0;
@@ -813,10 +813,10 @@ static void decode_postinit(H264Context *h, int setup_finished)
 static void idr(H264Context *h)
 {
     ff_h264_remove_all_refs(h);
-    h->prev_frame_num        =
-    h->prev_frame_num_offset =
-    h->prev_poc_msb          =
-    h->prev_poc_lsb          = 0;
+    h->poc.prev_frame_num        =
+    h->poc.prev_frame_num_offset =
+    h->poc.prev_poc_msb          =
+    h->poc.prev_poc_lsb          = 0;
 }
 
 /* forget old pics after a seek */
@@ -857,85 +857,6 @@ static void flush_dpb(AVCodecContext *avctx)
     h->context_initialized = 0;
 }
 
-int ff_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc)
-{
-    const SPS *sps = h->ps.sps;
-    const int max_frame_num = 1 << sps->log2_max_frame_num;
-    int field_poc[2];
-
-    h->frame_num_offset = h->prev_frame_num_offset;
-    if (h->frame_num < h->prev_frame_num)
-        h->frame_num_offset += max_frame_num;
-
-    if (sps->poc_type == 0) {
-        const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
-
-        if (h->poc_lsb < h->prev_poc_lsb &&
-            h->prev_poc_lsb - h->poc_lsb >= max_poc_lsb / 2)
-            h->poc_msb = h->prev_poc_msb + max_poc_lsb;
-        else if (h->poc_lsb > h->prev_poc_lsb &&
-                 h->prev_poc_lsb - h->poc_lsb < -max_poc_lsb / 2)
-            h->poc_msb = h->prev_poc_msb - max_poc_lsb;
-        else
-            h->poc_msb = h->prev_poc_msb;
-        field_poc[0] =
-        field_poc[1] = h->poc_msb + h->poc_lsb;
-        if (h->picture_structure == PICT_FRAME)
-            field_poc[1] += h->delta_poc_bottom;
-    } else if (sps->poc_type == 1) {
-        int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc;
-        int i;
-
-        if (sps->poc_cycle_length != 0)
-            abs_frame_num = h->frame_num_offset + h->frame_num;
-        else
-            abs_frame_num = 0;
-
-        if (h->nal_ref_idc == 0 && abs_frame_num > 0)
-            abs_frame_num--;
-
-        expected_delta_per_poc_cycle = 0;
-        for (i = 0; i < sps->poc_cycle_length; i++)
-            // FIXME integrate during sps parse
-            expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
-
-        if (abs_frame_num > 0) {
-            int poc_cycle_cnt          = (abs_frame_num - 1) / sps->poc_cycle_length;
-            int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
-
-            expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
-            for (i = 0; i <= frame_num_in_poc_cycle; i++)
-                expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
-        } else
-            expectedpoc = 0;
-
-        if (h->nal_ref_idc == 0)
-            expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
-
-        field_poc[0] = expectedpoc + h->delta_poc[0];
-        field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
-
-        if (h->picture_structure == PICT_FRAME)
-            field_poc[1] += h->delta_poc[1];
-    } else {
-        int poc = 2 * (h->frame_num_offset + h->frame_num);
-
-        if (!h->nal_ref_idc)
-            poc--;
-
-        field_poc[0] = poc;
-        field_poc[1] = poc;
-    }
-
-    if (h->picture_structure != PICT_BOTTOM_FIELD)
-        pic_field_poc[0] = field_poc[0];
-    if (h->picture_structure != PICT_TOP_FIELD)
-        pic_field_poc[1] = field_poc[1];
-    *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
-
-    return 0;
-}
-
 /**
  * Compute profile from profile_idc and constraint_set?_flags.
  *
@@ -1064,14 +985,14 @@ again:
                 break;
 
             if (h->sei_recovery_frame_cnt >= 0 && h->recovery_frame < 0) {
-                h->recovery_frame = (h->frame_num + h->sei_recovery_frame_cnt) &
+                h->recovery_frame = (h->poc.frame_num + h->sei_recovery_frame_cnt) &
                                     ((1 << h->ps.sps->log2_max_frame_num) - 1);
             }
 
             h->cur_pic_ptr->f->key_frame |=
                 (nal->type == NAL_IDR_SLICE) || (h->sei_recovery_frame_cnt >= 0);
 
-            if (nal->type == NAL_IDR_SLICE || h->recovery_frame == h->frame_num) {
+            if (nal->type == NAL_IDR_SLICE || h->recovery_frame == h->poc.frame_num) {
                 h->recovery_frame         = -1;
                 h->cur_pic_ptr->recovered = 1;
             }
-- 
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