From 22b37f5d3200cfe4c15eded883663cf0612093c1 Mon Sep 17 00:00:00 2001
From: Fabrice Bellard <fabrice@bellard.org>
Date: Sun, 24 Aug 2003 21:20:44 +0000
Subject: suppressed frame number modulus hack - added loop_input hack which I
 find easier to understand

Originally committed as revision 2151 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/img.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

(limited to 'libavformat/img.c')

diff --git a/libavformat/img.c b/libavformat/img.c
index c431e23e2f..d8b0f3b583 100644
--- a/libavformat/img.c
+++ b/libavformat/img.c
@@ -20,10 +20,16 @@
 #include "avformat.h"
 #include "os_support.h"
 
+/* XXX: this is a hack */
+int loop_input = 0;
+
 typedef struct {
     int width;
     int height;
+    int img_first;
+    int img_last;
     int img_number;
+    int img_count;
     int img_size;
     AVImageFormat *img_fmt;
     int pix_fmt;
@@ -121,7 +127,8 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
 
     strcpy(s->path, s1->filename);
     s->img_number = 0;
-
+    s->img_count = 0;
+    
     /* find format */
     if (s1->iformat->flags & AVFMT_NOFILE)
         s->is_pipe = 0;
@@ -139,6 +146,8 @@ static int img_read_header(AVFormatContext *s1, AVFormatParameters *ap)
     if (!s->is_pipe) {
         if (find_image_range(&first_index, &last_index, s->path) < 0)
             goto fail;
+        s->img_first = first_index;
+        s->img_last = last_index;
         s->img_number = first_index;
         /* compute duration */
         st->start_time = 0;
@@ -198,6 +207,10 @@ static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
     ByteIOContext f1, *f;
 
     if (!s->is_pipe) {
+        /* loop over input */
+        if (loop_input && s->img_number > s->img_last) {
+            s->img_number = s->img_first;
+        }
         if (get_frame_filename(filename, sizeof(filename),
                                s->path, s->img_number) < 0)
             return -EIO;
@@ -223,7 +236,10 @@ static int img_read_packet(AVFormatContext *s1, AVPacket *pkt)
         av_free_packet(pkt);
         return -EIO; /* signal EOF */
     } else {
-        pkt->pts = av_rescale((int64_t)s->img_number * s1->streams[0]->codec.frame_rate_base, s1->pts_den, s1->streams[0]->codec.frame_rate) / s1->pts_num;
+        /* XXX: computing this pts is not necessary as it is done in
+           the generic code too */
+        pkt->pts = av_rescale((int64_t)s->img_count * s1->streams[0]->codec.frame_rate_base, s1->pts_den, s1->streams[0]->codec.frame_rate) / s1->pts_num;
+        s->img_count++;
         s->img_number++;
         return 0;
     }
-- 
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