fftools/ffmpeg, ffmpeg_opt: Allocate (In|Out)putStream.pkt early

Avoids checks lateron in the hot path.

Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

fftools/ffmpeg.c

@@ -1533,9 +1533,6 @@ static int reap_filters(int flush)
         if (av_buffersink_get_type(filter) == AVMEDIA_TYPE_AUDIO)
             init_output_stream_wrapper(ost, NULL, 1);
 
-        if (!ost->pkt && !(ost->pkt = av_packet_alloc())) {
-            return AVERROR(ENOMEM);
-        }
         if (!ost->filtered_frame && !(ost->filtered_frame = av_frame_alloc())) {
             return AVERROR(ENOMEM);
         }
@@ -1979,9 +1976,6 @@ static void flush_encoders(void)
             AVPacket *pkt = ost->pkt;
             int pkt_size;
 
-            if (!pkt)
-                break;
-
             switch (enc->codec_type) {
             case AVMEDIA_TYPE_AUDIO:
                 desc   = "audio";
@@ -2597,8 +2591,6 @@ static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output,
     for (i = 0; i < nb_output_streams; i++) {
         OutputStream *ost = output_streams[i];
 
-        if (!ost->pkt && !(ost->pkt = av_packet_alloc()))
-            exit_program(1);
         if (!check_output_constraints(ist, ost) || !ost->encoding_needed
             || ost->enc->type != AVMEDIA_TYPE_SUBTITLE)
             continue;
@@ -2634,11 +2626,7 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt, int no_eo
     int repeating = 0;
     int eof_reached = 0;
 
-    AVPacket *avpkt;
-
-    if (!ist->pkt && !(ist->pkt = av_packet_alloc()))
-        return AVERROR(ENOMEM);
-    avpkt = ist->pkt;
+    AVPacket *avpkt = ist->pkt;
 
     if (!ist->saw_first_ts) {
         ist->first_dts =
@@ -2809,8 +2797,6 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt, int no_eo
     for (i = 0; i < nb_output_streams; i++) {
         OutputStream *ost = output_streams[i];
 
-        if (!ost->pkt && !(ost->pkt = av_packet_alloc()))
-            exit_program(1);
         if (!check_output_constraints(ist, ost) || ost->encoding_needed)
             continue;
 

fftools/ffmpeg_opt.c

@@ -888,6 +888,10 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
             exit_program(1);
         }
 
+        ist->pkt = av_packet_alloc();
+        if (!ist->pkt)
+            exit_program(1);
+
         if (o->bitexact)
             ist->dec_ctx->flags |= AV_CODEC_FLAG_BITEXACT;
 
@@ -1516,6 +1520,10 @@ static OutputStream *new_output_stream(OptionsContext *o, AVFormatContext *oc, e
         exit_program(1);
     }
 
+    ost->pkt = av_packet_alloc();
+    if (!ost->pkt)
+        exit_program(1);
+
     if (ost->enc) {
         AVIOContext *s = NULL;
         char *buf = NULL, *arg = NULL, *preset = NULL;