swr: rename swr_alloc2() to swr_alloc_set_opts().

ffmpeg.c

@@ -891,7 +891,7 @@ need_realloc:
             //ost->swr = NULL;
             ost->audio_resample = 0;
         } else {
-            ost->swr = swr_alloc2(ost->swr,
+            ost->swr = swr_alloc_set_opts(ost->swr,
                                           enc->channel_layout, enc->sample_fmt, enc->sample_rate,
                                           dec->channel_layout, dec->sample_fmt, dec->sample_rate,
                                           ost->audio_channels_mapped ? ost->audio_channels_map : NULL,

ffplay.c

@@ -2076,7 +2076,8 @@ static int audio_decode_frame(VideoState *is, double *pts_ptr)
             if (dec->sample_fmt != is->audio_src_fmt || dec_channel_layout != is->audio_src_channel_layout || dec->sample_rate != is->audio_src_freq) {
                 if (is->swr_ctx)
                     swr_free(&is->swr_ctx);
-                is->swr_ctx = swr_alloc2(NULL, is->audio_tgt_channel_layout, is->audio_tgt_fmt, is->audio_tgt_freq,
+                is->swr_ctx = swr_alloc_set_opts(NULL,
+                                                 is->audio_tgt_channel_layout, is->audio_tgt_fmt, is->audio_tgt_freq,
                                                  dec_channel_layout,           dec->sample_fmt,   dec->sample_rate,
                                                  NULL, 0, NULL);
                 if (!is->swr_ctx || swr_init(is->swr_ctx) < 0) {

libswresample/swresample.c

@@ -82,7 +82,8 @@ SwrContext *swr_alloc(void){
     return s;
 }
 
-SwrContext *swr_alloc2(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
+SwrContext *swr_alloc_set_opts(struct SwrContext *s,
+                               int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
                                int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
                                const int *channel_map, int log_offset, void *log_ctx){
     if(!s) s= swr_alloc();

libswresample/swresample.h

@@ -55,7 +55,8 @@ int swr_init(struct SwrContext *s);
  * @see swr_init(),swr_free()
  * @return NULL on error
  */
-struct SwrContext *swr_alloc2(struct SwrContext *s, int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
+struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
+                                      int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
                                       int64_t  in_ch_layout, enum AVSampleFormat  in_sample_fmt, int  in_sample_rate,
                                       const int *channel_map, int log_offset, void *log_ctx);
 

libswresample/swresample_test.c

@@ -130,10 +130,10 @@ int main(int argc, char **argv){
                                in_ch_count, out_ch_count,
                                in_sample_rate, out_sample_rate,
                                av_get_sample_fmt_name(in_sample_fmt), av_get_sample_fmt_name(out_sample_fmt));
-                        forw_ctx  = swr_alloc2(forw_ctx, out_ch_layout, out_sample_fmt+planar_out, out_sample_rate,
+                        forw_ctx  = swr_alloc_set_opts(forw_ctx, out_ch_layout, out_sample_fmt+planar_out, out_sample_rate,
                                                                   in_ch_layout,  in_sample_fmt+planar_in ,  in_sample_rate,
                                                        NULL, 0, 0);
-                        backw_ctx = swr_alloc2(backw_ctx,in_ch_layout,  in_sample_fmt,             in_sample_rate,
+                        backw_ctx = swr_alloc_set_opts(backw_ctx, in_ch_layout,  in_sample_fmt,             in_sample_rate,
                                                                  out_ch_layout, out_sample_fmt+planar_out, out_sample_rate,
                                                        NULL, 0, 0);
                         if(swr_init( forw_ctx) < 0)