ffplay: use SDL2 audio API

It allows us to specify what kind of audio parameter changes are allowed.

Should fix ticket #6721.
Signed-off-by: Marton Balint <cus@passwd.hu>

fftools/ffplay.c

@@ -362,6 +362,7 @@ static AVPacket flush_pkt;
 static SDL_Window *window;
 static SDL_Renderer *renderer;
 static SDL_RendererInfo renderer_info = {0};
+static SDL_AudioDeviceID audio_dev;
 
 static const struct TextureFormatEntry {
     enum AVPixelFormat format;
@@ -1192,7 +1193,7 @@ static void stream_component_close(VideoState *is, int stream_index)
     switch (codecpar->codec_type) {
     case AVMEDIA_TYPE_AUDIO:
         decoder_abort(&is->auddec, &is->sampq);
-        SDL_CloseAudio();
+        SDL_CloseAudioDevice(audio_dev);
         decoder_destroy(&is->auddec);
         swr_free(&is->swr_ctx);
         av_freep(&is->audio_buf1);
@@ -2451,7 +2452,7 @@ static void sdl_audio_callback(void *opaque, Uint8 *stream, int len)
         else {
             memset(stream, 0, len1);
             if (!is->muted && is->audio_buf)
-                SDL_MixAudio(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, len1, is->audio_volume);
+                SDL_MixAudioFormat(stream, (uint8_t *)is->audio_buf + is->audio_buf_index, AUDIO_S16SYS, len1, is->audio_volume);
         }
         len -= len1;
         stream += len1;
@@ -2496,7 +2497,7 @@ static int audio_open(void *opaque, int64_t wanted_channel_layout, int wanted_nb
     wanted_spec.samples = FFMAX(SDL_AUDIO_MIN_BUFFER_SIZE, 2 << av_log2(wanted_spec.freq / SDL_AUDIO_MAX_CALLBACKS_PER_SEC));
     wanted_spec.callback = sdl_audio_callback;
     wanted_spec.userdata = opaque;
-    while (SDL_OpenAudio(&wanted_spec, &spec) < 0) {
+    while (!(audio_dev = SDL_OpenAudioDevice(NULL, 0, &wanted_spec, &spec, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE | SDL_AUDIO_ALLOW_CHANNELS_CHANGE))) {
         av_log(NULL, AV_LOG_WARNING, "SDL_OpenAudio (%d channels, %d Hz): %s\n",
                wanted_spec.channels, wanted_spec.freq, SDL_GetError());
         wanted_spec.channels = next_nb_channels[FFMIN(7, wanted_spec.channels)];
@@ -2659,7 +2660,7 @@ static int stream_component_open(VideoState *is, int stream_index)
         }
         if ((ret = decoder_start(&is->auddec, audio_thread, is)) < 0)
             goto out;
-        SDL_PauseAudio(0);
+        SDL_PauseAudioDevice(audio_dev, 0);
         break;
     case AVMEDIA_TYPE_VIDEO:
         is->video_stream = stream_index;