diff options
Diffstat (limited to 'plat_sdl.c')
| -rw-r--r-- | plat_sdl.c | 50 |
1 files changed, 45 insertions, 5 deletions
@@ -22,6 +22,9 @@ struct audio_state { struct audio_state audio; +static void plat_sound_select_resampler(void); +void (*plat_sound_write)(const struct audio_frame *data, int frames); + static char msg[HUD_LEN]; static unsigned msg_priority = 0; static unsigned msg_expire = 0; @@ -49,6 +52,13 @@ static void video_print_msg(uint16_t *dst, uint32_t h, uint32_t pitch, char *msg basic_text_out16_nf(dst, pitch, 2, h - 10, msg); } +static int audio_resample_passthrough(struct audio_frame data) { + audio.buf[audio.buf_w++] = data; + if (audio.buf_w >= audio.buf_len) audio.buf_w = 0; + + return 1; +} + static int audio_resample_nearest(struct audio_frame data) { static int diff = 0; int consumed = 0; @@ -295,7 +305,7 @@ static int plat_sound_init(void) SDL_AudioSpec spec, received; - spec.freq = SAMPLE_RATE; + spec.freq = MIN(sample_rate, MAX_SAMPLE_RATE); spec.format = AUDIO_S16; spec.channels = 2; spec.samples = 512; @@ -308,6 +318,7 @@ static int plat_sound_init(void) audio.in_sample_rate = sample_rate; audio.out_sample_rate = received.freq; + plat_sound_select_resampler(); plat_sound_resize_buffer(); SDL_PauseAudio(0); @@ -330,7 +341,7 @@ float plat_sound_capacity(void) } #define BATCH_SIZE 100 -void plat_sound_write(const struct audio_frame *data, int frames) +void plat_sound_write_resample(const struct audio_frame *data, int frames, int (*resample)(struct audio_frame data)) { int consumed = 0; if (audio.buf_len == 0) @@ -354,7 +365,7 @@ void plat_sound_write(const struct audio_frame *data, int frames) } while (amount && audio.buf_w != audio.max_buf_w) { - consumed = audio_resample_nearest(*data); + consumed = resample(*data); data += consumed; amount -= consumed; frames -= consumed; @@ -363,6 +374,16 @@ void plat_sound_write(const struct audio_frame *data, int frames) SDL_UnlockAudio(); } +void plat_sound_write_passthrough(const struct audio_frame *data, int frames) +{ + plat_sound_write_resample(data, frames, audio_resample_passthrough); +} + +void plat_sound_write_nearest(const struct audio_frame *data, int frames) +{ + plat_sound_write_resample(data, frames, audio_resample_nearest); +} + void plat_sound_resize_buffer(void) { size_t buf_size; SDL_LockAudio(); @@ -393,12 +414,25 @@ void plat_sound_resize_buffer(void) { SDL_UnlockAudio(); } +static void plat_sound_select_resampler(void) +{ + if (audio.in_sample_rate == audio.out_sample_rate) { + PA_INFO("Using passthrough resampler (in: %d, out: %d)\n", audio.in_sample_rate, audio.out_sample_rate); + plat_sound_write = plat_sound_write_passthrough; + } else { + PA_INFO("Using nearest resampler (in: %d, out: %d)\n", audio.in_sample_rate, audio.out_sample_rate); + plat_sound_write = plat_sound_write_nearest; + } +} + void plat_sdl_event_handler(void *event_) { } int plat_init(void) { + plat_sound_write = plat_sound_write_nearest; + SDL_Init(SDL_INIT_VIDEO); screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_BPP * 8, SDL_SWSURFACE); if (screen == NULL) { @@ -432,8 +466,14 @@ int plat_init(void) int plat_reinit(void) { - audio.in_sample_rate = sample_rate; - plat_sound_resize_buffer(); + if (sample_rate && sample_rate != audio.in_sample_rate) { + plat_sound_finish(); + + if (plat_sound_init()) { + PA_ERROR("SDL sound failed to init: %s\n", SDL_GetError()); + return -1; + } + } scale_update_scaler(); return 0; } |