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ffplay: calculate SDL audio buffer size based on sample rate

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Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2014-05-25 02:41:09 +02:00
parent ba800defa7
commit 1ca5c1784b
1 changed files with 6 additions and 4 deletions
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10
ffplay.c
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@ -67,9 +67,11 @@ const int program_birth_year = 2003;
#define MAX_QUEUE_SIZE (15 * 1024 * 1024)
#define MIN_FRAMES 5
/* SDL audio buffer size, in samples. Should be small to have precise
/* Minimum SDL audio buffer size, in samples. Should be small to have precise
A/V sync as SDL does not have hardware buffer fullness info. */
#define SDL_AUDIO_BUFFER_SIZE 1024
#define SDL_AUDIO_MIN_BUFFER_SIZE 512
/* Calculate actual buffer size keeping in mind not cause too frequent audio callbacks */
#define SDL_AUDIO_MAX_CALLBACKS_PER_SEC 60
/* no AV sync correction is done if below the minimum AV sync threshold */
#define AV_SYNC_THRESHOLD_MIN 0.04
@ -202,7 +204,7 @@ typedef struct VideoState {
AVStream *audio_st;
PacketQueue audioq;
int audio_hw_buf_size;
uint8_t silence_buf[SDL_AUDIO_BUFFER_SIZE];
uint8_t silence_buf[SDL_AUDIO_MIN_BUFFER_SIZE];
uint8_t *audio_buf;
uint8_t *audio_buf1;
unsigned int audio_buf_size; /* in bytes */
@ -2483,7 +2485,7 @@ static int audio_open(void *opaque, int64_t wanted_channel_layout, int wanted_nb
next_sample_rate_idx--;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.silence = 0;
wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE;
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) {