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Automatically resample if needed.

This commit is contained in:
Themaister 2012-11-28 16:00:49 +01:00
parent 64d3d2185c
commit b951f4ab0c
1 changed files with 39 additions and 2 deletions
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41
record/ffemu.c
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@ -174,7 +174,7 @@ static bool ffemu_codec_has_sample_format(enum AVSampleFormat fmt, const enum AV
return false;
}
static void ffemu_audio_resolve_format(struct ff_audio_info *audio, AVCodec *codec)
static void ffemu_audio_resolve_format(struct ff_audio_info *audio, const AVCodec *codec)
{
audio->codec->sample_fmt = AV_SAMPLE_FMT_NONE;
audio->fill_format = AV_SAMPLE_FMT_NONE;
@ -211,6 +211,42 @@ static void ffemu_audio_resolve_format(struct ff_audio_info *audio, AVCodec *cod
audio->sample_size = audio->use_float ? sizeof(float) : sizeof(int16_t);
}
static void ffemu_audio_resolve_sample_rate(ffemu_t *handle, const AVCodec *codec)
{
struct ff_config_param *params = &handle->config;
struct ffemu_params *param = &handle->params;
// We'll have to force resampling to some supported sampling rate.
if (codec->supported_samplerates && !params->sample_rate)
{
int input_rate = (int)param->samplerate;
// Favor closest sampling rate, but always prefer ratio > 1.0.
int best_rate = codec->supported_samplerates[0];
int best_diff = best_rate - input_rate;
for (unsigned i = 1; codec->supported_samplerates[i]; i++)
{
int diff = codec->supported_samplerates[i] - input_rate;
bool better_rate;
if (best_diff < 0)
better_rate = diff > best_diff;
else
better_rate = diff >= 0 && diff < best_diff;
if (better_rate)
{
best_rate = codec->supported_samplerates[i];
best_diff = diff;
}
}
params->sample_rate = best_rate;
RARCH_LOG("[FFmpeg]: Using output sampling rate: %u.\n", best_rate);
}
}
static bool ffemu_init_audio(ffemu_t *handle)
{
struct ff_config_param *params = &handle->config;
@ -230,9 +266,10 @@ static bool ffemu_init_audio(ffemu_t *handle)
audio->codec->codec_type = AVMEDIA_TYPE_AUDIO;
audio->codec->channels = param->channels;
audio->codec->channel_layout = AV_CH_LAYOUT_STEREO;
audio->codec->channel_layout = param->channels > 1 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
ffemu_audio_resolve_format(audio, codec);
ffemu_audio_resolve_sample_rate(handle, codec);
if (params->sample_rate)
{