diff --git a/libavcodec/resample.c b/libavcodec/resample.c index 8c4eebe3c4..82c09fc502 100644 --- a/libavcodec/resample.c +++ b/libavcodec/resample.c @@ -180,6 +180,21 @@ static void ac3_5p1_mux(short *output, short *input1, short *input2, int n) } } +#define SUPPORT_RESAMPLE(ch1, ch2, ch3, ch4, ch5, ch6, ch7, ch8) \ + ch8<<7 | ch7<<6 | ch6<<5 | ch5<<4 | ch4<<3 | ch3<<2 | ch2<<1 | ch1<<0 + +static const uint8_t supported_resampling[MAX_CHANNELS] = { + //ouput channels:1 2 3 4 5 6 7 8 + SUPPORT_RESAMPLE(1, 1, 0, 0, 0, 0, 0, 0), // 1 input channel + SUPPORT_RESAMPLE(1, 1, 0, 0, 0, 1, 0, 0), // 2 input channels + SUPPORT_RESAMPLE(0, 0, 1, 0, 0, 0, 0, 0), // 3 input channels + SUPPORT_RESAMPLE(0, 0, 0, 1, 0, 0, 0, 0), // 4 input channels + SUPPORT_RESAMPLE(0, 0, 0, 0, 1, 0, 0, 0), // 5 input channels + SUPPORT_RESAMPLE(0, 1, 0, 0, 0, 1, 0, 0), // 6 input channels + SUPPORT_RESAMPLE(0, 0, 0, 0, 0, 0, 1, 0), // 7 input channels + SUPPORT_RESAMPLE(0, 0, 0, 0, 0, 0, 0, 1), // 8 input channels +}; + ReSampleContext *av_audio_resample_init(int output_channels, int input_channels, int output_rate, int input_rate, enum AVSampleFormat sample_fmt_out, @@ -195,11 +210,15 @@ ReSampleContext *av_audio_resample_init(int output_channels, int input_channels, MAX_CHANNELS); return NULL; } - if (output_channels > 2 && - !(output_channels == 6 && input_channels == 2) && - output_channels != input_channels) { - av_log(NULL, AV_LOG_ERROR, - "Resampling output channel count must be 1 or 2 for mono input; 1, 2 or 6 for stereo input; or N for N channel input.\n"); + if (!(supported_resampling[input_channels-1] & (1<<(output_channels-1)))) { + int i; + av_log(NULL, AV_LOG_ERROR, "Unsupported audio resampling. Allowed " + "output channels for %d input channel%s", input_channels, + input_channels > 1 ? "s:" : ":"); + for (i = 0; i < MAX_CHANNELS; i++) + if (supported_resampling[input_channels-1] & (1<