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typedef struct SampleFmtInfo {
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/** this table gives more information about formats */
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static const SampleFmtInfo sample_fmt_info[AV_SAMPLE_FMT_NB] = {
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[AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8 },
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[AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16 },
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[AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32 },
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[AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32 },
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[AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64 },
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[AV_SAMPLE_FMT_U8] = { .name = "u8", .bits = 8, .planar = 0 },
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[AV_SAMPLE_FMT_S16] = { .name = "s16", .bits = 16, .planar = 0 },
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[AV_SAMPLE_FMT_S32] = { .name = "s32", .bits = 32, .planar = 0 },
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[AV_SAMPLE_FMT_FLT] = { .name = "flt", .bits = 32, .planar = 0 },
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[AV_SAMPLE_FMT_DBL] = { .name = "dbl", .bits = 64, .planar = 0 },
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[AV_SAMPLE_FMT_U8P] = { .name = "u8p", .bits = 8, .planar = 1 },
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[AV_SAMPLE_FMT_S16P] = { .name = "s16p", .bits = 16, .planar = 1 },
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[AV_SAMPLE_FMT_S32P] = { .name = "s32p", .bits = 32, .planar = 1 },
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[AV_SAMPLE_FMT_FLTP] = { .name = "fltp", .bits = 32, .planar = 1 },
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[AV_SAMPLE_FMT_DBLP] = { .name = "dblp", .bits = 64, .planar = 1 },
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const char *av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
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0 : sample_fmt_info[sample_fmt].bits;
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int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
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if (sample_fmt < 0 || sample_fmt >= AV_SAMPLE_FMT_NB)
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return sample_fmt_info[sample_fmt].planar;
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int av_samples_get_buffer_size(int *linesize, int nb_channels, int nb_samples,
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enum AVSampleFormat sample_fmt, int align)
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int sample_size = av_get_bytes_per_sample(sample_fmt);
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int planar = av_sample_fmt_is_planar(sample_fmt);
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/* validate parameter ranges */
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if (!sample_size || nb_samples <= 0 || nb_channels <= 0)
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return AVERROR(EINVAL);
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/* check for integer overflow */
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if (nb_channels > INT_MAX / align ||
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(int64_t)nb_channels * nb_samples > (INT_MAX - (align * nb_channels)) / sample_size)
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return AVERROR(EINVAL);
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line_size = planar ? FFALIGN(nb_samples * sample_size, align) :
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FFALIGN(nb_samples * sample_size * nb_channels, align);
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*linesize = line_size;
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return planar ? line_size * nb_channels : line_size;
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int av_samples_fill_arrays(uint8_t **audio_data, int *linesize,
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uint8_t *buf, int nb_channels, int nb_samples,
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enum AVSampleFormat sample_fmt, int align)
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int ch, planar, buf_size;
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planar = av_sample_fmt_is_planar(sample_fmt);
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buf_size = av_samples_get_buffer_size(linesize, nb_channels, nb_samples,
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for (ch = 1; planar && ch < nb_channels; ch++)
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audio_data[ch] = audio_data[ch-1] + *linesize;
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int av_samples_alloc(uint8_t **audio_data, int *linesize, int nb_channels,
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int nb_samples, enum AVSampleFormat sample_fmt, int align)
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int size = av_samples_get_buffer_size(NULL, nb_channels, nb_samples,
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buf = av_mallocz(size);
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return AVERROR(ENOMEM);
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size = av_samples_fill_arrays(audio_data, linesize, buf, nb_channels,
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nb_samples, sample_fmt, align);