fre 2020-01-03 klockan 16:56 +0100 skrev Nicolas Gaullier:
> Similar to ff_spdif_probe() with two additionnal parameters:
> - an AVClass for logging
> - the bit resolution of the container as it may be 16 or 24 for s337m
> ---
> libavformat/s337m.c | 35 +++++++++++++++++++++++++++++++++++
> libavformat/s337m.h | 19 +++++++++++++++++++
> 2 files changed, 54 insertions(+)
>
> diff --git a/libavformat/s337m.c b/libavformat/s337m.c
> index 5c8ab2649c..dc62d6ab98 100644
> --- a/libavformat/s337m.c
> +++ b/libavformat/s337m.c
> @@ -133,6 +133,41 @@ static int s337m_probe(const AVProbeData *p)
> return 0;
> }
>
> +int ff_s337m_probe(const uint8_t *buf, int size, enum AVCodecID *codec, void
> *avc, int container_word_bits)
> +{
> + int pos = 0;
> + int consecutive_codes = 0;
> +
> + if ( size < S337M_MIN_OFFSET)
> + return 0;
> + size = FFMIN(2 * S337M_MAX_OFFSET, size);
> +
> + do {
> + uint64_t state;
> + int data_type, data_size, offset;
> + while (pos < size - 12 && !buf[pos]) {
> + pos++;
> + }
> + if (pos >= size - 12 || pos < S337M_PROBE_GUARDBAND_MIN_BYTES)
> + return 0;
> + state = container_word_bits == 16 ? AV_RB32(buf + pos) : AV_RB48(buf
> + pos);
> + if (!IS_LE_MARKER(state))
> + return 0;
> + data_type = container_word_bits == 16 ? AV_RL16(buf + pos + 4) :
> AV_RL24(buf + pos + 6);
> + data_size = container_word_bits == 16 ? AV_RL16(buf + pos + 6) :
> AV_RL24(buf + pos + 9);
> + if (s337m_get_offset_and_codec(avc, state, data_type, data_size,
> container_word_bits, &offset, codec))
> + return 0;
Looks OK
> + if (avc) {
> + double s337m_phase = pos * 4. / container_word_bits / 48000;
> + av_log(avc, AV_LOG_INFO, "s337m sample %d detected with phase =
> %.6fs\n", consecutive_codes, s337m_phase);
> + if (*codec == AV_CODEC_ID_DOLBY_E && (s337m_phase <
> DOLBY_E_PHASE_MIN || s337m_phase > DOLBY_E_PHASE_MAX))
> + av_log(avc, AV_LOG_WARNING, "Dolby E phase is out of
> valid range (%.6fs-%.6fs)\n", DOLBY_E_PHASE_MIN, DOLBY_E_PHASE_MAX);
Still not a huge fan of this "phase" notion here, but I suppose it's
nothing to get hung up about
/Tomas
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