C++ (Cpp) mp_audio_realloc примеры использования

Пример #1

Файл: af_lavcac3enc.c Проект: xylosper/bomi

// Initialization and runtime control
static int control(struct af_instance *af, int cmd, void *arg)
{
    af_ac3enc_t *s  = af->priv;
    static const int default_bit_rate[AC3_MAX_CHANNELS+1] = \
        {0, 96000, 192000, 256000, 384000, 448000, 448000};

    switch (cmd){
    case AF_CONTROL_REINIT: {
        struct mp_audio *in = arg;
        struct mp_audio orig_in = *in;

        if (AF_FORMAT_IS_SPECIAL(in->format) || in->nch < s->cfg_min_channel_num)
            return AF_DETACH;

        mp_audio_set_format(in, s->in_sampleformat);

        if (in->rate != 48000 && in->rate != 44100 && in->rate != 32000)
            in->rate = 48000;
        af->data->rate = in->rate;

        mp_chmap_reorder_to_lavc(&in->channels);
        if (in->nch > AC3_MAX_CHANNELS)
            mp_audio_set_num_channels(in, AC3_MAX_CHANNELS);

        mp_audio_set_format(af->data, AF_FORMAT_S_AC3);
        mp_audio_set_num_channels(af->data, 2);

        if (!mp_audio_config_equals(in, &orig_in))
            return AF_FALSE;

        s->in_samples = AC3_FRAME_SIZE;
        if (s->cfg_add_iec61937_header) {
            s->out_samples = AC3_FRAME_SIZE;
        } else {
            s->out_samples = AC3_MAX_CODED_FRAME_SIZE / af->data->sstride;
        }

        mp_audio_copy_config(s->input, in);
        mp_audio_realloc(s->input, s->in_samples);
        s->input->samples = 0;

        talloc_free(s->pending);
        s->pending = NULL;

        MP_DBG(af, "af_lavcac3enc reinit: %d, %d, %d.\n",
               in->nch, in->rate, s->in_samples);

        int bit_rate = s->bit_rate ? s->bit_rate : default_bit_rate[in->nch];

        if (s->lavc_actx->channels != in->nch ||
            s->lavc_actx->sample_rate != in->rate ||
            s->lavc_actx->bit_rate != bit_rate)
        {
            avcodec_close(s->lavc_actx);

            // Put sample parameters
            s->lavc_actx->channels = in->nch;
            s->lavc_actx->channel_layout = mp_chmap_to_lavc(&in->channels);
            s->lavc_actx->sample_rate = in->rate;
            s->lavc_actx->bit_rate = bit_rate;

            if (avcodec_open2(s->lavc_actx, s->lavc_acodec, NULL) < 0) {
                MP_ERR(af, "Couldn't open codec %s, br=%d.\n", "ac3", bit_rate);
                return AF_ERROR;
            }
        }
        if (s->lavc_actx->frame_size != AC3_FRAME_SIZE) {
            MP_ERR(af, "lavcac3enc: unexpected ac3 "
                   "encoder frame size %d\n", s->lavc_actx->frame_size);
            return AF_ERROR;
        }
        return AF_OK;
    }
    }
    return AF_UNKNOWN;
}

Пример #2

Файл: af_lavcac3enc.c Проект: chyiz/mpv

// Initialization and runtime control
static int control(struct af_instance *af, int cmd, void *arg)
{
    af_ac3enc_t *s  = af->priv;
    static const int default_bit_rate[AC3_MAX_CHANNELS+1] = \
        {0, 96000, 192000, 256000, 384000, 448000, 448000};

    switch (cmd){
    case AF_CONTROL_REINIT: {
        struct mp_audio *in = arg;
        struct mp_audio orig_in = *in;

        if (!af_fmt_is_pcm(in->format) || in->nch < s->cfg_min_channel_num)
            return AF_DETACH;

        // At least currently, the AC3 encoder doesn't export sample rates.
        in->rate = 48000;
        select_encode_format(s->lavc_actx, in);

        af->data->rate = in->rate;
        mp_audio_set_format(af->data, AF_FORMAT_S_AC3);
        mp_audio_set_num_channels(af->data, 2);

        if (!mp_audio_config_equals(in, &orig_in))
            return AF_FALSE;

        if (s->cfg_add_iec61937_header) {
            s->out_samples = AC3_FRAME_SIZE;
        } else {
            s->out_samples = AC3_MAX_CODED_FRAME_SIZE / af->data->sstride;
        }

        mp_audio_copy_config(s->input, in);

        talloc_free(s->pending);
        s->pending = NULL;

        MP_DBG(af, "reinit: %d, %d, %d.\n", in->nch, in->rate, s->in_samples);

        int bit_rate = s->bit_rate ? s->bit_rate : default_bit_rate[in->nch];

        if (s->lavc_actx->channels != in->nch ||
            s->lavc_actx->sample_rate != in->rate ||
            s->lavc_actx->bit_rate != bit_rate)
        {
            avcodec_close(s->lavc_actx);

            // Put sample parameters
            s->lavc_actx->sample_fmt = af_to_avformat(in->format);
            s->lavc_actx->channels = in->nch;
            s->lavc_actx->channel_layout = mp_chmap_to_lavc(&in->channels);
            s->lavc_actx->sample_rate = in->rate;
            s->lavc_actx->bit_rate = bit_rate;

            if (avcodec_open2(s->lavc_actx, s->lavc_acodec, NULL) < 0) {
                MP_ERR(af, "Couldn't open codec %s, br=%d.\n", "ac3", bit_rate);
                return AF_ERROR;
            }

            if (s->lavc_actx->frame_size < 1) {
                MP_ERR(af, "encoder didn't specify input frame size\n");
                return AF_ERROR;
            }
        }
        s->in_samples = s->lavc_actx->frame_size;
        mp_audio_realloc(s->input, s->in_samples);
        s->input->samples = 0;
        s->encoder_buffered = 0;
        return AF_OK;
    }
    case AF_CONTROL_RESET:
        if (avcodec_is_open(s->lavc_actx))
            avcodec_flush_buffers(s->lavc_actx);
        talloc_free(s->pending);
        s->pending = NULL;
        s->input->samples = 0;
        s->encoder_buffered = 0;
        return AF_OK;
    }
    return AF_UNKNOWN;
}