// 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; }
// 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; }