Пример #1
0
static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
                            const AVFrame *frame, int *got_packet_ptr)
{
    AACEncContext *s = avctx->priv_data;
    float **samples = s->planar_samples, *samples2, *la, *overlap;
    ChannelElement *cpe;
    SingleChannelElement *sce;
    IndividualChannelStream *ics;
    int i, its, ch, w, chans, tag, start_ch, ret, frame_bits;
    int target_bits, rate_bits, too_many_bits, too_few_bits;
    int ms_mode = 0, is_mode = 0, tns_mode = 0, pred_mode = 0;
    int chan_el_counter[4];
    FFPsyWindowInfo windows[AAC_MAX_CHANNELS];

    if (s->last_frame == 2)
        return 0;

    /* add current frame to queue */
    if (frame) {
        if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
            return ret;
    }

    copy_input_samples(s, frame);
    if (s->psypp)
        ff_psy_preprocess(s->psypp, s->planar_samples, s->channels);

    if (!avctx->frame_number)
        return 0;

    start_ch = 0;
    for (i = 0; i < s->chan_map[0]; i++) {
        FFPsyWindowInfo* wi = windows + start_ch;
        tag      = s->chan_map[i+1];
        chans    = tag == TYPE_CPE ? 2 : 1;
        cpe      = &s->cpe[i];
        for (ch = 0; ch < chans; ch++) {
            float clip_avoidance_factor;
            sce = &cpe->ch[ch];
            ics = &sce->ics;
            s->cur_channel = start_ch + ch;
            overlap  = &samples[s->cur_channel][0];
            samples2 = overlap + 1024;
            la       = samples2 + (448+64);
            if (!frame)
                la = NULL;
            if (tag == TYPE_LFE) {
                wi[ch].window_type[0] = ONLY_LONG_SEQUENCE;
                wi[ch].window_shape   = 0;
                wi[ch].num_windows    = 1;
                wi[ch].grouping[0]    = 1;

                /* Only the lowest 12 coefficients are used in a LFE channel.
                 * The expression below results in only the bottom 8 coefficients
                 * being used for 11.025kHz to 16kHz sample rates.
                 */
                ics->num_swb = s->samplerate_index >= 8 ? 1 : 3;
            } else {
                wi[ch] = s->psy.model->window(&s->psy, samples2, la, s->cur_channel,
                                              ics->window_sequence[0]);
            }
            ics->window_sequence[1] = ics->window_sequence[0];
            ics->window_sequence[0] = wi[ch].window_type[0];
            ics->use_kb_window[1]   = ics->use_kb_window[0];
            ics->use_kb_window[0]   = wi[ch].window_shape;
            ics->num_windows        = wi[ch].num_windows;
            ics->swb_sizes          = s->psy.bands    [ics->num_windows == 8];
            ics->num_swb            = tag == TYPE_LFE ? ics->num_swb : s->psy.num_bands[ics->num_windows == 8];
            ics->max_sfb            = FFMIN(ics->max_sfb, ics->num_swb);
            ics->swb_offset         = wi[ch].window_type[0] == EIGHT_SHORT_SEQUENCE ?
                                        ff_swb_offset_128 [s->samplerate_index]:
                                        ff_swb_offset_1024[s->samplerate_index];
            ics->tns_max_bands      = wi[ch].window_type[0] == EIGHT_SHORT_SEQUENCE ?
                                        ff_tns_max_bands_128 [s->samplerate_index]:
                                        ff_tns_max_bands_1024[s->samplerate_index];
            clip_avoidance_factor = 0.0f;
            for (w = 0; w < ics->num_windows; w++)
                ics->group_len[w] = wi[ch].grouping[w];
            for (w = 0; w < ics->num_windows; w++) {
                if (wi[ch].clipping[w] > CLIP_AVOIDANCE_FACTOR) {
                    ics->window_clipping[w] = 1;
                    clip_avoidance_factor = FFMAX(clip_avoidance_factor, wi[ch].clipping[w]);
                } else {
                    ics->window_clipping[w] = 0;
                }
            }
            if (clip_avoidance_factor > CLIP_AVOIDANCE_FACTOR) {
                ics->clip_avoidance_factor = CLIP_AVOIDANCE_FACTOR / clip_avoidance_factor;
            } else {
                ics->clip_avoidance_factor = 1.0f;
            }

            apply_window_and_mdct(s, sce, overlap);

            if (s->options.ltp && s->coder->update_ltp) {
                s->coder->update_ltp(s, sce);
                apply_window[sce->ics.window_sequence[0]](s->fdsp, sce, &sce->ltp_state[0]);
                s->mdct1024.mdct_calc(&s->mdct1024, sce->lcoeffs, sce->ret_buf);
            }

            if (!(isfinite(cpe->ch[ch].coeffs[    0]) &&
                  isfinite(cpe->ch[ch].coeffs[  128]) &&
                  isfinite(cpe->ch[ch].coeffs[2*128]) &&
                  isfinite(cpe->ch[ch].coeffs[3*128]) &&
                  isfinite(cpe->ch[ch].coeffs[4*128]) &&
                  isfinite(cpe->ch[ch].coeffs[5*128]) &&
                  isfinite(cpe->ch[ch].coeffs[6*128]) &&
                  isfinite(cpe->ch[ch].coeffs[7*128]))
            ) {
                av_log(avctx, AV_LOG_ERROR, "Input contains NaN/+-Inf\n");
                return AVERROR(EINVAL);
            }
            avoid_clipping(s, sce);
        }
        start_ch += chans;
    }
    if ((ret = ff_alloc_packet2(avctx, avpkt, 8192 * s->channels, 0)) < 0)
        return ret;
    frame_bits = its = 0;
    do {
        init_put_bits(&s->pb, avpkt->data, avpkt->size);

        if ((avctx->frame_number & 0xFF)==1 && !(avctx->flags & AV_CODEC_FLAG_BITEXACT))
            put_bitstream_info(s, LIBAVCODEC_IDENT);
        start_ch = 0;
        target_bits = 0;
        memset(chan_el_counter, 0, sizeof(chan_el_counter));
        for (i = 0; i < s->chan_map[0]; i++) {
            FFPsyWindowInfo* wi = windows + start_ch;
            const float *coeffs[2];
            tag      = s->chan_map[i+1];
            chans    = tag == TYPE_CPE ? 2 : 1;
            cpe      = &s->cpe[i];
            cpe->common_window = 0;
            memset(cpe->is_mask, 0, sizeof(cpe->is_mask));
            memset(cpe->ms_mask, 0, sizeof(cpe->ms_mask));
            put_bits(&s->pb, 3, tag);
            put_bits(&s->pb, 4, chan_el_counter[tag]++);
            for (ch = 0; ch < chans; ch++) {
                sce = &cpe->ch[ch];
                coeffs[ch] = sce->coeffs;
                sce->ics.predictor_present = 0;
                sce->ics.ltp.present = 0;
                memset(sce->ics.ltp.used, 0, sizeof(sce->ics.ltp.used));
                memset(sce->ics.prediction_used, 0, sizeof(sce->ics.prediction_used));
                memset(&sce->tns, 0, sizeof(TemporalNoiseShaping));
                for (w = 0; w < 128; w++)
                    if (sce->band_type[w] > RESERVED_BT)
                        sce->band_type[w] = 0;
            }
            s->psy.bitres.alloc = -1;
            s->psy.bitres.bits = s->last_frame_pb_count / s->channels;
            s->psy.model->analyze(&s->psy, start_ch, coeffs, wi);
            if (s->psy.bitres.alloc > 0) {
                /* Lambda unused here on purpose, we need to take psy's unscaled allocation */
                target_bits += s->psy.bitres.alloc
                    * (s->lambda / (avctx->global_quality ? avctx->global_quality : 120));
                s->psy.bitres.alloc /= chans;
            }
            s->cur_type = tag;
            for (ch = 0; ch < chans; ch++) {
                s->cur_channel = start_ch + ch;
                if (s->options.pns && s->coder->mark_pns)
                    s->coder->mark_pns(s, avctx, &cpe->ch[ch]);
                s->coder->search_for_quantizers(avctx, s, &cpe->ch[ch], s->lambda);
            }
            if (chans > 1
                && wi[0].window_type[0] == wi[1].window_type[0]
                && wi[0].window_shape   == wi[1].window_shape) {

                cpe->common_window = 1;
                for (w = 0; w < wi[0].num_windows; w++) {
                    if (wi[0].grouping[w] != wi[1].grouping[w]) {
                        cpe->common_window = 0;
                        break;
                    }
                }
            }
            for (ch = 0; ch < chans; ch++) { /* TNS and PNS */
                sce = &cpe->ch[ch];
                s->cur_channel = start_ch + ch;
                if (s->options.tns && s->coder->search_for_tns)
                    s->coder->search_for_tns(s, sce);
                if (s->options.tns && s->coder->apply_tns_filt)
                    s->coder->apply_tns_filt(s, sce);
                if (sce->tns.present)
                    tns_mode = 1;
                if (s->options.pns && s->coder->search_for_pns)
                    s->coder->search_for_pns(s, avctx, sce);
            }
            s->cur_channel = start_ch;
            if (s->options.intensity_stereo) { /* Intensity Stereo */
                if (s->coder->search_for_is)
                    s->coder->search_for_is(s, avctx, cpe);
                if (cpe->is_mode) is_mode = 1;
                apply_intensity_stereo(cpe);
            }
            if (s->options.pred) { /* Prediction */
                for (ch = 0; ch < chans; ch++) {
                    sce = &cpe->ch[ch];
                    s->cur_channel = start_ch + ch;
                    if (s->options.pred && s->coder->search_for_pred)
                        s->coder->search_for_pred(s, sce);
                    if (cpe->ch[ch].ics.predictor_present) pred_mode = 1;
                }
                if (s->coder->adjust_common_pred)
                    s->coder->adjust_common_pred(s, cpe);
                for (ch = 0; ch < chans; ch++) {
                    sce = &cpe->ch[ch];
                    s->cur_channel = start_ch + ch;
                    if (s->options.pred && s->coder->apply_main_pred)
                        s->coder->apply_main_pred(s, sce);
                }
                s->cur_channel = start_ch;
            }
            if (s->options.mid_side) { /* Mid/Side stereo */
                if (s->options.mid_side == -1 && s->coder->search_for_ms)
                    s->coder->search_for_ms(s, cpe);
                else if (cpe->common_window)
                    memset(cpe->ms_mask, 1, sizeof(cpe->ms_mask));
                apply_mid_side_stereo(cpe);
            }
            adjust_frame_information(cpe, chans);
            if (s->options.ltp) { /* LTP */
                for (ch = 0; ch < chans; ch++) {
                    sce = &cpe->ch[ch];
                    s->cur_channel = start_ch + ch;
                    if (s->coder->search_for_ltp)
                        s->coder->search_for_ltp(s, sce, cpe->common_window);
                    if (sce->ics.ltp.present) pred_mode = 1;
                }
                s->cur_channel = start_ch;
                if (s->coder->adjust_common_ltp)
                    s->coder->adjust_common_ltp(s, cpe);
            }
            if (chans == 2) {
                put_bits(&s->pb, 1, cpe->common_window);
                if (cpe->common_window) {
                    put_ics_info(s, &cpe->ch[0].ics);
                    if (s->coder->encode_main_pred)
                        s->coder->encode_main_pred(s, &cpe->ch[0]);
                    if (s->coder->encode_ltp_info)
                        s->coder->encode_ltp_info(s, &cpe->ch[0], 1);
                    encode_ms_info(&s->pb, cpe);
                    if (cpe->ms_mode) ms_mode = 1;
                }
            }
            for (ch = 0; ch < chans; ch++) {
                s->cur_channel = start_ch + ch;
                encode_individual_channel(avctx, s, &cpe->ch[ch], cpe->common_window);
            }
            start_ch += chans;
        }

        if (avctx->flags & CODEC_FLAG_QSCALE) {
            /* When using a constant Q-scale, don't mess with lambda */
            break;
        }

        /* rate control stuff
         * allow between the nominal bitrate, and what psy's bit reservoir says to target
         * but drift towards the nominal bitrate always
         */
        frame_bits = put_bits_count(&s->pb);
        rate_bits = avctx->bit_rate * 1024 / avctx->sample_rate;
        rate_bits = FFMIN(rate_bits, 6144 * s->channels - 3);
        too_many_bits = FFMAX(target_bits, rate_bits);
        too_many_bits = FFMIN(too_many_bits, 6144 * s->channels - 3);
        too_few_bits = FFMIN(FFMAX(rate_bits - rate_bits/4, target_bits), too_many_bits);

        /* When using ABR, be strict (but only for increasing) */
        too_few_bits = too_few_bits - too_few_bits/8;
        too_many_bits = too_many_bits + too_many_bits/2;

        if (   its == 0 /* for steady-state Q-scale tracking */
            || (its < 5 && (frame_bits < too_few_bits || frame_bits > too_many_bits))
            || frame_bits >= 6144 * s->channels - 3  )
        {
            float ratio = ((float)rate_bits) / frame_bits;

            if (frame_bits >= too_few_bits && frame_bits <= too_many_bits) {
                /*
                 * This path is for steady-state Q-scale tracking
                 * When frame bits fall within the stable range, we still need to adjust
                 * lambda to maintain it like so in a stable fashion (large jumps in lambda
                 * create artifacts and should be avoided), but slowly
                 */
                ratio = sqrtf(sqrtf(ratio));
                ratio = av_clipf(ratio, 0.9f, 1.1f);
            } else {
                /* Not so fast though */
                ratio = sqrtf(ratio);
            }
            s->lambda = FFMIN(s->lambda * ratio, 65536.f);

            /* Keep iterating if we must reduce and lambda is in the sky */
            if (ratio > 0.9f && ratio < 1.1f) {
                break;
            } else {
                if (is_mode || ms_mode || tns_mode || pred_mode) {
                    for (i = 0; i < s->chan_map[0]; i++) {
                        // Must restore coeffs
                        chans = tag == TYPE_CPE ? 2 : 1;
                        cpe = &s->cpe[i];
                        for (ch = 0; ch < chans; ch++)
                            memcpy(cpe->ch[ch].coeffs, cpe->ch[ch].pcoeffs, sizeof(cpe->ch[ch].coeffs));
                    }
                }
                its++;
            }
        } else {
            break;
        }
    } while (1);

    if (s->options.ltp && s->coder->ltp_insert_new_frame)
        s->coder->ltp_insert_new_frame(s);

    put_bits(&s->pb, 3, TYPE_END);
    flush_put_bits(&s->pb);

    s->last_frame_pb_count = put_bits_count(&s->pb);

    s->lambda_sum += s->lambda;
    s->lambda_count++;

    if (!frame)
        s->last_frame++;

    ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
                       &avpkt->duration);

    avpkt->size = put_bits_count(&s->pb) >> 3;
    *got_packet_ptr = 1;
    return 0;
}
Пример #2
0
static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
                            const AVFrame *frame, int *got_packet_ptr)
{
    AACEncContext *s = avctx->priv_data;
    float **samples = s->planar_samples, *samples2, *la, *overlap;
    ChannelElement *cpe;
    int i, ch, w, g, chans, tag, start_ch, ret;
    int chan_el_counter[4];
    FFPsyWindowInfo windows[AAC_MAX_CHANNELS];

    if (s->last_frame == 2)
        return 0;

    /* add current frame to queue */
    if (frame) {
        if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
            return ret;
    }

    copy_input_samples(s, frame);
    if (s->psypp)
        ff_psy_preprocess(s->psypp, s->planar_samples, s->channels);

    if (!avctx->frame_number)
        return 0;

    start_ch = 0;
    for (i = 0; i < s->chan_map[0]; i++) {
        FFPsyWindowInfo* wi = windows + start_ch;
        tag      = s->chan_map[i+1];
        chans    = tag == TYPE_CPE ? 2 : 1;
        cpe      = &s->cpe[i];
        for (ch = 0; ch < chans; ch++) {
            IndividualChannelStream *ics = &cpe->ch[ch].ics;
            int cur_channel = start_ch + ch;
            overlap  = &samples[cur_channel][0];
            samples2 = overlap + 1024;
            la       = samples2 + (448+64);
            if (!frame)
                la = NULL;
            if (tag == TYPE_LFE) {
                wi[ch].window_type[0] = ONLY_LONG_SEQUENCE;
                wi[ch].window_shape   = 0;
                wi[ch].num_windows    = 1;
                wi[ch].grouping[0]    = 1;

                /* Only the lowest 12 coefficients are used in a LFE channel.
                 * The expression below results in only the bottom 8 coefficients
                 * being used for 11.025kHz to 16kHz sample rates.
                 */
                ics->num_swb = s->samplerate_index >= 8 ? 1 : 3;
            } else {
                wi[ch] = s->psy.model->window(&s->psy, samples2, la, cur_channel,
                                              ics->window_sequence[0]);
            }
            ics->window_sequence[1] = ics->window_sequence[0];
            ics->window_sequence[0] = wi[ch].window_type[0];
            ics->use_kb_window[1]   = ics->use_kb_window[0];
            ics->use_kb_window[0]   = wi[ch].window_shape;
            ics->num_windows        = wi[ch].num_windows;
            ics->swb_sizes          = s->psy.bands    [ics->num_windows == 8];
            ics->num_swb            = tag == TYPE_LFE ? ics->num_swb : s->psy.num_bands[ics->num_windows == 8];
            for (w = 0; w < ics->num_windows; w++)
                ics->group_len[w] = wi[ch].grouping[w];

            apply_window_and_mdct(s, &cpe->ch[ch], overlap);
        }
        start_ch += chans;
    }
    if ((ret = ff_alloc_packet2(avctx, avpkt, 8192 * s->channels)) < 0)
        return ret;
    do {
        int frame_bits;

        init_put_bits(&s->pb, avpkt->data, avpkt->size);

        if ((avctx->frame_number & 0xFF)==1 && !(avctx->flags & CODEC_FLAG_BITEXACT))
            put_bitstream_info(s, LIBAVCODEC_IDENT);
        start_ch = 0;
        memset(chan_el_counter, 0, sizeof(chan_el_counter));
        for (i = 0; i < s->chan_map[0]; i++) {
            FFPsyWindowInfo* wi = windows + start_ch;
            const float *coeffs[2];
            tag      = s->chan_map[i+1];
            chans    = tag == TYPE_CPE ? 2 : 1;
            cpe      = &s->cpe[i];
            put_bits(&s->pb, 3, tag);
            put_bits(&s->pb, 4, chan_el_counter[tag]++);
            for (ch = 0; ch < chans; ch++)
                coeffs[ch] = cpe->ch[ch].coeffs;
            s->psy.model->analyze(&s->psy, start_ch, coeffs, wi);
            for (ch = 0; ch < chans; ch++) {
                s->cur_channel = start_ch * 2 + ch;
                s->coder->search_for_quantizers(avctx, s, &cpe->ch[ch], s->lambda);
            }
            cpe->common_window = 0;
            if (chans > 1
                && wi[0].window_type[0] == wi[1].window_type[0]
                && wi[0].window_shape   == wi[1].window_shape) {

                cpe->common_window = 1;
                for (w = 0; w < wi[0].num_windows; w++) {
                    if (wi[0].grouping[w] != wi[1].grouping[w]) {
                        cpe->common_window = 0;
                        break;
                    }
                }
            }
            s->cur_channel = start_ch * 2;
            if (s->options.stereo_mode && cpe->common_window) {
                if (s->options.stereo_mode > 0) {
                    IndividualChannelStream *ics = &cpe->ch[0].ics;
                    for (w = 0; w < ics->num_windows; w += ics->group_len[w])
                        for (g = 0;  g < ics->num_swb; g++)
                            cpe->ms_mask[w*16+g] = 1;
                } else if (s->coder->search_for_ms) {
                    s->coder->search_for_ms(s, cpe, s->lambda);
                }
            }
            adjust_frame_information(cpe, chans);
            if (chans == 2) {
                put_bits(&s->pb, 1, cpe->common_window);
                if (cpe->common_window) {
                    put_ics_info(s, &cpe->ch[0].ics);
                    encode_ms_info(&s->pb, cpe);
                }
            }
            for (ch = 0; ch < chans; ch++) {
                s->cur_channel = start_ch + ch;
                encode_individual_channel(avctx, s, &cpe->ch[ch], cpe->common_window);
            }
            start_ch += chans;
        }

        frame_bits = put_bits_count(&s->pb);
        if (frame_bits <= 6144 * s->channels - 3) {
            s->psy.bitres.bits = frame_bits / s->channels;
            break;
        }

        s->lambda *= avctx->bit_rate * 1024.0f / avctx->sample_rate / frame_bits;

    } while (1);

    put_bits(&s->pb, 3, TYPE_END);
    flush_put_bits(&s->pb);
    avctx->frame_bits = put_bits_count(&s->pb);

    // rate control stuff
    if (!(avctx->flags & CODEC_FLAG_QSCALE)) {
        float ratio = avctx->bit_rate * 1024.0f / avctx->sample_rate / avctx->frame_bits;
        s->lambda *= ratio;
        s->lambda = FFMIN(s->lambda, 65536.f);
    }

    if (!frame)
        s->last_frame++;

    ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
                       &avpkt->duration);

    avpkt->size = put_bits_count(&s->pb) >> 3;
    *got_packet_ptr = 1;
    return 0;
}
Пример #3
0
static int aac_encode_frame(AVCodecContext *avctx,
                            uint8_t *frame, int buf_size, void *data)
{
    AACEncContext *s = avctx->priv_data;
    int16_t *samples = s->samples, *samples2, *la;
    ChannelElement *cpe;
    int i, ch, w, g, chans, tag, start_ch;
    int chan_el_counter[4];
    FFPsyWindowInfo windows[AAC_MAX_CHANNELS];

    if (s->last_frame)
        return 0;
    if (data) {
        if (!s->psypp) {
            if (avctx->channels <= 2) {
                memcpy(s->samples + 1024 * avctx->channels, data,
                       1024 * avctx->channels * sizeof(s->samples[0]));
            } else {
                for (i = 0; i < 1024; i++)
                    for (ch = 0; ch < avctx->channels; ch++)
                        s->samples[(i + 1024) * avctx->channels + ch] =
                            ((int16_t*)data)[i * avctx->channels +
                                             channel_maps[avctx->channels-1][ch]];
            }
        } else {
            start_ch = 0;
            samples2 = s->samples + 1024 * avctx->channels;
            for (i = 0; i < s->chan_map[0]; i++) {
                tag = s->chan_map[i+1];
                chans = tag == TYPE_CPE ? 2 : 1;
                ff_psy_preprocess(s->psypp,
                                  (uint16_t*)data + channel_maps[avctx->channels-1][start_ch],
                                  samples2 + start_ch, start_ch, chans);
                start_ch += chans;
            }
        }
    }
    if (!avctx->frame_number) {
        memcpy(s->samples, s->samples + 1024 * avctx->channels,
               1024 * avctx->channels * sizeof(s->samples[0]));
        return 0;
    }

    start_ch = 0;
    for (i = 0; i < s->chan_map[0]; i++) {
        FFPsyWindowInfo* wi = windows + start_ch;
        tag      = s->chan_map[i+1];
        chans    = tag == TYPE_CPE ? 2 : 1;
        cpe      = &s->cpe[i];
        for (ch = 0; ch < chans; ch++) {
            IndividualChannelStream *ics = &cpe->ch[ch].ics;
            int cur_channel = start_ch + ch;
            samples2 = samples + cur_channel;
            la       = samples2 + (448+64) * avctx->channels;
            if (!data)
                la = NULL;
            if (tag == TYPE_LFE) {
                wi[ch].window_type[0] = ONLY_LONG_SEQUENCE;
                wi[ch].window_shape   = 0;
                wi[ch].num_windows    = 1;
                wi[ch].grouping[0]    = 1;
            } else {
                wi[ch] = s->psy.model->window(&s->psy, samples2, la, cur_channel,
                                              ics->window_sequence[0]);
            }
            ics->window_sequence[1] = ics->window_sequence[0];
            ics->window_sequence[0] = wi[ch].window_type[0];
            ics->use_kb_window[1]   = ics->use_kb_window[0];
            ics->use_kb_window[0]   = wi[ch].window_shape;
            ics->num_windows        = wi[ch].num_windows;
            ics->swb_sizes          = s->psy.bands    [ics->num_windows == 8];
            ics->num_swb            = tag == TYPE_LFE ? 12 : s->psy.num_bands[ics->num_windows == 8];
            for (w = 0; w < ics->num_windows; w++)
                ics->group_len[w] = wi[ch].grouping[w];

            apply_window_and_mdct(avctx, s, &cpe->ch[ch], samples2);
        }
        start_ch += chans;
    }
    do {
        int frame_bits;
        init_put_bits(&s->pb, frame, buf_size*8);
        if ((avctx->frame_number & 0xFF)==1 && !(avctx->flags & CODEC_FLAG_BITEXACT))
            put_bitstream_info(avctx, s, LIBAVCODEC_IDENT);
        start_ch = 0;
        memset(chan_el_counter, 0, sizeof(chan_el_counter));
        for (i = 0; i < s->chan_map[0]; i++) {
            FFPsyWindowInfo* wi = windows + start_ch;
            const float *coeffs[2];
            tag      = s->chan_map[i+1];
            chans    = tag == TYPE_CPE ? 2 : 1;
            cpe      = &s->cpe[i];
            put_bits(&s->pb, 3, tag);
            put_bits(&s->pb, 4, chan_el_counter[tag]++);
            for (ch = 0; ch < chans; ch++)
                coeffs[ch] = cpe->ch[ch].coeffs;
            s->psy.model->analyze(&s->psy, start_ch, coeffs, wi);
            for (ch = 0; ch < chans; ch++) {
                s->cur_channel = start_ch * 2 + ch;
                s->coder->search_for_quantizers(avctx, s, &cpe->ch[ch], s->lambda);
            }
            cpe->common_window = 0;
            if (chans > 1
                && wi[0].window_type[0] == wi[1].window_type[0]
                && wi[0].window_shape   == wi[1].window_shape) {

                cpe->common_window = 1;
                for (w = 0; w < wi[0].num_windows; w++) {
                    if (wi[0].grouping[w] != wi[1].grouping[w]) {
                        cpe->common_window = 0;
                        break;
                    }
                }
            }
            s->cur_channel = start_ch * 2;
            if (s->options.stereo_mode && cpe->common_window) {
                if (s->options.stereo_mode > 0) {
                    IndividualChannelStream *ics = &cpe->ch[0].ics;
                    for (w = 0; w < ics->num_windows; w += ics->group_len[w])
                        for (g = 0;  g < ics->num_swb; g++)
                            cpe->ms_mask[w*16+g] = 1;
                } else if (s->coder->search_for_ms) {
                    s->coder->search_for_ms(s, cpe, s->lambda);
                }
            }
            adjust_frame_information(s, cpe, chans);
            if (chans == 2) {
                put_bits(&s->pb, 1, cpe->common_window);
                if (cpe->common_window) {
                    put_ics_info(s, &cpe->ch[0].ics);
                    encode_ms_info(&s->pb, cpe);
                }
            }
            for (ch = 0; ch < chans; ch++) {
                s->cur_channel = start_ch + ch;
                encode_individual_channel(avctx, s, &cpe->ch[ch], cpe->common_window);
            }
            start_ch += chans;
        }

        frame_bits = put_bits_count(&s->pb);
        if (frame_bits <= 6144 * avctx->channels - 3) {
            s->psy.bitres.bits = frame_bits / avctx->channels;
            break;
        }

        s->lambda *= avctx->bit_rate * 1024.0f / avctx->sample_rate / frame_bits;

    } while (1);

    put_bits(&s->pb, 3, TYPE_END);
    flush_put_bits(&s->pb);
    avctx->frame_bits = put_bits_count(&s->pb);

    // rate control stuff
    if (!(avctx->flags & CODEC_FLAG_QSCALE)) {
        float ratio = avctx->bit_rate * 1024.0f / avctx->sample_rate / avctx->frame_bits;
        s->lambda *= ratio;
        s->lambda = FFMIN(s->lambda, 65536.f);
    }

    if (!data)
        s->last_frame = 1;
    memcpy(s->samples, s->samples + 1024 * avctx->channels,
           1024 * avctx->channels * sizeof(s->samples[0]));
    return put_bits_count(&s->pb)>>3;
}
Пример #4
0
static int aac_encode_frame(AVCodecContext *avctx,
                            uint8_t *frame, int buf_size, void *data)
{
    AACEncContext *s = avctx->priv_data;
    int16_t *samples = s->samples, *samples2, *la;
    ChannelElement *cpe;
    int i, j, chans, tag, start_ch;
    const uint8_t *chan_map = aac_chan_configs[avctx->channels-1];
    int chan_el_counter[4];

    if(s->last_frame)
        return 0;
    if(data){
        if(!s->psypp){
            memcpy(s->samples + 1024 * avctx->channels, data, 1024 * avctx->channels * sizeof(s->samples[0]));
        }else{
            start_ch = 0;
            samples2 = s->samples + 1024 * avctx->channels;
            for(i = 0; i < chan_map[0]; i++){
                tag = chan_map[i+1];
                chans = tag == TYPE_CPE ? 2 : 1;
                ff_psy_preprocess(s->psypp, (uint16_t*)data + start_ch, samples2 + start_ch, start_ch, chans);
                start_ch += chans;
            }
        }
    }
    if(!avctx->frame_number){
        memcpy(s->samples, s->samples + 1024 * avctx->channels, 1024 * avctx->channels * sizeof(s->samples[0]));
        return 0;
    }

    init_put_bits(&s->pb, frame, buf_size*8);
    if((avctx->frame_number & 0xFF)==1 && !(avctx->flags & CODEC_FLAG_BITEXACT)){
        put_bitstream_info(avctx, s, LIBAVCODEC_IDENT);
    }
    start_ch = 0;
    memset(chan_el_counter, 0, sizeof(chan_el_counter));
    for(i = 0; i < chan_map[0]; i++){
        FFPsyWindowInfo wi[2];
        tag = chan_map[i+1];
        chans = tag == TYPE_CPE ? 2 : 1;
        cpe = &s->cpe[i];
        samples2 = samples + start_ch;
        la = samples2 + 1024 * avctx->channels + start_ch;
        if(!data) la = NULL;
        for(j = 0; j < chans; j++){
            IndividualChannelStream *ics = &cpe->ch[j].ics;
            int k;
            wi[j] = ff_psy_suggest_window(&s->psy, samples2, la, start_ch + j, ics->window_sequence[0]);
            ics->window_sequence[1] = ics->window_sequence[0];
            ics->window_sequence[0] = wi[j].window_type[0];
            ics->use_kb_window[1]   = ics->use_kb_window[0];
            ics->use_kb_window[0]   = wi[j].window_shape;
            ics->num_windows        = wi[j].num_windows;
            ics->swb_sizes          = s->psy.bands    [ics->num_windows == 8];
            ics->num_swb            = s->psy.num_bands[ics->num_windows == 8];
            for(k = 0; k < ics->num_windows; k++)
                ics->group_len[k] = wi[j].grouping[k];

            s->cur_channel = start_ch + j;
            apply_window_and_mdct(avctx, s, &cpe->ch[j], samples2, j);
            s->coder->search_for_quantizers(avctx, s, &cpe->ch[j], s->lambda);
        }
        cpe->common_window = 0;
        if(chans > 1
            && wi[0].window_type[0] == wi[1].window_type[0]
            && wi[0].window_shape   == wi[1].window_shape){

            cpe->common_window = 1;
            for(j = 0; j < wi[0].num_windows; j++){
                if(wi[0].grouping[j] != wi[1].grouping[j]){
                    cpe->common_window = 0;
                    break;
                }
            }
        }
        if(cpe->common_window && s->coder->search_for_ms)
            s->coder->search_for_ms(s, cpe, s->lambda);
        adjust_frame_information(s, cpe, chans);
        put_bits(&s->pb, 3, tag);
        put_bits(&s->pb, 4, chan_el_counter[tag]++);
        if(chans == 2){
            put_bits(&s->pb, 1, cpe->common_window);
            if(cpe->common_window){
                put_ics_info(s, &cpe->ch[0].ics);
                encode_ms_info(&s->pb, cpe);
            }
        }
        for(j = 0; j < chans; j++){
            s->cur_channel = start_ch + j;
            ff_psy_set_band_info(&s->psy, s->cur_channel, cpe->ch[j].coeffs, &wi[j]);
            encode_individual_channel(avctx, s, &cpe->ch[j], cpe->common_window);
        }
        start_ch += chans;
    }

    put_bits(&s->pb, 3, TYPE_END);
    flush_put_bits(&s->pb);
    avctx->frame_bits = put_bits_count(&s->pb);

    // rate control stuff
    if(!(avctx->flags & CODEC_FLAG_QSCALE)){
        float ratio = avctx->bit_rate * 1024.0f / avctx->sample_rate / avctx->frame_bits;
        s->lambda *= ratio;
    }

    if (avctx->frame_bits > 6144*avctx->channels) {
        av_log(avctx, AV_LOG_ERROR, "input buffer violation %d > %d.\n", avctx->frame_bits, 6144*avctx->channels);
    }

    if(!data)
        s->last_frame = 1;
    memcpy(s->samples, s->samples + 1024 * avctx->channels, 1024 * avctx->channels * sizeof(s->samples[0]));
    return put_bits_count(&s->pb)>>3;
}