Function flac_encode_frame

libavcodec/flacenc.c:1175–1240

}

static int flac_encode_frame(AVCodecContext *avctx, uint8_t *frame,
                             int buf_size, void *data)
{
    int ch;
    FlacEncodeContext *s;
    int16_t *samples = data;
    int out_bytes;
    int reencoded=0;

    s = avctx->priv_data;

    if(buf_size < s->max_framesize*2) {
        av_log(avctx, AV_LOG_ERROR, "output buffer too small\n");
        return 0;
    }

    /* when the last block is reached, update the header in extradata */
    if (!data) {
        s->max_framesize = s->max_encoded_framesize;
        av_md5_final(s->md5ctx, s->md5sum);
        write_streaminfo(s, avctx->extradata);
        return 0;
    }

    init_frame(s);

    copy_samples(s, samples);

    channel_decorrelation(s);

    for(ch=0; ch<s->channels; ch++) {
        encode_residual(s, ch);
    }

write_frame:
    init_put_bits(&s->pb, frame, buf_size);
    output_frame_header(s);
    output_subframes(s);
    output_frame_footer(s);
    out_bytes = put_bits_count(&s->pb) >> 3;

    if(out_bytes > s->max_framesize) {
        if(reencoded) {
            /* still too large. must be an error. */
            av_log(avctx, AV_LOG_ERROR, "error encoding frame\n");
            return -1;
        }

        /* frame too large. use verbatim mode */
        for(ch=0; ch<s->channels; ch++) {
            encode_residual_v(s, ch);
        }
        reencoded = 1;
        goto write_frame;
    }

    s->frame_count++;
    s->sample_count += avctx->frame_size;