Function save_bits

libavcodec/wmaprodec.c:1569–1614

*@brief Fill the bit reservoir with a (partial) frame. *@param s codec context *@param gb bitstream reader context *@param len length of the partial frame *@param append decides whether to reset the buffer or not */

 *@param append decides whether to reset the buffer or not
 */
static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
                      int append)
{
    int buflen;

    /** when the frame data does not need to be concatenated, the input buffer
        is reset and additional bits from the previous frame are copied
        and skipped later so that a fast byte copy is possible */

    if (!append) {
        s->frame_offset = get_bits_count(gb) & 7;
        s->num_saved_bits = s->frame_offset;
        init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
        buflen = (s->num_saved_bits      + len + 7) >> 3;
    } else
        buflen = (put_bits_count(&s->pb) + len + 7) >> 3;

    if (len <= 0 || buflen > MAX_FRAMESIZE) {
        avpriv_request_sample(s->avctx, "Too small input buffer");
        s->packet_loss = 1;
        return;
    }

    av_assert0(len <= put_bits_left(&s->pb));

    s->num_saved_bits += len;
    if (!append) {
        ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3),
                     s->num_saved_bits);
    } else {
        int align = 8 - (get_bits_count(gb) & 7);
        align = FFMIN(align, len);
        put_bits(&s->pb, align, get_bits(gb, align));
        len -= align;
        ff_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len);
    }
    skip_bits_long(gb, len);

    {
        PutBitContext tmp = s->pb;
        flush_put_bits(&tmp);
    }

    init_get_bits(&s->gb, s->frame_data, s->num_saved_bits);
    skip_bits(&s->gb, s->frame_offset);
}

static int decode_packet(AVCodecContext *avctx, WMAProDecodeCtx *s,
                         AVFrame *frame, int *got_frame_ptr, AVPacket *avpkt)