Function decode_frame

libavcodec/wmaprodec.c:1444–1549

*@brief Decode one WMA frame. *@param s codec context *@return 0 if the trailer bit indicates that this is the last frame, * 1 if there are additional frames */

 *        1 if there are additional frames
 */
static int decode_frame(WMAProDecodeCtx *s, AVFrame *frame, int *got_frame_ptr)
{
    GetBitContext* gb = &s->gb;
    int more_frames = 0;
    int len = 0;
    int i;

    /** get frame length */
    if (s->len_prefix)
        len = get_bits(gb, s->log2_frame_size);

    ff_dlog(s->avctx, "decoding frame with length %x\n", len);

    /** decode tile information */
    if (decode_tilehdr(s)) {
        s->packet_loss = 1;
        return 0;
    }

    /** read postproc transform */
    if (s->nb_channels > 1 && get_bits1(gb)) {
        if (get_bits1(gb)) {
            for (i = 0; i < s->nb_channels * s->nb_channels; i++)
                skip_bits(gb, 4);
        }
    }

    /** read drc info */
    if (s->dynamic_range_compression) {
        s->drc_gain = get_bits(gb, 8);
        ff_dlog(s->avctx, "drc_gain %i\n", s->drc_gain);
    }

    if (get_bits1(gb)) {
        if (get_bits1(gb))
            s->trim_start = get_bits(gb, av_log2(s->samples_per_frame * 2));

        if (get_bits1(gb))
            s->trim_end = get_bits(gb, av_log2(s->samples_per_frame * 2));
    } else {
        s->trim_start = s->trim_end = 0;
    }

    ff_dlog(s->avctx, "BITSTREAM: frame header length was %i\n",
            get_bits_count(gb) - s->frame_offset);

    /** reset subframe states */
    s->parsed_all_subframes = 0;
    for (i = 0; i < s->nb_channels; i++) {
        s->channel[i].decoded_samples = 0;
        s->channel[i].cur_subframe    = 0;
        s->channel[i].reuse_sf        = 0;
    }

    /** decode all subframes */
    while (!s->parsed_all_subframes) {
        if (decode_subframe(s) < 0) {
            s->packet_loss = 1;