Function tak_parse

libavcodec/tak_parser.c:39–125

} TAKParseContext;

static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx,
                     const uint8_t **poutbuf, int *poutbuf_size,
                     const uint8_t *buf, int buf_size)
{
    TAKParseContext *t = s->priv_data;
    ParseContext *pc   = &t->pc;
    int next           = END_NOT_FOUND;
    GetBitContext gb;
    int consumed = 0;
    int needed   = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8;
    int ret;

    *poutbuf      = buf;
    *poutbuf_size = buf_size;

    if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
        TAKStreamInfo ti;
        if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0)
            return buf_size;
        if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127))
            s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples
                                                   : t->ti.frame_samples;
        return buf_size;
    }

    while (buf_size || t->index + needed <= pc->index) {
        if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) {
            int tmp_buf_size       = FFMIN(TAK_MAX_FRAME_HEADER_BYTES,
                                           buf_size);
            const uint8_t *tmp_buf = buf;

            if (ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size) != -1)
                goto fail;
            consumed += tmp_buf_size;
            buf      += tmp_buf_size;
            buf_size -= tmp_buf_size;
        }

        for (; t->index + needed <= pc->index; t->index++) {
            if (pc->buffer[ t->index     ] == 0xFF &&
                pc->buffer[ t->index + 1 ] == 0xA0) {
                TAKStreamInfo ti;

                if ((ret = init_get_bits8(&gb, pc->buffer + t->index,
                                          pc->index - t->index)) < 0)
                    goto fail;
                if (!ff_tak_decode_frame_header(avctx, &gb,
                        pc->frame_start_found ? &ti : &t->ti, 127) &&
                    !ff_tak_check_crc(pc->buffer + t->index,
                                      get_bits_count(&gb) / 8)) {
                    if (!pc->frame_start_found) {
                        pc->frame_start_found = 1;
                        s->duration           = t->ti.last_frame_samples ?
                                                t->ti.last_frame_samples :
                                                t->ti.frame_samples;
                        s->key_frame          = !!(t->ti.flags & TAK_FRAME_FLAG_HAS_INFO);
                    } else {
                        pc->frame_start_found = 0;